CVE-2024-47660

MEDIUM EPSS 5.5%
Published Oct 9, 20241y ago · Modified Jun 17, 20262w ago
4.7 CVSS 3.1
Medium
Find Similar
Published Oct 9, 2024 1y ago
Last Modified Jun 17, 2026 2w ago

Description

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 Details

Base Score
4.7
Exploitability
1.0
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity High
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
5.5% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-362

Affected Products 5

VendorProductVersionRange
linuxlinux_kernel* <5.10.226
linuxlinux_kernel*≥5.11  –  <5.15.167
linuxlinux_kernel*≥5.16  –  <6.1.109
linuxlinux_kernel*≥6.2  –  <6.6.50
linuxlinux_kernel*≥6.7  –  <6.10.9

References 9

  • cert-portal.siemens.com https://cert-portal.siemens.com/productcert/html/ssa-265688.html
  • cert-portal.siemens.com https://cert-portal.siemens.com/productcert/html/ssa-355557.html
  • git.kernel.org https://git.kernel.org/stable/c/172e422ffea20a89bfdc672741c1aad6fbb5044e
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/3f3ef1d9f66b93913ce2171120d9226b55acd41d
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/7ef1d2e240c32b1f337a37232d037b07e3919e1a
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/d8c42405fc3507cc43ba7e4986a773c3fc633f6e
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/f9a48bc3dd9099935751458a5bbbea4b7c28abc8
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/fc1b1e135c3f72382f792e6c319fc088d5523ad5
    Patch
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/172e422ffea20a89bfdc672741c1aad6fbb5044e
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/3f3ef1d9f66b93913ce2171120d9226b55acd41d
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/7ef1d2e240c32b1f337a37232d037b07e3919e1a
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/d8c42405fc3507cc43ba7e4986a773c3fc633f6e
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/f9a48bc3dd9099935751458a5bbbea4b7c28abc8
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/fc1b1e135c3f72382f792e6c319fc088d5523ad5
    Patch