🛡️ CVE-2025-68168 — kernel

🟠 CVSS 7.8 — High ✅ No Known Exploit NVD
7.8
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

jfs: fix uninitialized waitqueue in transaction manager

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

jfs: fix uninitialized waitqueue in transaction manager

The transaction manager initialization in txInit() was not properly

initializing TxBlock[0].waitor waitqueue, causing a crash when

txEnd(0) is called on read-only filesystems.

When a filesystem is mounted read-only, txBegin() returns tid=0 to

indicate no transaction. However, txEnd(0) still gets called and

tries to access TxBlock[0].waitor via tid_to_tblock(0), but this

waitqueue was never initialized because the initialization loop

started at index 1 instead of 0.

This causes a 'non-static key' lockdep warning and system crash:

INFO: trying to register non-static key in txEnd

Fix by ensuring all transaction blocks including TxBlock[0] have

their waitqueues properly initialized during txInit().

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 high, integrity high, availability high.

Affected software

CVE-2025-68168 is recorded against 2 packages.

  • kernel (from 6.7.0 up to 6.17.8)
  • unknown

Timeline and source

Published on 16 December 2025 and last revised on 6 August 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

git.kernel.org (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)
git.kernel.org (Web)
github.com (Advisory)
nvd.nist.gov (Advisory)
git.kernel.org (Package)

CVE-2025-68168 on other distributions

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

Details

Severity High
CVSS Score 7.8
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE N/A
Public Exploit ✅ No
Source NVD
Published 2025-12-16
Updated 2026-08-12
Modified 2026-08-06
Fix URL N/A

Affected Packages

Software From version Fixed in
kernel 6.7.0 6.17.8
unknown — —

References

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