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🛡️ CVE-2024-57941 — kernel

🟡 CVSS 5.5 — Medium ✅ No Known Exploit NVD
5.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

netfs: Fix the (non-)cancellation of copy when cache is temporarily disabled

In the Linux kernel, the following vulnerability has been resolved:

netfs: Fix the (non-)cancellation of copy when cache is temporarily disabled

When the caching for a cookie is temporarily disabled (e.g. due to a DIO

write on that file), future copying to the cache for that file is disabled

until all fds open on that file are closed. However, if netfslib is using

the deprecated PG_private_2 method (such as is currently used by ceph), and

decides it wants to copy to the cache, netfs_advance_write() will just bail

at the first check seeing that the cache stream is unavailable, and

indicate that it dealt with all the content.

This means that we have no subrequests to provide notifications to drive

the state machine or even to pin the request and the request just gets

discarded, leaving the folios with PG_private_2 set.

Fix this by jumping directly to cancel the request if the cache is not

available. That way, we don't remove mark3 from the folio_queue list and

netfs_pgpriv2_cancel() will clean up the folios.

This was found by running the generic/013 xfstest against ceph with an

active cache and the "-o fsc" option passed to ceph. That would usually

hang

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, 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:L/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: Low — the attack works reliably, with no preparation.
  • 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-2024-57941 is recorded against 2 packages.

  • kernel (from 6.12.0 up to 6.12.10)
  • linux-kernel

Timeline and source

Published on 21 January 2025 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

git.kernel.org (Web)
git.kernel.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-2024-57941 on other distributions

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

Details

Severity Medium
CVSS Score 5.5
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE N/A
Public Exploit ✅ No
Source NVD
Published 2025-01-21
Updated 2026-08-20
Modified 2026-08-12

Affected Packages

Software From version Fixed in
kernel 6.12.0 6.12.10
linux-kernel — —

Similar Threats

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