configfs_lookup(): don't leave ->s_dentry dangling on failure

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-74359
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 06:22:37 UTC
Updated2026-08-17 06:19:30 UTC
DescriptionIn 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...

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.001250000 probability, percentile 0.026490000 (date 2026-08-17)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 3d0f89bb169482d26d5aa4e82e763077e7e9bc4d 3e83b2203aa59bd279e4f677ec793d49dc9d019e git Not specified
CNA Linux Linux affected 3d0f89bb169482d26d5aa4e82e763077e7e9bc4d b6e9c82522ddaa3ac0706b295ff4a71975d4f883 git Not specified
CNA Linux Linux affected 3d0f89bb169482d26d5aa4e82e763077e7e9bc4d eee07d769da5ac4e4f7bd0bc17828646a318d499 git Not specified
CNA Linux Linux affected 3d0f89bb169482d26d5aa4e82e763077e7e9bc4d 9c747dcee164ead300de90550ad9e4122f0d1bbb git Not specified
CNA Linux Linux affected 3d0f89bb169482d26d5aa4e82e763077e7e9bc4d c3b073a209a9baa691b744318ac929fecdd8847c git Not specified
CNA Linux Linux affected 3d0f89bb169482d26d5aa4e82e763077e7e9bc4d 57088b06109f3222963c639d8d743f42c2899b13 git Not specified
CNA Linux Linux affected 3d0f89bb169482d26d5aa4e82e763077e7e9bc4d 10da12d352b7b2bb330a8609fdda9a58bf0e9856 git Not specified
CNA Linux Linux affected 2.6.16 Not specified
CNA Linux Linux unaffected 2.6.16 semver Not specified
CNA Linux Linux unaffected 5.15.212 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.178 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.145 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.97 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.40 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.5 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/eee07d769da5ac4e4f7bd0bc17828646a318d499 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/57088b06109f3222963c639d8d743f42c2899b13 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3e83b2203aa59bd279e4f677ec793d49dc9d019e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/9c747dcee164ead300de90550ad9e4122f0d1bbb 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/10da12d352b7b2bb330a8609fdda9a58bf0e9856 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c3b073a209a9baa691b744318ac929fecdd8847c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b6e9c82522ddaa3ac0706b295ff4a71975d4f883 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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