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🛡️ CVE-2024-47660 — kernel

🟡 CVSS 4.7 — Medium ✅ No Known Exploit NVD
4.7
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

fsnotify: clear PARENT_WATCHED flags lazily

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.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is high, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability high.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

  • Attack vector: Local — a local account, shell or session on the host is needed.
  • Attack complexity: High — the attacker first has to win a race, learn a secret or otherwise prepare the target.
  • Privileges required: Low — an ordinary user account is enough.
  • User interaction: None — nobody has to be tricked into anything.
  • Scope: Unchanged — the damage stays inside the vulnerable component.
  • Confidentiality impact: None.
  • Integrity impact: None.
  • Availability impact: High — total loss, or loss the attacker controls.

Affected software

CVE-2024-47660 is recorded against 2 packages.

  • kernel (from 6.7.0 up to 6.10.9)
  • linux-kernel (from 6.7 up to 6.10.9)

Timeline and source

Published on 9 October 2024 and last revised on 12 August 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

cert-portal.siemens.com (Web)
cert-portal.siemens.com (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
lists.debian.org (Web)
github.com (Advisory)
nvd.nist.gov (Advisory)
git.kernel.org (Package)

Other advisories for this package

kernel has other advisories on record. If you are patching this one, these are worth checking on the same host:

CVE-2024-47660 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity Medium
CVSS Score 4.7
CVSS Vector CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE N/A
Public Exploit ✅ No
Source NVD
Published 2024-10-09
Updated 2026-08-20
Modified 2026-08-12

Affected Packages

Software From version Fixed in
kernel 6.7.0 6.10.9
linux-kernel 6.7 6.10.9

References

Similar Threats

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