In the Linux kernel, the following vulnerability has been resolved: ipv6: mcast: extend RCU protection in igmp6_send() igmp6_send() can be called without RTNL or RCU being held. Extend RCU protection so that we can safely fetch the net pointer and avoid a potential UAF. Note that we no longer can use sock_alloc_send_skb() because ipv6.igmp_sk uses GFP_KERNEL allocations which can sleep. Instead use alloc_skb() and charge the net->ipv6.igmp_sk socket under RCU protection.

zetlyn/cve-nvd vulnerability cve CVE-2025-21759 cpe cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* cpe cpe:2.3:o:linux:linux_kernel:6.14:rc1:*:*:*:*:*:* cpe cpe:2.3:o:linux:linux_kernel:6.14:rc2:*:*:*:*:*:* known 2025-02-27

https://nvd.nist.gov/vuln/detail/CVE-2025-21759

Properties

cvss	7.8 receipt Source NVD Its words `7.8` Read by `field:cve.metrics.cvssMetricV31[].cvssData.baseScore` Said since 2026-10-03 12:09 UTC Last answered 2026-10-05 12:24 UTC Original open at the source What the source handed over { "cve": { "affected": [ { "affectedData": [ { "defaultStatus": "unaffected", "product": "Linux", "programFiles": [ "net/ipv6/mcast.c" ], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [ { "lessThan": "638e8fe3563a82f298fe537a28d5342a97278cf1", "status": "affected", "version": "b8ad0cbc58f703972e9e37c4e2a8081dd7e6a551", "versionType": "git" }, { "lessThan": "6901bbb169e3add6c037218d996790cef6b3d650", "status": "affected", "version": "b8ad0cbc58f703972e9e37c4e2a8081dd7e6a551", "versionType": "git" }, { "lessThan": "7e0a818ecc4d62e7fb668ea02de0bfe8ba0b7dff", "status": "affected", "version": "b8ad0cbc58f703972e9e37c4e2a8081dd7e6a551", "versionType": "git" }, { "lessThan": "81b25a07ebf53f9ef4ca8f3d96a8ddb94561dd5a", "status": "affected", "version": "b8ad0cbc58f703972e9e37c4e2a8081dd7e6a551", "versionType": "git" }, { "lessThan": "0bf8e2f3768629d437a32cb824149e6e98254381", "status": "affected", "version": "b8ad0cbc58f703972e9e37c4e2a8081dd7e6a551", "versionType": "git" }, { "lessThan": "8e92d6a413feaf968a33f0b439ecf27404407458", "status": "affected", "version": "b8ad0cbc58f703972e9e37c4e2a8081dd7e6a551", "versionType": "git" }, { "lessThan": "087c1faa594fa07a66933d750c0b2610aa1a2946", "status": "affected", "version": "b8ad0cbc58f703972e9e37c4e2a8081dd7e6a551", "versionType": "git" } ] }, { "defaultStatus": "affected", "product": "Linux", "programFiles": [ "net/ipv6/mcast.c" ], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [ { "status": "affected", "version": "2.6.26" }, { "lessThan": "2.6.26", "status": "unaffected", "version": "0", "versionType": "semver" }, { "lessThanOrEqual": "5.10.", "status": "unaffected", "version": "5.10.271", "versionType": "semver" }, { "lessThanOrEqual": "5.15.", "status": "unaffected", "version": "5.15.222", "versionType": "semver" }, { "lessThanOrEqual": "6.1.", "status": "unaffected", "version": "6.1.189", "versionType": "semver" }, { "lessThanOrEqual": "6.6.", "status": "unaffected", "version": "6.6.79", "versionType": "semver" }, { "lessThanOrEqual": "6.12.", "status": "unaffected", "version": "6.12.16", "versionType": "semver" }, { "lessThanOrEqual": "6.13.", "status": "unaffected", "version": "6.13.4", "versionType": "semver" }, { "lessThanOrEqual": "", "status": "unaffected", "version": "6.14", "versionType": "original_commit_for_fix" } ] } ], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67" } ], "configurations": [ { "nodes": [ { "cpeMatch": [ { "criteria": "cpe:2.3:o:linux:linux_kernel::::::::", "matchCriteriaId": "80691BA5-295B-4772-9338-1D31A39548D6", "versionEndExcluding": "6.6.79", "versionStartIncluding": "2.6.26", "vulnerable": true }, { "criteria": "cpe:2.3:o:linux:linux_kernel::::::::", "matchCriteriaId": "13C8DB18-FC60-425F-84E5-3EDDEC61B2FC", "versionEndExcluding": "6.12.16", "versionStartIncluding": "6.7", "vulnerable": true }, { "criteria": "cpe:2.3:o:linux:linux_kernel::::::::", "matchCriteriaId": "2A2093ED-74A9-43F9-AC72-50030F374EA4", "versionEndExcluding": "6.13.4", "versionStartIncluding": "6.13", "vulnerable": true }, { "criteria": "cpe:2.3:o:linux:linux_kernel:6.14:rc1::::::", "matchCriteriaId": "186716B6-2B66-4BD0-852E-D48E71C0C85F", "vulnerable": true }, { "criteria": "cpe:2.3:o:linux:linux_kernel:6.14:rc2::::::*", "matchCriteriaId": "0D3E781C-403A-498F-9DA9-ECEE50F41E75", "vulnerable": true } ], "negate": false, "operator": "OR" } ] } ], "cveTags": [], "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: mcast: extend RCU protection in igmp6_send()\n\nigmp6_send() can be called without RTNL or RCU being held.\n\nExtend RCU protection so that we can safely fetch the net pointer\nand avoid a potential UAF.\n\nNote that we no longer can use sock_alloc_send_skb() because\nipv6.igmp_sk uses GFP_KERNEL allocations which can sleep.\n\nInstead use alloc_skb() and charge the net->ipv6.igmp_sk\nsocket under RCU protection." }, { "lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ipv6: mcast: extender la protección RCU en igmp6_send() igmp6_send() se puede llamar sin que se mantenga RTNL o RCU. Extienda la protección RCU para que podamos obtener de forma segura el puntero de red y evitar un posible UAF. Tenga en cuenta que ya no podemos usar sock_alloc_send_skb() porque ipv6.igmp_sk usa asignaciones GFP_KERNEL que pueden dormir. En su lugar, use alloc_skb() y cargue el socket net->ipv6.igmp_sk bajo la protección RCU." } ], "id": "CVE-2025-21759", "lastModified": "2026-10-03T11:17:32.400", "metrics": { "cvssMetricV31": [ { "cvssData": { "attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1" }, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary" }, { "cvssData": { "attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1" }, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary" } ], "ssvcV203": [ { "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": { "id": "CVE-2025-21759", "options": [ { "exploitation": "none" }, { "automatable": "no" }, { "technicalImpact": "total" } ], "role": "CISA Coordinator", "timestamp": "2025-02-27T17:57:46.460072Z", "version": "2.0.3" } } ] }, "published": "2025-02-27T03:15:16.550", "references": [ { "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": [ "Patch" ], "url": "https://git.kernel.org/stable/c/087c1faa594fa07a66933d750c0b2610aa1a2946" }, { "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": [ "Patch" ], "url": "https://git.kernel.org/stable/c/0bf8e2f3768629d437a32cb824149e6e98254381" }, { "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/638e8fe3563a82f298fe537a28d5342a97278cf1" }, { "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/6901bbb169e3add6c037218d996790cef6b3d650" }, { "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/7e0a818ecc4d62e7fb668ea02de0bfe8ba0b7dff" }, { "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": [ "Patch" ], "url": "https://git.kernel.org/stable/c/81b25a07ebf53f9ef4ca8f3d96a8ddb94561dd5a" }, { "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": [ "Patch" ], "url": "https://git.kernel.org/stable/c/8e92d6a413feaf968a33f0b439ecf27404407458" } ], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [ { "description": [ { "lang": "en", "value": "CWE-416" } ], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary" } ] } }
product	Linux receipt Source NVD Its words `Linux` Read by `field:cve.affected[].affectedData[].product` Said since 2026-10-03 12:09 UTC Last answered 2026-10-05 12:24 UTC Original open at the source What the source handed over { "cve": { "affected": [ { "affectedData": [ { "defaultStatus": "unaffected", "product": "Linux", "programFiles": [ "net/ipv6/mcast.c" ], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [ { "lessThan": "638e8fe3563a82f298fe537a28d5342a97278cf1", "status": "affected", "version": "b8ad0cbc58f703972e9e37c4e2a8081dd7e6a551", "versionType": "git" }, { "lessThan": "6901bbb169e3add6c037218d996790cef6b3d650", "status": "affected", "version": "b8ad0cbc58f703972e9e37c4e2a8081dd7e6a551", "versionType": "git" }, { "lessThan": "7e0a818ecc4d62e7fb668ea02de0bfe8ba0b7dff", "status": "affected", "version": "b8ad0cbc58f703972e9e37c4e2a8081dd7e6a551", "versionType": "git" }, { "lessThan": "81b25a07ebf53f9ef4ca8f3d96a8ddb94561dd5a", "status": "affected", "version": "b8ad0cbc58f703972e9e37c4e2a8081dd7e6a551", "versionType": "git" }, { "lessThan": "0bf8e2f3768629d437a32cb824149e6e98254381", "status": "affected", "version": "b8ad0cbc58f703972e9e37c4e2a8081dd7e6a551", "versionType": "git" }, { "lessThan": "8e92d6a413feaf968a33f0b439ecf27404407458", "status": "affected", "version": "b8ad0cbc58f703972e9e37c4e2a8081dd7e6a551", "versionType": "git" }, { "lessThan": "087c1faa594fa07a66933d750c0b2610aa1a2946", "status": "affected", "version": "b8ad0cbc58f703972e9e37c4e2a8081dd7e6a551", "versionType": "git" } ] }, { "defaultStatus": "affected", "product": "Linux", "programFiles": [ "net/ipv6/mcast.c" ], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [ { "status": "affected", "version": "2.6.26" }, { "lessThan": "2.6.26", "status": "unaffected", "version": "0", "versionType": "semver" }, { "lessThanOrEqual": "5.10.", "status": "unaffected", "version": "5.10.271", "versionType": "semver" }, { "lessThanOrEqual": "5.15.", "status": "unaffected", "version": "5.15.222", "versionType": "semver" }, { "lessThanOrEqual": "6.1.", "status": "unaffected", "version": "6.1.189", "versionType": "semver" }, { "lessThanOrEqual": "6.6.", "status": "unaffected", "version": "6.6.79", "versionType": "semver" }, { "lessThanOrEqual": "6.12.", "status": "unaffected", "version": "6.12.16", "versionType": "semver" }, { "lessThanOrEqual": "6.13.", "status": "unaffected", "version": "6.13.4", "versionType": "semver" }, { "lessThanOrEqual": "", "status": "unaffected", "version": "6.14", "versionType": "original_commit_for_fix" } ] } ], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67" } ], "configurations": [ { "nodes": [ { "cpeMatch": [ { "criteria": "cpe:2.3:o:linux:linux_kernel::::::::", "matchCriteriaId": "80691BA5-295B-4772-9338-1D31A39548D6", "versionEndExcluding": "6.6.79", "versionStartIncluding": "2.6.26", "vulnerable": true }, { "criteria": "cpe:2.3:o:linux:linux_kernel::::::::", "matchCriteriaId": "13C8DB18-FC60-425F-84E5-3EDDEC61B2FC", "versionEndExcluding": "6.12.16", "versionStartIncluding": "6.7", "vulnerable": true }, { "criteria": "cpe:2.3:o:linux:linux_kernel::::::::", "matchCriteriaId": "2A2093ED-74A9-43F9-AC72-50030F374EA4", "versionEndExcluding": "6.13.4", "versionStartIncluding": "6.13", "vulnerable": true }, { "criteria": "cpe:2.3:o:linux:linux_kernel:6.14:rc1::::::", "matchCriteriaId": "186716B6-2B66-4BD0-852E-D48E71C0C85F", "vulnerable": true }, { "criteria": "cpe:2.3:o:linux:linux_kernel:6.14:rc2::::::*", "matchCriteriaId": "0D3E781C-403A-498F-9DA9-ECEE50F41E75", "vulnerable": true } ], "negate": false, "operator": "OR" } ] } ], "cveTags": [], "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: mcast: extend RCU protection in igmp6_send()\n\nigmp6_send() can be called without RTNL or RCU being held.\n\nExtend RCU protection so that we can safely fetch the net pointer\nand avoid a potential UAF.\n\nNote that we no longer can use sock_alloc_send_skb() because\nipv6.igmp_sk uses GFP_KERNEL allocations which can sleep.\n\nInstead use alloc_skb() and charge the net->ipv6.igmp_sk\nsocket under RCU protection." }, { "lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ipv6: mcast: extender la protección RCU en igmp6_send() igmp6_send() se puede llamar sin que se mantenga RTNL o RCU. Extienda la protección RCU para que podamos obtener de forma segura el puntero de red y evitar un posible UAF. Tenga en cuenta que ya no podemos usar sock_alloc_send_skb() porque ipv6.igmp_sk usa asignaciones GFP_KERNEL que pueden dormir. En su lugar, use alloc_skb() y cargue el socket net->ipv6.igmp_sk bajo la protección RCU." } ], "id": "CVE-2025-21759", "lastModified": "2026-10-03T11:17:32.400", "metrics": { "cvssMetricV31": [ { "cvssData": { "attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1" }, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary" }, { "cvssData": { "attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1" }, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary" } ], "ssvcV203": [ { "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": { "id": "CVE-2025-21759", "options": [ { "exploitation": "none" }, { "automatable": "no" }, { "technicalImpact": "total" } ], "role": "CISA Coordinator", "timestamp": "2025-02-27T17:57:46.460072Z", "version": "2.0.3" } } ] }, "published": "2025-02-27T03:15:16.550", "references": [ { "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": [ "Patch" ], "url": "https://git.kernel.org/stable/c/087c1faa594fa07a66933d750c0b2610aa1a2946" }, { "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": [ "Patch" ], "url": "https://git.kernel.org/stable/c/0bf8e2f3768629d437a32cb824149e6e98254381" }, { "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/638e8fe3563a82f298fe537a28d5342a97278cf1" }, { "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/6901bbb169e3add6c037218d996790cef6b3d650" }, { "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/7e0a818ecc4d62e7fb668ea02de0bfe8ba0b7dff" }, { "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": [ "Patch" ], "url": "https://git.kernel.org/stable/c/81b25a07ebf53f9ef4ca8f3d96a8ddb94561dd5a" }, { "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": [ "Patch" ], "url": "https://git.kernel.org/stable/c/8e92d6a413feaf968a33f0b439ecf27404407458" } ], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [ { "description": [ { "lang": "en", "value": "CWE-416" } ], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary" } ] } }
status	Modified receipt Source NVD Its words `Modified` Read by `field:cve.vulnStatus` Said since 2026-10-03 12:09 UTC Last answered 2026-10-05 12:24 UTC Original open at the source What the source handed over { "cve": { "affected": [ { "affectedData": [ { "defaultStatus": "unaffected", "product": "Linux", "programFiles": [ "net/ipv6/mcast.c" ], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [ { "lessThan": "638e8fe3563a82f298fe537a28d5342a97278cf1", "status": "affected", "version": "b8ad0cbc58f703972e9e37c4e2a8081dd7e6a551", "versionType": "git" }, { "lessThan": "6901bbb169e3add6c037218d996790cef6b3d650", "status": "affected", "version": "b8ad0cbc58f703972e9e37c4e2a8081dd7e6a551", "versionType": "git" }, { "lessThan": "7e0a818ecc4d62e7fb668ea02de0bfe8ba0b7dff", "status": "affected", "version": "b8ad0cbc58f703972e9e37c4e2a8081dd7e6a551", "versionType": "git" }, { "lessThan": "81b25a07ebf53f9ef4ca8f3d96a8ddb94561dd5a", "status": "affected", "version": "b8ad0cbc58f703972e9e37c4e2a8081dd7e6a551", "versionType": "git" }, { "lessThan": "0bf8e2f3768629d437a32cb824149e6e98254381", "status": "affected", "version": "b8ad0cbc58f703972e9e37c4e2a8081dd7e6a551", "versionType": "git" }, { "lessThan": "8e92d6a413feaf968a33f0b439ecf27404407458", "status": "affected", "version": "b8ad0cbc58f703972e9e37c4e2a8081dd7e6a551", "versionType": "git" }, { "lessThan": "087c1faa594fa07a66933d750c0b2610aa1a2946", "status": "affected", "version": "b8ad0cbc58f703972e9e37c4e2a8081dd7e6a551", "versionType": "git" } ] }, { "defaultStatus": "affected", "product": "Linux", "programFiles": [ "net/ipv6/mcast.c" ], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [ { "status": "affected", "version": "2.6.26" }, { "lessThan": "2.6.26", "status": "unaffected", "version": "0", "versionType": "semver" }, { "lessThanOrEqual": "5.10.", "status": "unaffected", "version": "5.10.271", "versionType": "semver" }, { "lessThanOrEqual": "5.15.", "status": "unaffected", "version": "5.15.222", "versionType": "semver" }, { "lessThanOrEqual": "6.1.", "status": "unaffected", "version": "6.1.189", "versionType": "semver" }, { "lessThanOrEqual": "6.6.", "status": "unaffected", "version": "6.6.79", "versionType": "semver" }, { "lessThanOrEqual": "6.12.", "status": "unaffected", "version": "6.12.16", "versionType": "semver" }, { "lessThanOrEqual": "6.13.", "status": "unaffected", "version": "6.13.4", "versionType": "semver" }, { "lessThanOrEqual": "", "status": "unaffected", "version": "6.14", "versionType": "original_commit_for_fix" } ] } ], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67" } ], "configurations": [ { "nodes": [ { "cpeMatch": [ { "criteria": "cpe:2.3:o:linux:linux_kernel::::::::", "matchCriteriaId": "80691BA5-295B-4772-9338-1D31A39548D6", "versionEndExcluding": "6.6.79", "versionStartIncluding": "2.6.26", "vulnerable": true }, { "criteria": "cpe:2.3:o:linux:linux_kernel::::::::", "matchCriteriaId": "13C8DB18-FC60-425F-84E5-3EDDEC61B2FC", "versionEndExcluding": "6.12.16", "versionStartIncluding": "6.7", "vulnerable": true }, { "criteria": "cpe:2.3:o:linux:linux_kernel::::::::", "matchCriteriaId": "2A2093ED-74A9-43F9-AC72-50030F374EA4", "versionEndExcluding": "6.13.4", "versionStartIncluding": "6.13", "vulnerable": true }, { "criteria": "cpe:2.3:o:linux:linux_kernel:6.14:rc1::::::", "matchCriteriaId": "186716B6-2B66-4BD0-852E-D48E71C0C85F", "vulnerable": true }, { "criteria": "cpe:2.3:o:linux:linux_kernel:6.14:rc2::::::*", "matchCriteriaId": "0D3E781C-403A-498F-9DA9-ECEE50F41E75", "vulnerable": true } ], "negate": false, "operator": "OR" } ] } ], "cveTags": [], "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: mcast: extend RCU protection in igmp6_send()\n\nigmp6_send() can be called without RTNL or RCU being held.\n\nExtend RCU protection so that we can safely fetch the net pointer\nand avoid a potential UAF.\n\nNote that we no longer can use sock_alloc_send_skb() because\nipv6.igmp_sk uses GFP_KERNEL allocations which can sleep.\n\nInstead use alloc_skb() and charge the net->ipv6.igmp_sk\nsocket under RCU protection." }, { "lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ipv6: mcast: extender la protección RCU en igmp6_send() igmp6_send() se puede llamar sin que se mantenga RTNL o RCU. Extienda la protección RCU para que podamos obtener de forma segura el puntero de red y evitar un posible UAF. Tenga en cuenta que ya no podemos usar sock_alloc_send_skb() porque ipv6.igmp_sk usa asignaciones GFP_KERNEL que pueden dormir. En su lugar, use alloc_skb() y cargue el socket net->ipv6.igmp_sk bajo la protección RCU." } ], "id": "CVE-2025-21759", "lastModified": "2026-10-03T11:17:32.400", "metrics": { "cvssMetricV31": [ { "cvssData": { "attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1" }, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary" }, { "cvssData": { "attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1" }, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary" } ], "ssvcV203": [ { "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": { "id": "CVE-2025-21759", "options": [ { "exploitation": "none" }, { "automatable": "no" }, { "technicalImpact": "total" } ], "role": "CISA Coordinator", "timestamp": "2025-02-27T17:57:46.460072Z", "version": "2.0.3" } } ] }, "published": "2025-02-27T03:15:16.550", "references": [ { "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": [ "Patch" ], "url": "https://git.kernel.org/stable/c/087c1faa594fa07a66933d750c0b2610aa1a2946" }, { "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": [ "Patch" ], "url": "https://git.kernel.org/stable/c/0bf8e2f3768629d437a32cb824149e6e98254381" }, { "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/638e8fe3563a82f298fe537a28d5342a97278cf1" }, { "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/6901bbb169e3add6c037218d996790cef6b3d650" }, { "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/7e0a818ecc4d62e7fb668ea02de0bfe8ba0b7dff" }, { "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": [ "Patch" ], "url": "https://git.kernel.org/stable/c/81b25a07ebf53f9ef4ca8f3d96a8ddb94561dd5a" }, { "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": [ "Patch" ], "url": "https://git.kernel.org/stable/c/8e92d6a413feaf968a33f0b439ecf27404407458" } ], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [ { "description": [ { "lang": "en", "value": "CWE-416" } ], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary" } ] } }
vendor	Linux receipt Source NVD Its words `Linux` Read by `field:cve.affected[].affectedData[].vendor` Said since 2026-10-03 12:09 UTC Last answered 2026-10-05 12:24 UTC Original open at the source What the source handed over { "cve": { "affected": [ { "affectedData": [ { "defaultStatus": "unaffected", "product": "Linux", "programFiles": [ "net/ipv6/mcast.c" ], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [ { "lessThan": "638e8fe3563a82f298fe537a28d5342a97278cf1", "status": "affected", "version": "b8ad0cbc58f703972e9e37c4e2a8081dd7e6a551", "versionType": "git" }, { "lessThan": "6901bbb169e3add6c037218d996790cef6b3d650", "status": "affected", "version": "b8ad0cbc58f703972e9e37c4e2a8081dd7e6a551", "versionType": "git" }, { "lessThan": "7e0a818ecc4d62e7fb668ea02de0bfe8ba0b7dff", "status": "affected", "version": "b8ad0cbc58f703972e9e37c4e2a8081dd7e6a551", "versionType": "git" }, { "lessThan": "81b25a07ebf53f9ef4ca8f3d96a8ddb94561dd5a", "status": "affected", "version": "b8ad0cbc58f703972e9e37c4e2a8081dd7e6a551", "versionType": "git" }, { "lessThan": "0bf8e2f3768629d437a32cb824149e6e98254381", "status": "affected", "version": "b8ad0cbc58f703972e9e37c4e2a8081dd7e6a551", "versionType": "git" }, { "lessThan": "8e92d6a413feaf968a33f0b439ecf27404407458", "status": "affected", "version": "b8ad0cbc58f703972e9e37c4e2a8081dd7e6a551", "versionType": "git" }, { "lessThan": "087c1faa594fa07a66933d750c0b2610aa1a2946", "status": "affected", "version": "b8ad0cbc58f703972e9e37c4e2a8081dd7e6a551", "versionType": "git" } ] }, { "defaultStatus": "affected", "product": "Linux", "programFiles": [ "net/ipv6/mcast.c" ], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [ { "status": "affected", "version": "2.6.26" }, { "lessThan": "2.6.26", "status": "unaffected", "version": "0", "versionType": "semver" }, { "lessThanOrEqual": "5.10.", "status": "unaffected", "version": "5.10.271", "versionType": "semver" }, { "lessThanOrEqual": "5.15.", "status": "unaffected", "version": "5.15.222", "versionType": "semver" }, { "lessThanOrEqual": "6.1.", "status": "unaffected", "version": "6.1.189", "versionType": "semver" }, { "lessThanOrEqual": "6.6.", "status": "unaffected", "version": "6.6.79", "versionType": "semver" }, { "lessThanOrEqual": "6.12.", "status": "unaffected", "version": "6.12.16", "versionType": "semver" }, { "lessThanOrEqual": "6.13.", "status": "unaffected", "version": "6.13.4", "versionType": "semver" }, { "lessThanOrEqual": "", "status": "unaffected", "version": "6.14", "versionType": "original_commit_for_fix" } ] } ], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67" } ], "configurations": [ { "nodes": [ { "cpeMatch": [ { "criteria": "cpe:2.3:o:linux:linux_kernel::::::::", "matchCriteriaId": "80691BA5-295B-4772-9338-1D31A39548D6", "versionEndExcluding": "6.6.79", "versionStartIncluding": "2.6.26", "vulnerable": true }, { "criteria": "cpe:2.3:o:linux:linux_kernel::::::::", "matchCriteriaId": "13C8DB18-FC60-425F-84E5-3EDDEC61B2FC", "versionEndExcluding": "6.12.16", "versionStartIncluding": "6.7", "vulnerable": true }, { "criteria": "cpe:2.3:o:linux:linux_kernel::::::::", "matchCriteriaId": "2A2093ED-74A9-43F9-AC72-50030F374EA4", "versionEndExcluding": "6.13.4", "versionStartIncluding": "6.13", "vulnerable": true }, { "criteria": "cpe:2.3:o:linux:linux_kernel:6.14:rc1::::::", "matchCriteriaId": "186716B6-2B66-4BD0-852E-D48E71C0C85F", "vulnerable": true }, { "criteria": "cpe:2.3:o:linux:linux_kernel:6.14:rc2::::::*", "matchCriteriaId": "0D3E781C-403A-498F-9DA9-ECEE50F41E75", "vulnerable": true } ], "negate": false, "operator": "OR" } ] } ], "cveTags": [], "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: mcast: extend RCU protection in igmp6_send()\n\nigmp6_send() can be called without RTNL or RCU being held.\n\nExtend RCU protection so that we can safely fetch the net pointer\nand avoid a potential UAF.\n\nNote that we no longer can use sock_alloc_send_skb() because\nipv6.igmp_sk uses GFP_KERNEL allocations which can sleep.\n\nInstead use alloc_skb() and charge the net->ipv6.igmp_sk\nsocket under RCU protection." }, { "lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ipv6: mcast: extender la protección RCU en igmp6_send() igmp6_send() se puede llamar sin que se mantenga RTNL o RCU. Extienda la protección RCU para que podamos obtener de forma segura el puntero de red y evitar un posible UAF. Tenga en cuenta que ya no podemos usar sock_alloc_send_skb() porque ipv6.igmp_sk usa asignaciones GFP_KERNEL que pueden dormir. En su lugar, use alloc_skb() y cargue el socket net->ipv6.igmp_sk bajo la protección RCU." } ], "id": "CVE-2025-21759", "lastModified": "2026-10-03T11:17:32.400", "metrics": { "cvssMetricV31": [ { "cvssData": { "attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1" }, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary" }, { "cvssData": { "attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1" }, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary" } ], "ssvcV203": [ { "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": { "id": "CVE-2025-21759", "options": [ { "exploitation": "none" }, { "automatable": "no" }, { "technicalImpact": "total" } ], "role": "CISA Coordinator", "timestamp": "2025-02-27T17:57:46.460072Z", "version": "2.0.3" } } ] }, "published": "2025-02-27T03:15:16.550", "references": [ { "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": [ "Patch" ], "url": "https://git.kernel.org/stable/c/087c1faa594fa07a66933d750c0b2610aa1a2946" }, { "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": [ "Patch" ], "url": "https://git.kernel.org/stable/c/0bf8e2f3768629d437a32cb824149e6e98254381" }, { "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/638e8fe3563a82f298fe537a28d5342a97278cf1" }, { "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/6901bbb169e3add6c037218d996790cef6b3d650" }, { "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/7e0a818ecc4d62e7fb668ea02de0bfe8ba0b7dff" }, { "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": [ "Patch" ], "url": "https://git.kernel.org/stable/c/81b25a07ebf53f9ef4ca8f3d96a8ddb94561dd5a" }, { "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": [ "Patch" ], "url": "https://git.kernel.org/stable/c/8e92d6a413feaf968a33f0b439ecf27404407458" } ], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [ { "description": [ { "lang": "en", "value": "CWE-416" } ], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary" } ] } }

Text

In the Linux kernel, the following vulnerability has been resolved: ipv6: mcast: extend RCU protection in igmp6_send() igmp6_send() can be called without RTNL or RCU being held. Extend RCU protection so that we can safely fetch the net pointer and avoid a potential UAF. Note that we no longer can use sock_alloc_send_skb() because ipv6.igmp_sk uses GFP_KERNEL allocations which can sleep. Instead use alloc_skb() and charge the net->ipv6.igmp_sk socket under RCU protection. En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ipv6: mcast: extender la protección RCU en igmp6_send() igmp6_send() se puede llamar sin que se mantenga RTNL o RCU. Extienda la protección RCU para que podamos obtener de forma segura el puntero de red y evitar un posible UAF. Tenga en cuenta que ya no podemos usar sock_alloc_send_skb() porque ipv6.igmp_sk usa asignaciones GFP_KERNEL que pueden dormir. En su lugar, use alloc_skb() y cargue el socket net->ipv6.igmp_sk bajo la protección RCU.