kernel: Linux kernel Bluetooth: Denial of Service due to use-after-free in connection handling

cve CVE-2023-53762 2 sources, 2 claims · Watch

Red Hat writes:
kernel: Linux kernel Bluetooth: Denial of Service due to use-after-free in connection handling the claim

What it is to other things

In words only, so not counted until a person confirms one:

affectslinux/linux
NVD says “Linux · Linux”
made_bylinux
NVD says “Linux”

What each source says

PropertySourceSaidMeans here
Cvss
cvss
conflict		NVD8.8
receipt
Source
NVD
Its words
8.8
Read by
field:cve.metrics.cvssMetricV31[].cvssData.baseScore
Said since
2026-10-03 12:09 UTC
Last answered
2026-10-04 06:13 UTC
Original
open at the source
What the source handed over
{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "defaultStatus": "unaffected",
            "product": "Linux",
            "programFiles": [
              "net/bluetooth/hci_sync.c"
            ],
            "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
            "vendor": "Linux",
            "versions": [
              {
                "lessThan": "5e3ee972f185eb7957ce789b3bf13a3cb790f178",
                "status": "affected",
                "version": "182ee45da083db4e3e621541ccf255bfa9652214",
                "versionType": "git"
              },
              {
                "lessThan": "a30c074f0b5b7f909a15c978fbc96a29e2f94e42",
                "status": "affected",
                "version": "182ee45da083db4e3e621541ccf255bfa9652214",
                "versionType": "git"
              },
              {
                "lessThan": "ba3ba53ce1f76fc372b8f918fece4f9b1e41acd4",
                "status": "affected",
                "version": "182ee45da083db4e3e621541ccf255bfa9652214",
                "versionType": "git"
              },
              {
                "lessThan": "94d9ba9f9888b748d4abd2aa1547af56ae85f772",
                "status": "affected",
                "version": "182ee45da083db4e3e621541ccf255bfa9652214",
                "versionType": "git"
              }
            ]
          },
          {
            "defaultStatus": "affected",
            "product": "Linux",
            "programFiles": [
              "net/bluetooth/hci_sync.c"
            ],
            "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
            "vendor": "Linux",
            "versions": [
              {
                "status": "affected",
                "version": "5.17"
              },
              {
                "lessThan": "5.17",
                "status": "unaffected",
                "version": "0",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "6.1.*",
                "status": "unaffected",
                "version": "6.1.189",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "6.4.*",
                "status": "unaffected",
                "version": "6.4.16",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "6.5.*",
                "status": "unaffected",
                "version": "6.5.3",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "*",
                "status": "unaffected",
                "version": "6.6",
                "versionType": "original_commit_for_fix"
              }
            ]
          }
        ],
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_sync: Fix UAF in hci_disconnect_all_sync\n\nUse-after-free can occur in hci_disconnect_all_sync if a connection is\ndeleted by concurrent processing of a controller event.\n\nTo prevent this the code now tries to iterate over the list backwards\nto ensure the links are cleanup before its parents, also it no longer\nrelies on a cursor, instead it always uses the last element since\nhci_abort_conn_sync is guaranteed to call hci_conn_del.\n\nUAF crash log:\n==================================================================\nBUG: KASAN: slab-use-after-free in hci_set_powered_sync\n(net/bluetooth/hci_sync.c:5424) [bluetooth]\nRead of size 8 at addr ffff888009d9c000 by task kworker/u9:0/124\n\nCPU: 0 PID: 124 Comm: kworker/u9:0 Tainted: G        W\n6.5.0-rc1+ #10\nHardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS\n1.16.2-1.fc38 04/01/2014\nWorkqueue: hci0 hci_cmd_sync_work [bluetooth]\nCall Trace:\n <TASK>\n dump_stack_lvl+0x5b/0x90\n print_report+0xcf/0x670\n ? __virt_addr_valid+0xdd/0x160\n ? hci_set_powered_sync+0x2c9/0x4a0 [bluetooth]\n kasan_report+0xa6/0xe0\n ? hci_set_powered_sync+0x2c9/0x4a0 [bluetooth]\n ? __pfx_set_powered_sync+0x10/0x10 [bluetooth]\n hci_set_powered_sync+0x2c9/0x4a0 [bluetooth]\n ? __pfx_hci_set_powered_sync+0x10/0x10 [bluetooth]\n ? __pfx_lock_release+0x10/0x10\n ? __pfx_set_powered_sync+0x10/0x10 [bluetooth]\n hci_cmd_sync_work+0x137/0x220 [bluetooth]\n process_one_work+0x526/0x9d0\n ? __pfx_process_one_work+0x10/0x10\n ? __pfx_do_raw_spin_lock+0x10/0x10\n ? mark_held_locks+0x1a/0x90\n worker_thread+0x92/0x630\n ? __pfx_worker_thread+0x10/0x10\n kthread+0x196/0x1e0\n ? __pfx_kthread+0x10/0x10\n ret_from_fork+0x2c/0x50\n </TASK>\n\nAllocated by task 1782:\n kasan_save_stack+0x33/0x60\n kasan_set_track+0x25/0x30\n __kasan_kmalloc+0x8f/0xa0\n hci_conn_add+0xa5/0xa80 [bluetooth]\n hci_bind_cis+0x881/0x9b0 [bluetooth]\n iso_connect_cis+0x121/0x520 [bluetooth]\n iso_sock_connect+0x3f6/0x790 [bluetooth]\n __sys_connect+0x109/0x130\n __x64_sys_connect+0x40/0x50\n do_syscall_64+0x60/0x90\n entry_SYSCALL_64_after_hwframe+0x6e/0xd8\n\nFreed by task 695:\n kasan_save_stack+0x33/0x60\n kasan_set_track+0x25/0x30\n kasan_save_free_info+0x2b/0x50\n __kasan_slab_free+0x10a/0x180\n __kmem_cache_free+0x14d/0x2e0\n device_release+0x5d/0xf0\n kobject_put+0xdf/0x270\n hci_disconn_complete_evt+0x274/0x3a0 [bluetooth]\n hci_event_packet+0x579/0x7e0 [bluetooth]\n hci_rx_work+0x287/0xaa0 [bluetooth]\n process_one_work+0x526/0x9d0\n worker_thread+0x92/0x630\n kthread+0x196/0x1e0\n ret_from_fork+0x2c/0x50\n=================================================================="
      }
    ],
    "id": "CVE-2023-53762",
    "lastModified": "2026-10-03T11:17:28.767",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "LOW",
            "attackVector": "ADJACENT_NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "exploitabilityScore": 2.8,
          "impactScore": 5.9,
          "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
            "id": "CVE-2023-53762",
            "options": [
              {
                "exploitation": "none"
              },
              {
                "automatable": "no"
              },
              {
                "technicalImpact": "partial"
              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-06-16T15:46:42.482426Z",
            "version": "2.0.3"
          }
        }
      ]
    },
    "published": "2025-12-08T02:15:52.043",
    "references": [
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/5e3ee972f185eb7957ce789b3bf13a3cb790f178"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/94d9ba9f9888b748d4abd2aa1547af56ae85f772"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/a30c074f0b5b7f909a15c978fbc96a29e2f94e42"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/ba3ba53ce1f76fc372b8f918fece4f9b1e41acd4"
      }
    ],
    "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "vulnStatus": "Deferred"
  }
}
—
Cvss
cvss
conflict		Red Hat7
receipt
Source
Red Hat
Its words
7.0
Read by
field:cvss3_score
Said since
2026-09-29 09:44 UTC
Last answered
2026-10-04 06:13 UTC
Original
open at the source
What the source handed over
{
  "CVE": "CVE-2023-53762",
  "CWE": "CWE-825",
  "advisories": [
    "RHSA-2026:2821",
    "RHSA-2026:2720",
    "RHSA-2026:3358",
    "RHSA-2024:2394",
    "RHSA-2026:3267"
  ],
  "affected_packages": [
    "kernel-0:5.14.0-427.13.1.el9_4",
    "kernel-0:5.14.0-284.158.1.el9_2",
    "kernel-rt-0:5.14.0-284.158.1.rt14.443.el9_2",
    "kernel-0:4.18.0-553.105.1.el8_10",
    "kernel-rt-0:4.18.0-553.105.1.rt7.446.el8_10"
  ],
  "bugzilla": "2419838",
  "bugzilla_description": "kernel: Linux kernel Bluetooth: Denial of Service due to use-after-free in connection handling",
  "cvss3_score": "7.0",
  "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
  "cvss_score": null,
  "cvss_scoring_vector": null,
  "package_state": null,
  "public_date": "2025-12-08T00:00:00Z",
  "resource_url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2023-53762.json",
  "severity": "moderate"
}
—
Cwe
cwe
Red HatCWE-825
receipt
Source
Red Hat
Its words
CWE-825
Read by
field:CWE
Said since
2026-09-29 09:44 UTC
Last answered
2026-10-04 06:13 UTC
Original
open at the source
What the source handed over
{
  "CVE": "CVE-2023-53762",
  "CWE": "CWE-825",
  "advisories": [
    "RHSA-2026:2821",
    "RHSA-2026:2720",
    "RHSA-2026:3358",
    "RHSA-2024:2394",
    "RHSA-2026:3267"
  ],
  "affected_packages": [
    "kernel-0:5.14.0-427.13.1.el9_4",
    "kernel-0:5.14.0-284.158.1.el9_2",
    "kernel-rt-0:5.14.0-284.158.1.rt14.443.el9_2",
    "kernel-0:4.18.0-553.105.1.el8_10",
    "kernel-rt-0:4.18.0-553.105.1.rt7.446.el8_10"
  ],
  "bugzilla": "2419838",
  "bugzilla_description": "kernel: Linux kernel Bluetooth: Denial of Service due to use-after-free in connection handling",
  "cvss3_score": "7.0",
  "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
  "cvss_score": null,
  "cvss_scoring_vector": null,
  "package_state": null,
  "public_date": "2025-12-08T00:00:00Z",
  "resource_url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2023-53762.json",
  "severity": "moderate"
}
—
Packages
packages
Red Hatkernel-0:5.14.0-427.13.1.el9_4, kernel-0:5.14.0-284.158.1.el9_2, kernel-rt-0:5.14.0-284.158.1.rt14.443.el9_2, kernel-0:4.18.0-553.105.1.el8_10, kernel-rt-0:4.18.0-553.105.1.rt7.446.el8_10
receipt
Source
Red Hat
Its words
kernel-0:5.14.0-427.13.1.el9_4, kernel-0:5.14.0-284.158.1.el9_2, kernel-rt-0:5.14.0-284.158.1.rt14.443.el9_2, kernel-0:4.18.0-553.105.1.el8_10, kernel-rt-0:4.18.0-553.105.1.rt7.446.el8_10
Read by
field:affected_packages[]
Said since
2026-09-29 09:44 UTC
Last answered
2026-10-04 06:13 UTC
Original
open at the source
What the source handed over
{
  "CVE": "CVE-2023-53762",
  "CWE": "CWE-825",
  "advisories": [
    "RHSA-2026:2821",
    "RHSA-2026:2720",
    "RHSA-2026:3358",
    "RHSA-2024:2394",
    "RHSA-2026:3267"
  ],
  "affected_packages": [
    "kernel-0:5.14.0-427.13.1.el9_4",
    "kernel-0:5.14.0-284.158.1.el9_2",
    "kernel-rt-0:5.14.0-284.158.1.rt14.443.el9_2",
    "kernel-0:4.18.0-553.105.1.el8_10",
    "kernel-rt-0:4.18.0-553.105.1.rt7.446.el8_10"
  ],
  "bugzilla": "2419838",
  "bugzilla_description": "kernel: Linux kernel Bluetooth: Denial of Service due to use-after-free in connection handling",
  "cvss3_score": "7.0",
  "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
  "cvss_score": null,
  "cvss_scoring_vector": null,
  "package_state": null,
  "public_date": "2025-12-08T00:00:00Z",
  "resource_url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2023-53762.json",
  "severity": "moderate"
}
—
Product
product
NVDLinux
receipt
Source
NVD
Its words
Linux
Read by
field:cve.affected[].affectedData[].product
Said since
2026-10-03 12:09 UTC
Last answered
2026-10-04 06:13 UTC
Original
open at the source
What the source handed over
{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "defaultStatus": "unaffected",
            "product": "Linux",
            "programFiles": [
              "net/bluetooth/hci_sync.c"
            ],
            "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
            "vendor": "Linux",
            "versions": [
              {
                "lessThan": "5e3ee972f185eb7957ce789b3bf13a3cb790f178",
                "status": "affected",
                "version": "182ee45da083db4e3e621541ccf255bfa9652214",
                "versionType": "git"
              },
              {
                "lessThan": "a30c074f0b5b7f909a15c978fbc96a29e2f94e42",
                "status": "affected",
                "version": "182ee45da083db4e3e621541ccf255bfa9652214",
                "versionType": "git"
              },
              {
                "lessThan": "ba3ba53ce1f76fc372b8f918fece4f9b1e41acd4",
                "status": "affected",
                "version": "182ee45da083db4e3e621541ccf255bfa9652214",
                "versionType": "git"
              },
              {
                "lessThan": "94d9ba9f9888b748d4abd2aa1547af56ae85f772",
                "status": "affected",
                "version": "182ee45da083db4e3e621541ccf255bfa9652214",
                "versionType": "git"
              }
            ]
          },
          {
            "defaultStatus": "affected",
            "product": "Linux",
            "programFiles": [
              "net/bluetooth/hci_sync.c"
            ],
            "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
            "vendor": "Linux",
            "versions": [
              {
                "status": "affected",
                "version": "5.17"
              },
              {
                "lessThan": "5.17",
                "status": "unaffected",
                "version": "0",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "6.1.*",
                "status": "unaffected",
                "version": "6.1.189",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "6.4.*",
                "status": "unaffected",
                "version": "6.4.16",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "6.5.*",
                "status": "unaffected",
                "version": "6.5.3",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "*",
                "status": "unaffected",
                "version": "6.6",
                "versionType": "original_commit_for_fix"
              }
            ]
          }
        ],
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_sync: Fix UAF in hci_disconnect_all_sync\n\nUse-after-free can occur in hci_disconnect_all_sync if a connection is\ndeleted by concurrent processing of a controller event.\n\nTo prevent this the code now tries to iterate over the list backwards\nto ensure the links are cleanup before its parents, also it no longer\nrelies on a cursor, instead it always uses the last element since\nhci_abort_conn_sync is guaranteed to call hci_conn_del.\n\nUAF crash log:\n==================================================================\nBUG: KASAN: slab-use-after-free in hci_set_powered_sync\n(net/bluetooth/hci_sync.c:5424) [bluetooth]\nRead of size 8 at addr ffff888009d9c000 by task kworker/u9:0/124\n\nCPU: 0 PID: 124 Comm: kworker/u9:0 Tainted: G        W\n6.5.0-rc1+ #10\nHardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS\n1.16.2-1.fc38 04/01/2014\nWorkqueue: hci0 hci_cmd_sync_work [bluetooth]\nCall Trace:\n <TASK>\n dump_stack_lvl+0x5b/0x90\n print_report+0xcf/0x670\n ? __virt_addr_valid+0xdd/0x160\n ? hci_set_powered_sync+0x2c9/0x4a0 [bluetooth]\n kasan_report+0xa6/0xe0\n ? hci_set_powered_sync+0x2c9/0x4a0 [bluetooth]\n ? __pfx_set_powered_sync+0x10/0x10 [bluetooth]\n hci_set_powered_sync+0x2c9/0x4a0 [bluetooth]\n ? __pfx_hci_set_powered_sync+0x10/0x10 [bluetooth]\n ? __pfx_lock_release+0x10/0x10\n ? __pfx_set_powered_sync+0x10/0x10 [bluetooth]\n hci_cmd_sync_work+0x137/0x220 [bluetooth]\n process_one_work+0x526/0x9d0\n ? __pfx_process_one_work+0x10/0x10\n ? __pfx_do_raw_spin_lock+0x10/0x10\n ? mark_held_locks+0x1a/0x90\n worker_thread+0x92/0x630\n ? __pfx_worker_thread+0x10/0x10\n kthread+0x196/0x1e0\n ? __pfx_kthread+0x10/0x10\n ret_from_fork+0x2c/0x50\n </TASK>\n\nAllocated by task 1782:\n kasan_save_stack+0x33/0x60\n kasan_set_track+0x25/0x30\n __kasan_kmalloc+0x8f/0xa0\n hci_conn_add+0xa5/0xa80 [bluetooth]\n hci_bind_cis+0x881/0x9b0 [bluetooth]\n iso_connect_cis+0x121/0x520 [bluetooth]\n iso_sock_connect+0x3f6/0x790 [bluetooth]\n __sys_connect+0x109/0x130\n __x64_sys_connect+0x40/0x50\n do_syscall_64+0x60/0x90\n entry_SYSCALL_64_after_hwframe+0x6e/0xd8\n\nFreed by task 695:\n kasan_save_stack+0x33/0x60\n kasan_set_track+0x25/0x30\n kasan_save_free_info+0x2b/0x50\n __kasan_slab_free+0x10a/0x180\n __kmem_cache_free+0x14d/0x2e0\n device_release+0x5d/0xf0\n kobject_put+0xdf/0x270\n hci_disconn_complete_evt+0x274/0x3a0 [bluetooth]\n hci_event_packet+0x579/0x7e0 [bluetooth]\n hci_rx_work+0x287/0xaa0 [bluetooth]\n process_one_work+0x526/0x9d0\n worker_thread+0x92/0x630\n kthread+0x196/0x1e0\n ret_from_fork+0x2c/0x50\n=================================================================="
      }
    ],
    "id": "CVE-2023-53762",
    "lastModified": "2026-10-03T11:17:28.767",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "LOW",
            "attackVector": "ADJACENT_NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "exploitabilityScore": 2.8,
          "impactScore": 5.9,
          "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
            "id": "CVE-2023-53762",
            "options": [
              {
                "exploitation": "none"
              },
              {
                "automatable": "no"
              },
              {
                "technicalImpact": "partial"
              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-06-16T15:46:42.482426Z",
            "version": "2.0.3"
          }
        }
      ]
    },
    "published": "2025-12-08T02:15:52.043",
    "references": [
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/5e3ee972f185eb7957ce789b3bf13a3cb790f178"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/94d9ba9f9888b748d4abd2aa1547af56ae85f772"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/a30c074f0b5b7f909a15c978fbc96a29e2f94e42"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/ba3ba53ce1f76fc372b8f918fece4f9b1e41acd4"
      }
    ],
    "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "vulnStatus": "Deferred"
  }
}
—
Severity
severity
Red Hatmoderate
A flaw that is harder to exploit, or whose impact is limited.
receipt
Source
Red Hat
Its words
moderate
Read by
field:severity
Said since
2026-09-29 09:44 UTC
Last answered
2026-10-04 06:13 UTC
Original
open at the source
What the source handed over
{
  "CVE": "CVE-2023-53762",
  "CWE": "CWE-825",
  "advisories": [
    "RHSA-2026:2821",
    "RHSA-2026:2720",
    "RHSA-2026:3358",
    "RHSA-2024:2394",
    "RHSA-2026:3267"
  ],
  "affected_packages": [
    "kernel-0:5.14.0-427.13.1.el9_4",
    "kernel-0:5.14.0-284.158.1.el9_2",
    "kernel-rt-0:5.14.0-284.158.1.rt14.443.el9_2",
    "kernel-0:4.18.0-553.105.1.el8_10",
    "kernel-rt-0:4.18.0-553.105.1.rt7.446.el8_10"
  ],
  "bugzilla": "2419838",
  "bugzilla_description": "kernel: Linux kernel Bluetooth: Denial of Service due to use-after-free in connection handling",
  "cvss3_score": "7.0",
  "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
  "cvss_score": null,
  "cvss_scoring_vector": null,
  "package_state": null,
  "public_date": "2025-12-08T00:00:00Z",
  "resource_url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2023-53762.json",
  "severity": "moderate"
}
medium
Status
status
NVDDeferred
receipt
Source
NVD
Its words
Deferred
Read by
field:cve.vulnStatus
Said since
2026-10-03 12:09 UTC
Last answered
2026-10-04 06:13 UTC
Original
open at the source
What the source handed over
{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "defaultStatus": "unaffected",
            "product": "Linux",
            "programFiles": [
              "net/bluetooth/hci_sync.c"
            ],
            "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
            "vendor": "Linux",
            "versions": [
              {
                "lessThan": "5e3ee972f185eb7957ce789b3bf13a3cb790f178",
                "status": "affected",
                "version": "182ee45da083db4e3e621541ccf255bfa9652214",
                "versionType": "git"
              },
              {
                "lessThan": "a30c074f0b5b7f909a15c978fbc96a29e2f94e42",
                "status": "affected",
                "version": "182ee45da083db4e3e621541ccf255bfa9652214",
                "versionType": "git"
              },
              {
                "lessThan": "ba3ba53ce1f76fc372b8f918fece4f9b1e41acd4",
                "status": "affected",
                "version": "182ee45da083db4e3e621541ccf255bfa9652214",
                "versionType": "git"
              },
              {
                "lessThan": "94d9ba9f9888b748d4abd2aa1547af56ae85f772",
                "status": "affected",
                "version": "182ee45da083db4e3e621541ccf255bfa9652214",
                "versionType": "git"
              }
            ]
          },
          {
            "defaultStatus": "affected",
            "product": "Linux",
            "programFiles": [
              "net/bluetooth/hci_sync.c"
            ],
            "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
            "vendor": "Linux",
            "versions": [
              {
                "status": "affected",
                "version": "5.17"
              },
              {
                "lessThan": "5.17",
                "status": "unaffected",
                "version": "0",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "6.1.*",
                "status": "unaffected",
                "version": "6.1.189",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "6.4.*",
                "status": "unaffected",
                "version": "6.4.16",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "6.5.*",
                "status": "unaffected",
                "version": "6.5.3",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "*",
                "status": "unaffected",
                "version": "6.6",
                "versionType": "original_commit_for_fix"
              }
            ]
          }
        ],
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_sync: Fix UAF in hci_disconnect_all_sync\n\nUse-after-free can occur in hci_disconnect_all_sync if a connection is\ndeleted by concurrent processing of a controller event.\n\nTo prevent this the code now tries to iterate over the list backwards\nto ensure the links are cleanup before its parents, also it no longer\nrelies on a cursor, instead it always uses the last element since\nhci_abort_conn_sync is guaranteed to call hci_conn_del.\n\nUAF crash log:\n==================================================================\nBUG: KASAN: slab-use-after-free in hci_set_powered_sync\n(net/bluetooth/hci_sync.c:5424) [bluetooth]\nRead of size 8 at addr ffff888009d9c000 by task kworker/u9:0/124\n\nCPU: 0 PID: 124 Comm: kworker/u9:0 Tainted: G        W\n6.5.0-rc1+ #10\nHardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS\n1.16.2-1.fc38 04/01/2014\nWorkqueue: hci0 hci_cmd_sync_work [bluetooth]\nCall Trace:\n <TASK>\n dump_stack_lvl+0x5b/0x90\n print_report+0xcf/0x670\n ? __virt_addr_valid+0xdd/0x160\n ? hci_set_powered_sync+0x2c9/0x4a0 [bluetooth]\n kasan_report+0xa6/0xe0\n ? hci_set_powered_sync+0x2c9/0x4a0 [bluetooth]\n ? __pfx_set_powered_sync+0x10/0x10 [bluetooth]\n hci_set_powered_sync+0x2c9/0x4a0 [bluetooth]\n ? __pfx_hci_set_powered_sync+0x10/0x10 [bluetooth]\n ? __pfx_lock_release+0x10/0x10\n ? __pfx_set_powered_sync+0x10/0x10 [bluetooth]\n hci_cmd_sync_work+0x137/0x220 [bluetooth]\n process_one_work+0x526/0x9d0\n ? __pfx_process_one_work+0x10/0x10\n ? __pfx_do_raw_spin_lock+0x10/0x10\n ? mark_held_locks+0x1a/0x90\n worker_thread+0x92/0x630\n ? __pfx_worker_thread+0x10/0x10\n kthread+0x196/0x1e0\n ? __pfx_kthread+0x10/0x10\n ret_from_fork+0x2c/0x50\n </TASK>\n\nAllocated by task 1782:\n kasan_save_stack+0x33/0x60\n kasan_set_track+0x25/0x30\n __kasan_kmalloc+0x8f/0xa0\n hci_conn_add+0xa5/0xa80 [bluetooth]\n hci_bind_cis+0x881/0x9b0 [bluetooth]\n iso_connect_cis+0x121/0x520 [bluetooth]\n iso_sock_connect+0x3f6/0x790 [bluetooth]\n __sys_connect+0x109/0x130\n __x64_sys_connect+0x40/0x50\n do_syscall_64+0x60/0x90\n entry_SYSCALL_64_after_hwframe+0x6e/0xd8\n\nFreed by task 695:\n kasan_save_stack+0x33/0x60\n kasan_set_track+0x25/0x30\n kasan_save_free_info+0x2b/0x50\n __kasan_slab_free+0x10a/0x180\n __kmem_cache_free+0x14d/0x2e0\n device_release+0x5d/0xf0\n kobject_put+0xdf/0x270\n hci_disconn_complete_evt+0x274/0x3a0 [bluetooth]\n hci_event_packet+0x579/0x7e0 [bluetooth]\n hci_rx_work+0x287/0xaa0 [bluetooth]\n process_one_work+0x526/0x9d0\n worker_thread+0x92/0x630\n kthread+0x196/0x1e0\n ret_from_fork+0x2c/0x50\n=================================================================="
      }
    ],
    "id": "CVE-2023-53762",
    "lastModified": "2026-10-03T11:17:28.767",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "LOW",
            "attackVector": "ADJACENT_NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "exploitabilityScore": 2.8,
          "impactScore": 5.9,
          "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
            "id": "CVE-2023-53762",
            "options": [
              {
                "exploitation": "none"
              },
              {
                "automatable": "no"
              },
              {
                "technicalImpact": "partial"
              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-06-16T15:46:42.482426Z",
            "version": "2.0.3"
          }
        }
      ]
    },
    "published": "2025-12-08T02:15:52.043",
    "references": [
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/5e3ee972f185eb7957ce789b3bf13a3cb790f178"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/94d9ba9f9888b748d4abd2aa1547af56ae85f772"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/a30c074f0b5b7f909a15c978fbc96a29e2f94e42"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/ba3ba53ce1f76fc372b8f918fece4f9b1e41acd4"
      }
    ],
    "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "vulnStatus": "Deferred"
  }
}
—
Vendor
vendor
NVDLinux
receipt
Source
NVD
Its words
Linux
Read by
field:cve.affected[].affectedData[].vendor
Said since
2026-10-03 12:09 UTC
Last answered
2026-10-04 06:13 UTC
Original
open at the source
What the source handed over
{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "defaultStatus": "unaffected",
            "product": "Linux",
            "programFiles": [
              "net/bluetooth/hci_sync.c"
            ],
            "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
            "vendor": "Linux",
            "versions": [
              {
                "lessThan": "5e3ee972f185eb7957ce789b3bf13a3cb790f178",
                "status": "affected",
                "version": "182ee45da083db4e3e621541ccf255bfa9652214",
                "versionType": "git"
              },
              {
                "lessThan": "a30c074f0b5b7f909a15c978fbc96a29e2f94e42",
                "status": "affected",
                "version": "182ee45da083db4e3e621541ccf255bfa9652214",
                "versionType": "git"
              },
              {
                "lessThan": "ba3ba53ce1f76fc372b8f918fece4f9b1e41acd4",
                "status": "affected",
                "version": "182ee45da083db4e3e621541ccf255bfa9652214",
                "versionType": "git"
              },
              {
                "lessThan": "94d9ba9f9888b748d4abd2aa1547af56ae85f772",
                "status": "affected",
                "version": "182ee45da083db4e3e621541ccf255bfa9652214",
                "versionType": "git"
              }
            ]
          },
          {
            "defaultStatus": "affected",
            "product": "Linux",
            "programFiles": [
              "net/bluetooth/hci_sync.c"
            ],
            "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
            "vendor": "Linux",
            "versions": [
              {
                "status": "affected",
                "version": "5.17"
              },
              {
                "lessThan": "5.17",
                "status": "unaffected",
                "version": "0",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "6.1.*",
                "status": "unaffected",
                "version": "6.1.189",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "6.4.*",
                "status": "unaffected",
                "version": "6.4.16",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "6.5.*",
                "status": "unaffected",
                "version": "6.5.3",
                "versionType": "semver"
              },
              {
                "lessThanOrEqual": "*",
                "status": "unaffected",
                "version": "6.6",
                "versionType": "original_commit_for_fix"
              }
            ]
          }
        ],
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_sync: Fix UAF in hci_disconnect_all_sync\n\nUse-after-free can occur in hci_disconnect_all_sync if a connection is\ndeleted by concurrent processing of a controller event.\n\nTo prevent this the code now tries to iterate over the list backwards\nto ensure the links are cleanup before its parents, also it no longer\nrelies on a cursor, instead it always uses the last element since\nhci_abort_conn_sync is guaranteed to call hci_conn_del.\n\nUAF crash log:\n==================================================================\nBUG: KASAN: slab-use-after-free in hci_set_powered_sync\n(net/bluetooth/hci_sync.c:5424) [bluetooth]\nRead of size 8 at addr ffff888009d9c000 by task kworker/u9:0/124\n\nCPU: 0 PID: 124 Comm: kworker/u9:0 Tainted: G        W\n6.5.0-rc1+ #10\nHardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS\n1.16.2-1.fc38 04/01/2014\nWorkqueue: hci0 hci_cmd_sync_work [bluetooth]\nCall Trace:\n <TASK>\n dump_stack_lvl+0x5b/0x90\n print_report+0xcf/0x670\n ? __virt_addr_valid+0xdd/0x160\n ? hci_set_powered_sync+0x2c9/0x4a0 [bluetooth]\n kasan_report+0xa6/0xe0\n ? hci_set_powered_sync+0x2c9/0x4a0 [bluetooth]\n ? __pfx_set_powered_sync+0x10/0x10 [bluetooth]\n hci_set_powered_sync+0x2c9/0x4a0 [bluetooth]\n ? __pfx_hci_set_powered_sync+0x10/0x10 [bluetooth]\n ? __pfx_lock_release+0x10/0x10\n ? __pfx_set_powered_sync+0x10/0x10 [bluetooth]\n hci_cmd_sync_work+0x137/0x220 [bluetooth]\n process_one_work+0x526/0x9d0\n ? __pfx_process_one_work+0x10/0x10\n ? __pfx_do_raw_spin_lock+0x10/0x10\n ? mark_held_locks+0x1a/0x90\n worker_thread+0x92/0x630\n ? __pfx_worker_thread+0x10/0x10\n kthread+0x196/0x1e0\n ? __pfx_kthread+0x10/0x10\n ret_from_fork+0x2c/0x50\n </TASK>\n\nAllocated by task 1782:\n kasan_save_stack+0x33/0x60\n kasan_set_track+0x25/0x30\n __kasan_kmalloc+0x8f/0xa0\n hci_conn_add+0xa5/0xa80 [bluetooth]\n hci_bind_cis+0x881/0x9b0 [bluetooth]\n iso_connect_cis+0x121/0x520 [bluetooth]\n iso_sock_connect+0x3f6/0x790 [bluetooth]\n __sys_connect+0x109/0x130\n __x64_sys_connect+0x40/0x50\n do_syscall_64+0x60/0x90\n entry_SYSCALL_64_after_hwframe+0x6e/0xd8\n\nFreed by task 695:\n kasan_save_stack+0x33/0x60\n kasan_set_track+0x25/0x30\n kasan_save_free_info+0x2b/0x50\n __kasan_slab_free+0x10a/0x180\n __kmem_cache_free+0x14d/0x2e0\n device_release+0x5d/0xf0\n kobject_put+0xdf/0x270\n hci_disconn_complete_evt+0x274/0x3a0 [bluetooth]\n hci_event_packet+0x579/0x7e0 [bluetooth]\n hci_rx_work+0x287/0xaa0 [bluetooth]\n process_one_work+0x526/0x9d0\n worker_thread+0x92/0x630\n kthread+0x196/0x1e0\n ret_from_fork+0x2c/0x50\n=================================================================="
      }
    ],
    "id": "CVE-2023-53762",
    "lastModified": "2026-10-03T11:17:28.767",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "LOW",
            "attackVector": "ADJACENT_NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "exploitabilityScore": 2.8,
          "impactScore": 5.9,
          "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
            "id": "CVE-2023-53762",
            "options": [
              {
                "exploitation": "none"
              },
              {
                "automatable": "no"
              },
              {
                "technicalImpact": "partial"
              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-06-16T15:46:42.482426Z",
            "version": "2.0.3"
          }
        }
      ]
    },
    "published": "2025-12-08T02:15:52.043",
    "references": [
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/5e3ee972f185eb7957ce789b3bf13a3cb790f178"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/94d9ba9f9888b748d4abd2aa1547af56ae85f772"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/a30c074f0b5b7f909a15c978fbc96a29e2f94e42"
      },
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "url": "https://git.kernel.org/stable/c/ba3ba53ce1f76fc372b8f918fece4f9b1e41acd4"
      }
    ],
    "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "vulnStatus": "Deferred"
  }
}
—

vulnerability

kernel: Linux kernel Bluetooth: Denial of Service due to use-after-free in connection handling
zetlyn/cve-redhat · 2025-12-08
cvss 7 cwe CWE-825 packages kernel-0:5.14.0-427.13.1.el9_4, kernel-0:5.14.0-284.158.1.el9_2, kernel-rt-0:5.14.0-284.158.1.rt14.443.el9_2, kernel-0:4.18.0-553.105.1.el8_10, kernel-rt-0:4.18.0-553.105.1.rt7.446.el8_10 severity moderate source
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_sync: Fix UAF in hci_disconnect_all_sync Use-after-free can occur in hci_disconnect_all_sync if a connection is deleted by concurrent processing of a controller event. To prevent this the code now tries to iterate over the list backwards to ensure the links are cleanup before its parents, also it no longer relies on a cursor, instead it always uses the last element since hci_abort_conn_sync is guaranteed to call hci_conn_del. UAF crash log: ================================================================== BUG: KASAN: slab-use-after-free in hci_set_powered_sync (net/bluetooth/hci_sync.c:5424) [bluetooth] Read of size 8 at addr ffff888009d9c000 by task kworker/u9:0/124 CPU: 0 PID: 124 Comm: kworker/u9:0 Tainted: G W 6.5.0-rc1+ #10 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-1.fc38 04/01/2014 Workqueue: hci0 hci_cmd_sync_work [bluetooth] Call Trace: <TASK> dump_stack_lvl+0x5b/0x90 print_report+0xcf/0x670 ? __virt_addr_valid+0xdd/0x160 ? hci_set_powered_sync+0x2c9/0x4a0 [bluetooth] kasan_report+0xa6/0xe0 ? hci_set_powered_sync+0x2c9/0x4a0 [bluetooth] ? __pfx_set_powered_sync+0x10/0x10 [bluetooth] hci_set_powered_sync+0x2c9/0x4a0 [bluetooth] ? __pfx_hci_set_powered_sync+0x10/0x10 [bluetooth] ? __pfx_lock_release+0x10/0x10 ? __pfx_set_powered_sync+0x10/0x10 [bluetooth] hci_cmd_sync_work+0x137/0x220 [bluetooth] process_one_work+0x526/0x9d0 ? __pfx_process_one_work+0x10/0x10 ? __pfx_do_raw_spin_lock+0x10/0x10 ? mark_held_locks+0x1a/0x90 worker_thread+0x92/0x630 ? __pfx_worker_thread+0x10/0x10 kthread+0x196/0x1e0 ? __pfx_kthread+0x10/0x10 ret_from_fork+0x2c/0x50 </TASK> Allocated by task 1782: kasan_save_stack+0x33/0x60 kasan_set_track+0x25/0x30 __kasan_kmalloc+0x8f/0xa0 hci_conn_add+0xa5/0xa80 [bluetooth] hci_bind_cis+0x881/0x9b0 [bluetooth] iso_connect_cis+0x121/0x520 [bluetooth] iso_sock_connect+0x3f6/0x790 [bluetooth] __sys_connect+0x109/0x130 __x64_sys_connect+0x40/0x50 do_syscall_64+0x60/0x90 entry_SYSCALL_64_after_hwframe+0x6e/0xd8 Freed by task 695: kasan_save_stack+0x33/0x60 kasan_set_track+0x25/0x30 kasan_save_free_info+0x2b/0x50 __kasan_slab_free+0x10a/0x180 __kmem_cache_free+0x14d/0x2e0 device_release+0x5d/0xf0 kobject_put+0xdf/0x270 hci_disconn_complete_evt+0x274/0x3a0 [bluetooth] hci_event_packet+0x579/0x7e0 [bluetooth] hci_rx_work+0x287/0xaa0 [bluetooth] process_one_work+0x526/0x9d0 worker_thread+0x92/0x630 kthread+0x196/0x1e0 ret_from_fork+0x2c/0x50 ==================================================================
zetlyn/cve-nvd · 2025-12-08
cvss 8.8 product Linux status Deferred vendor Linux source