fsnotify: clear PARENT_WATCHED flags lazily

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Summary

CVECVE-2024-47660
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2024-10-09 14:15:07 UTC
Updated2026-05-12 12:17:12 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: fsnotify: clear PARENT_WATCHED flags lazily In some setups directories can have many (usually negative) dentries. Hence __fsnotify_update_child_dentry_flags() function can take a significant amount of time. Since the bulk of this function happens under inode->i_lock this causes a significant contention on the lock when we remove the watch from the directory as the __fsnotify_update_child_dentry_flags() call from fsnotify_recalc_mask() races with __fsnotify_update_child_dentry_flags() calls from __fsnotify_parent() happening on children. This can lead upto softlockup reports reported by users. Fix the problem by calling fsnotify_update_children_dentry_flags() to set PARENT_WATCHED flags only when parent starts watching children. When parent stops watching children, clear false positive PARENT_WATCHED flags lazily in __fsnotify_parent() for each accessed child.

Risk And Classification

Primary CVSS: v3.1 4.7 MEDIUM from [email protected]

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

Problem Types: CWE-362

CVSS v3.1 Breakdown

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

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 873feea09ebc980cbd3631b767356ce1eee65ec1 3f3ef1d9f66b93913ce2171120d9226b55acd41d git Not specified
CNA Linux Linux affected 873feea09ebc980cbd3631b767356ce1eee65ec1 f9a48bc3dd9099935751458a5bbbea4b7c28abc8 git Not specified
CNA Linux Linux affected 873feea09ebc980cbd3631b767356ce1eee65ec1 d8c42405fc3507cc43ba7e4986a773c3fc633f6e git Not specified
CNA Linux Linux affected 873feea09ebc980cbd3631b767356ce1eee65ec1 fc1b1e135c3f72382f792e6c319fc088d5523ad5 git Not specified
CNA Linux Linux affected 873feea09ebc980cbd3631b767356ce1eee65ec1 7ef1d2e240c32b1f337a37232d037b07e3919e1a git Not specified
CNA Linux Linux affected 873feea09ebc980cbd3631b767356ce1eee65ec1 172e422ffea20a89bfdc672741c1aad6fbb5044e git Not specified
CNA Linux Linux affected 2.6.38 Not specified
CNA Linux Linux unaffected 2.6.38 semver Not specified
CNA Linux Linux unaffected 5.10.226 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.167 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.109 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.50 6.6.* semver Not specified
CNA Linux Linux unaffected 6.10.9 6.10.* semver Not specified
CNA Linux Linux unaffected 6.11 * original_commit_for_fix Not specified
ADP Siemens RUGGEDCOM RST2428P affected V3.2 custom Not specified
ADP Siemens SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 Family affected V3.2 custom Not specified
ADP Siemens SCALANCE XCM-/XRM-/XCH-/XRH-300 Family affected V3.2 custom Not specified
ADP Siemens SIMATIC S7-1500 TM MFP - GNU/Linux Subsystem affected * custom Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/d8c42405fc3507cc43ba7e4986a773c3fc633f6e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/172e422ffea20a89bfdc672741c1aad6fbb5044e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
cert-portal.siemens.com/productcert/html/ssa-265688.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com
git.kernel.org/stable/c/fc1b1e135c3f72382f792e6c319fc088d5523ad5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/3f3ef1d9f66b93913ce2171120d9226b55acd41d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
cert-portal.siemens.com/productcert/html/ssa-355557.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com
git.kernel.org/stable/c/7ef1d2e240c32b1f337a37232d037b07e3919e1a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
lists.debian.org/debian-lts-announce/2025/01/msg00001.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org
git.kernel.org/stable/c/f9a48bc3dd9099935751458a5bbbea4b7c28abc8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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