CVE-2024-47660
- Source
- https://cve.org/CVERecord?id=CVE-2024-47660
- Import Source
- https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2024-47660.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/CVE-2024-47660
- Downstream
- Related
- Published
- 2024-10-09T14:02:54.884Z
- Modified
- 2026-05-07T04:17:29.309738Z
- Summary
- fsnotify: clear PARENT_WATCHED flags lazily
- Details
-
In 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 __fsnotifyupdatechild_dentryflags() function can take a significant amount of time. Since the bulk of this function happens under inode->ilock this causes a significant contention on the lock when we remove the watch from the directory as the __fsnotifyupdatechilddentryflags() call from fsnotifyrecalcmask() races with __fsnotifyupdatechilddentryflags() calls from _fsnotifyparent() happening on children. This can lead upto softlockup reports reported by users.
Fix the problem by calling fsnotifyupdatechildrendentryflags() to set PARENT_WATCHED flags only when parent starts watching children.
When parent stops watching children, clear false positive PARENT_WATCHED flags lazily in _fsnotifyparent() for each accessed child.
- Database specific
{ "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/47xxx/CVE-2024-47660.json", "cna_assigner": "Linux" }- References
-
- https://git.kernel.org/stable/c/172e422ffea20a89bfdc672741c1aad6fbb5044e
- https://git.kernel.org/stable/c/3f3ef1d9f66b93913ce2171120d9226b55acd41d
- https://git.kernel.org/stable/c/7ef1d2e240c32b1f337a37232d037b07e3919e1a
- https://git.kernel.org/stable/c/d8c42405fc3507cc43ba7e4986a773c3fc633f6e
- https://git.kernel.org/stable/c/f9a48bc3dd9099935751458a5bbbea4b7c28abc8
- https://git.kernel.org/stable/c/fc1b1e135c3f72382f792e6c319fc088d5523ad5
- https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/47xxx/CVE-2024-47660.json
- https://nvd.nist.gov/vuln/detail/CVE-2024-47660
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Affected packages
Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Affected ranges
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced873feea09ebc980cbd3631b767356ce1eee65ec1Fixed3f3ef1d9f66b93913ce2171120d9226b55acd41dFixedf9a48bc3dd9099935751458a5bbbea4b7c28abc8Fixedd8c42405fc3507cc43ba7e4986a773c3fc633f6eFixedfc1b1e135c3f72382f792e6c319fc088d5523ad5Fixed7ef1d2e240c32b1f337a37232d037b07e3919e1aFixed172e422ffea20a89bfdc672741c1aad6fbb5044e