configfs_lookup(): don't leave ->s_dentry dangling on failure
In the Linux kernel, the following vulnerability has been resolved: configfs_lookup(): don't leave ->s_dentry dangling on failure Normally ->s_dentry is cleared when dentry it's pointing to becomes negative (on eviction, realistically). However, that only happens if dentry gets to be positive in the first place; in case of inode allocation failure dentry never becomes positive, so ->d_iput() is not called at all. We do part of what normally would've been done by configfs_d_iput() (dropping the reference to configfs_dirent) manually, but we do not clear ->s_dentry there. Sloppy as it is, it does not matter in case of configfs_create_{dir,link}() - there configfs_dirent does not survive dropping the sole reference to it. However, for configfs_lookup() it *does* survive, with a dangling pointer to soon to be freed dentry sitting it its ->s_dentry. Subsequent getdents(2) in that directory will end up dereferencing that pointer in order to pick the inode number. Use after free... This is the minimal fix; the right approach is to set the linkage between dentry and configfs_dirent only after we know that we have an inode, but that takes more surgery and the bug had been there since 2006, so...
CVE-2026-74359
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-2026-74359
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": "3d0f89bb169482d26d5aa4e82e763077e7e9bc4d",
"lessThan": "3e83b2203aa59bd279e4f677ec793d49dc9d019e",
"versionType": "git"
},
{
"status": "affected",
"version": "3d0f89bb169482d26d5aa4e82e763077e7e9bc4d",
"lessThan": "b6e9c82522ddaa3ac0706b295ff4a71975d4f883",
"versionType": "git"
},
{
"status": "affected",
"version": "3d0f89bb169482d26d5aa4e82e763077e7e9bc4d",
"lessThan": "eee07d769da5ac4e4f7bd0bc17828646a318d499",
"versionType": "git"
},
{
"status": "affected",
"version": "3d0f89bb169482d26d5aa4e82e763077e7e9bc4d",
"lessThan": "9c747dcee164ead300de90550ad9e4122f0d1bbb",
"versionType": "git"
},
{
"status": "affected",
"version": "3d0f89bb169482d26d5aa4e82e763077e7e9bc4d",
"lessThan": "c3b073a209a9baa691b744318ac929fecdd8847c",
"versionType": "git"
},
{
"status": "affected",
"version": "3d0f89bb169482d26d5aa4e82e763077e7e9bc4d",
"lessThan": "57088b06109f3222963c639d8d743f42c2899b13",
"versionType": "git"
},
{
"status": "affected",
"version": "3d0f89bb169482d26d5aa4e82e763077e7e9bc4d",
"lessThan": "10da12d352b7b2bb330a8609fdda9a58bf0e9856",
"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": "5.15.212",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.178",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.145",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.97",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.40",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.5",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"fs/configfs/dir.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-74359
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #33109 · Revision 1
- Added to Heist Feed
- Publisher date