CVE-2024-47660fsnotify: clear PARENT_WATCHED flags lazily
Updated under an hour ago ()
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It affects Linux and 5 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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 __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.
- CVSS
- 4.7 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Modified
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 15, 2026
Affected products
Linux Linux linux:linux (from the name) | 873feea09ebc980cbd3631b767356ce1eee65ec1 builds before 3f3ef1d9f66b93913ce2171120d9226b55acd41d; from 873feea09ebc980cbd3631b767356ce1eee65ec1 before f9a48bc3dd9099935751458a5bbbea4b7c28abc8; from 873feea09ebc980cbd3631b767356ce1eee65ec1 before d8c42405fc3507cc43ba7e4986a773c3fc633f6e; from 873feea09ebc980cbd3631b767356ce1eee65ec1 before fc1b1e135c3f72382f792e6c319fc088d5523ad5; 873feea09ebc980cbd3631b767356ce1eee65ec1 builds before 7ef1d2e240c32b1f337a37232d037b07e3919e1a; 873feea09ebc980cbd3631b767356ce1eee65ec1 builds before 172e422ffea20a89bfdc672741c1aad6fbb5044e | CNA record |
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem siemens:simatic_s7_1500_tm_mfp_gnu_linux_subsystem (from the name) | before V1.1.1 | CISA ADP |
Siemens RUGGEDCOM RST2428P siemens:ruggedcom_rst2428p (from the name) | before V3.2 | CISA ADP |
Siemens SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family siemens:scalance_xc_300_xr_300_xc_400_xr_500wg_xr_500_family (from the name) | before V3.2 | CISA ADP |
Siemens SCALANCE XCM-/XRM-/XCH-/XRH-300 family siemens:scalance_xcm_xrm_xch_xrh_300_family (from the name) | before V3.2 | CISA ADP |
linux linux_kernel linux:linux_kernel | before 5.10.226; from 5.11 before 5.15.167; from 5.16 before 6.1.109; from 6.2 before 6.6.50; from 6.7 before 6.10.9 | NVD |
References
- https://git.kernel.org/stable/c/3f3ef1d9f66b93913ce2171120d9226b55acd41dpatch
- https://git.kernel.org/stable/c/f9a48bc3dd9099935751458a5bbbea4b7c28abc8patch
- https://git.kernel.org/stable/c/d8c42405fc3507cc43ba7e4986a773c3fc633f6epatch
- https://git.kernel.org/stable/c/fc1b1e135c3f72382f792e6c319fc088d5523ad5patch
- https://git.kernel.org/stable/c/7ef1d2e240c32b1f337a37232d037b07e3919e1apatch
- https://git.kernel.org/stable/c/172e422ffea20a89bfdc672741c1aad6fbb5044epatch
- https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html
- https://cert-portal.siemens.com/productcert/html/ssa-265688.html
- https://cert-portal.siemens.com/productcert/html/ssa-355557.html
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.