configfs: unhash the dentry before dropping the item in rmdir
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.
CVE-2026-97949
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-97949
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "7063fbf2261194f72ee75afca67b3b38b554b5fa",
"lessThan": "b315d865660766d45ecdbf7433a4e3d36a554b3b",
"versionType": "git"
},
{
"status": "affected",
"version": "7063fbf2261194f72ee75afca67b3b38b554b5fa",
"lessThan": "446720051d44eebaa81b33969173160057b73a33",
"versionType": "git"
},
{
"status": "affected",
"version": "7063fbf2261194f72ee75afca67b3b38b554b5fa",
"lessThan": "5d7cbfb65e47cc71d5d94d87d5d0d1679080f3eb",
"versionType": "git"
},
{
"status": "affected",
"version": "7063fbf2261194f72ee75afca67b3b38b554b5fa",
"lessThan": "925d8564f1b2d9b46c5ab63b9bc942cea006da9b",
"versionType": "git"
},
{
"status": "affected",
"version": "7063fbf2261194f72ee75afca67b3b38b554b5fa",
"lessThan": "f06c2d26d1999d37e93299db0ecead04ca7d0b9f",
"versionType": "git"
}
],
"programFiles": [
"fs/configfs/dir.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.16"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "2.6.16",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.160",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.112",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.53",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.7",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"fs/configfs/dir.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-97949
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #48813 · Revision 1
- Added to Heist Feed
- Publisher date