In the Linux kernel, the following vulnerability has been resolved: configfs: unhash the dentry before dropping the item in rmdir configfs_get_config_item() treats a hashed dentry as proof that sd->s_element is a live config_item. configfs_rmdir() breaks that: simple_rmdir() leaves the dentry hashed, the last reference to the item is dropped right after, and the dentry is only unhashed by d_delete() once ->rmdir() has returned. configfs_symlink() resolves its target holding no lock on it, so get_target() can land in that window: BUG: KASAN: slab-use-after-free in config_item_get+0x26/0x90 get_target fs/configfs/symlink.c:128 [inline] configfs_symlink+0x4ab/0x1030 fs/configfs/symlink.c:185 Unhash in configfs_remove_dir(), while the item is still guaranteed to be there. A reference obtained just before that stays harmless, as create_link() rechecks CONFIGFS_USET_DROPPING, already set by configfs_detach_prep(). Both configfs_unregister_subsystem() paths d_drop() after detaching, so this only makes rmdir match them.
zetlyn/cve-nvd vulnerability cve CVE-2026-97949 known 2026-09-25
https://nvd.nist.gov/vuln/detail/CVE-2026-97949
Properties
| product | Linuxreceipt
What the source handed over{
"cve": {
"affected": [
{
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"programFiles": [
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{
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{
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],
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},
{
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},
{
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"versionType": "semver"
},
{
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{
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"version": "7.3-rc3",
"versionType": "original_commit_for_fix"
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]
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"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nconfigfs: unhash the dentry before dropping the item in rmdir\n\nconfigfs_get_config_item() treats a hashed dentry as proof that\nsd->s_element is a live config_item. configfs_rmdir() breaks that:\nsimple_rmdir() leaves the dentry hashed, the last reference to the item is\ndropped right after, and the dentry is only unhashed by d_delete() once\n->rmdir() has returned. configfs_symlink() resolves its target holding no\nlock on it, so get_target() can land in that window:\n\n BUG: KASAN: slab-use-after-free in config_item_get+0x26/0x90\n get_target fs/configfs/symlink.c:128 [inline]\n configfs_symlink+0x4ab/0x1030 fs/configfs/symlink.c:185\n\nUnhash in configfs_remove_dir(), while the item is still guaranteed to be\nthere. A reference obtained just before that stays harmless, as\ncreate_link() rechecks CONFIGFS_USET_DROPPING, already set by\nconfigfs_detach_prep(). Both configfs_unregister_subsystem() paths\nd_drop() after detaching, so this only makes rmdir match them."
}
],
"id": "CVE-2026-97949",
"lastModified": "2026-09-25T11:17:22.453",
"metrics": {},
"published": "2026-09-25T11:17:22.453",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/5d7cbfb65e47cc71d5d94d87d5d0d1679080f3eb"
},
{
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},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/f06c2d26d1999d37e93299db0ecead04ca7d0b9f"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Received"
}
} | ||||
|---|---|---|---|---|---|
| status | Receivedreceipt
What the source handed over{
"cve": {
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"fs/configfs/dir.c"
],
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"vendor": "Linux",
"versions": [
{
"lessThan": "5d7cbfb65e47cc71d5d94d87d5d0d1679080f3eb",
"status": "affected",
"version": "7063fbf2261194f72ee75afca67b3b38b554b5fa",
"versionType": "git"
},
{
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{
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{
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],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.16"
},
{
"lessThan": "2.6.16",
"status": "unaffected",
"version": "0",
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},
{
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"version": "6.18.53",
"versionType": "semver"
},
{
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"version": "7.2.7",
"versionType": "semver"
},
{
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"version": "7.3-rc3",
"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\nconfigfs: unhash the dentry before dropping the item in rmdir\n\nconfigfs_get_config_item() treats a hashed dentry as proof that\nsd->s_element is a live config_item. configfs_rmdir() breaks that:\nsimple_rmdir() leaves the dentry hashed, the last reference to the item is\ndropped right after, and the dentry is only unhashed by d_delete() once\n->rmdir() has returned. configfs_symlink() resolves its target holding no\nlock on it, so get_target() can land in that window:\n\n BUG: KASAN: slab-use-after-free in config_item_get+0x26/0x90\n get_target fs/configfs/symlink.c:128 [inline]\n configfs_symlink+0x4ab/0x1030 fs/configfs/symlink.c:185\n\nUnhash in configfs_remove_dir(), while the item is still guaranteed to be\nthere. A reference obtained just before that stays harmless, as\ncreate_link() rechecks CONFIGFS_USET_DROPPING, already set by\nconfigfs_detach_prep(). Both configfs_unregister_subsystem() paths\nd_drop() after detaching, so this only makes rmdir match them."
}
],
"id": "CVE-2026-97949",
"lastModified": "2026-09-25T11:17:22.453",
"metrics": {},
"published": "2026-09-25T11:17:22.453",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/5d7cbfb65e47cc71d5d94d87d5d0d1679080f3eb"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/925d8564f1b2d9b46c5ab63b9bc942cea006da9b"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/f06c2d26d1999d37e93299db0ecead04ca7d0b9f"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Received"
}
} | ||||
| vendor | Linuxreceipt
What the source handed over{
"cve": {
"affected": [
{
"affectedData": [
{
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"product": "Linux",
"programFiles": [
"fs/configfs/dir.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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{
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"versionType": "git"
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{
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{
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"version": "2.6.16"
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{
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"status": "unaffected",
"version": "0",
"versionType": "semver"
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{
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"status": "unaffected",
"version": "6.18.53",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "7.2.7",
"versionType": "semver"
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{
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"version": "7.3-rc3",
"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\nconfigfs: unhash the dentry before dropping the item in rmdir\n\nconfigfs_get_config_item() treats a hashed dentry as proof that\nsd->s_element is a live config_item. configfs_rmdir() breaks that:\nsimple_rmdir() leaves the dentry hashed, the last reference to the item is\ndropped right after, and the dentry is only unhashed by d_delete() once\n->rmdir() has returned. configfs_symlink() resolves its target holding no\nlock on it, so get_target() can land in that window:\n\n BUG: KASAN: slab-use-after-free in config_item_get+0x26/0x90\n get_target fs/configfs/symlink.c:128 [inline]\n configfs_symlink+0x4ab/0x1030 fs/configfs/symlink.c:185\n\nUnhash in configfs_remove_dir(), while the item is still guaranteed to be\nthere. A reference obtained just before that stays harmless, as\ncreate_link() rechecks CONFIGFS_USET_DROPPING, already set by\nconfigfs_detach_prep(). Both configfs_unregister_subsystem() paths\nd_drop() after detaching, so this only makes rmdir match them."
}
],
"id": "CVE-2026-97949",
"lastModified": "2026-09-25T11:17:22.453",
"metrics": {},
"published": "2026-09-25T11:17:22.453",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/5d7cbfb65e47cc71d5d94d87d5d0d1679080f3eb"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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},
{
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"url": "https://git.kernel.org/stable/c/f06c2d26d1999d37e93299db0ecead04ca7d0b9f"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Received"
}
} |
Text
In the Linux kernel, the following vulnerability has been resolved:
configfs: unhash the dentry before dropping the item in rmdir
configfs_get_config_item() treats a hashed dentry as proof that
sd->s_element is a live config_item. configfs_rmdir() breaks that:
simple_rmdir() leaves the dentry hashed, the last reference to the item is
dropped right after, and the dentry is only unhashed by d_delete() once
->rmdir() has returned. configfs_symlink() resolves its target holding no
lock on it, so get_target() can land in that window:
BUG: KASAN: slab-use-after-free in config_item_get+0x26/0x90
get_target fs/configfs/symlink.c:128 [inline]
configfs_symlink+0x4ab/0x1030 fs/configfs/symlink.c:185
Unhash in configfs_remove_dir(), while the item is still guaranteed to be
there. A reference obtained just before that stays harmless, as
create_link() rechecks CONFIGFS_USET_DROPPING, already set by
configfs_detach_prep(). Both configfs_unregister_subsystem() paths
d_drop() after detaching, so this only makes rmdir match them.