CVE-2026-97949 (GCVE-0-2026-97949)
Vulnerability from cvelistv5 – Published: 2026-09-25 10:22 – Updated: 2026-10-19 09:11
VLAI
EPSS
VEX
Title
configfs: unhash the dentry before dropping the item in rmdir
Summary
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.
Severity
No CVSS data available.
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
7063fbf2261194f72ee75afca67b3b38b554b5fa , < 446720051d44eebaa81b33969173160057b73a33
(git)
Affected: 7063fbf2261194f72ee75afca67b3b38b554b5fa , < 5d7cbfb65e47cc71d5d94d87d5d0d1679080f3eb (git) Affected: 7063fbf2261194f72ee75afca67b3b38b554b5fa , < 925d8564f1b2d9b46c5ab63b9bc942cea006da9b (git) Affected: 7063fbf2261194f72ee75afca67b3b38b554b5fa , < f06c2d26d1999d37e93299db0ecead04ca7d0b9f (git) |
guessed | |
| Linux | Linux |
Affected:
2.6.16
Unaffected: 0 , < 2.6.16 (semver) Unaffected: 6.12.112 , ≤ 6.12.* (semver) Unaffected: 6.18.53 , ≤ 6.18.* (semver) Unaffected: 7.2.7 , ≤ 7.2.* (semver) Unaffected: 7.3 , ≤ * (original_commit_for_fix) |
guessed |
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"fs/configfs/dir.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "446720051d44eebaa81b33969173160057b73a33",
"status": "affected",
"version": "7063fbf2261194f72ee75afca67b3b38b554b5fa",
"versionType": "git"
},
{
"lessThan": "5d7cbfb65e47cc71d5d94d87d5d0d1679080f3eb",
"status": "affected",
"version": "7063fbf2261194f72ee75afca67b3b38b554b5fa",
"versionType": "git"
},
{
"lessThan": "925d8564f1b2d9b46c5ab63b9bc942cea006da9b",
"status": "affected",
"version": "7063fbf2261194f72ee75afca67b3b38b554b5fa",
"versionType": "git"
},
{
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"status": "affected",
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"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"fs/configfs/dir.c"
],
"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",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.112",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.53",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.2.*",
"status": "unaffected",
"version": "7.2.7",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.112",
"versionStartIncluding": "2.6.16",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.53",
"versionStartIncluding": "2.6.16",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.2.7",
"versionStartIncluding": "2.6.16",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.3",
"versionStartIncluding": "2.6.16",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"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-\u003es_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-\u003ermdir() 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."
}
],
"providerMetadata": {
"dateUpdated": "2026-10-19T09:11:15.552Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/446720051d44eebaa81b33969173160057b73a33"
},
{
"url": "https://git.kernel.org/stable/c/5d7cbfb65e47cc71d5d94d87d5d0d1679080f3eb"
},
{
"url": "https://git.kernel.org/stable/c/925d8564f1b2d9b46c5ab63b9bc942cea006da9b"
},
{
"url": "https://git.kernel.org/stable/c/f06c2d26d1999d37e93299db0ecead04ca7d0b9f"
}
],
"title": "configfs: unhash the dentry before dropping the item in rmdir",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-97949",
"datePublished": "2026-09-25T10:22:58.375Z",
"dateReserved": "2026-09-25T10:18:58.205Z",
"dateUpdated": "2026-10-19T09:11:15.552Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-97949",
"date": "2026-10-20",
"epss": "0.00168",
"percentile": "0.05665"
},
"microsoft_vex": {
"current_release_date": "2026-09-27T23:16:10.000Z",
"cve": "CVE-2026-97949",
"id": "msrc_CVE-2026-97949",
"initial_release_date": "2026-09-27T23:16:10.000Z",
"product_status:known_affected": "1",
"source": "Microsoft CSAF VEX",
"status": "final",
"title": "configfs: unhash the dentry before dropping the item in rmdir",
"url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-97949.json",
"version": "1"
},
"nvd": {
"cve": {
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"fs/configfs/dir.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "446720051d44eebaa81b33969173160057b73a33",
"status": "affected",
"version": "7063fbf2261194f72ee75afca67b3b38b554b5fa",
"versionType": "git"
},
{
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"status": "affected",
"version": "7063fbf2261194f72ee75afca67b3b38b554b5fa",
"versionType": "git"
},
{
"lessThan": "925d8564f1b2d9b46c5ab63b9bc942cea006da9b",
"status": "affected",
"version": "7063fbf2261194f72ee75afca67b3b38b554b5fa",
"versionType": "git"
},
{
"lessThan": "f06c2d26d1999d37e93299db0ecead04ca7d0b9f",
"status": "affected",
"version": "7063fbf2261194f72ee75afca67b3b38b554b5fa",
"versionType": "git"
}
]
},
{
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"product": "Linux",
"programFiles": [
"fs/configfs/dir.c"
],
"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",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.112",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.53",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.2.*",
"status": "unaffected",
"version": "7.2.7",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.3",
"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-\u003es_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-\u003ermdir() 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": "2026-10-19T10:17:46.147",
"metrics": {},
"published": "2026-09-25T11:17:22.453",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/446720051d44eebaa81b33969173160057b73a33"
},
{
"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"
}
},
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-09-30T04:21:16+00:00",
"cve": "CVE-2026-97949",
"id": "CVE-2026-97949",
"initial_release_date": "2026-09-25T00:00:00+00:00",
"product_status:known_affected": "276",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: configfs: unhash the dentry before dropping the item in rmdir",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-97949.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-10-09T16:58:45Z",
"cve": "CVE-2026-97949",
"id": "CVE-2026-97949",
"initial_release_date": "2026-09-29T23:44:17Z",
"product_status:known_affected": "347",
"product_status:recommended": "4",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2026-97949",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-97949.json",
"version": "3"
}
}
}
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