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Description

In the Linux kernel, the following vulnerability has been resolved: hung_task: fix warnings caused by unaligned lock pointers The blocker tracking mechanism assumes that lock pointers are at least 4-byte aligned to use their lower bits for type encoding. However, as reported by Eero Tamminen, some architectures like m68k only guarantee 2-byte alignment of 32-bit values. This breaks the assumption and causes two related WARN_ON_ONCE checks to trigger. To fix this, the runtime checks are adjusted to silently ignore any lock that is not 4-byte aligned, effectively disabling the feature in such cases and avoiding the related warnings. Thanks to Geert Uytterhoeven for bisecting!

PUBLISHED Reserved 2025-12-16 | Published 2025-12-16 | Updated 2025-12-16 | Assigner Linux

Product status

Default status
unaffected

e711faaafbe54a884f33b53472434063d342f6d4 (git) before c0e2dcbe54cb15ecdf9d8f4501c6720423243888
affected

e711faaafbe54a884f33b53472434063d342f6d4 (git) before c97513cddcfc235f2522617980838e500af21d01
affected

Default status
affected

6.16
affected

Any version before 6.16
unaffected

6.17.6 (semver)
unaffected

6.18 (original_commit_for_fix)
unaffected

References

git.kernel.org/...c/c0e2dcbe54cb15ecdf9d8f4501c6720423243888

git.kernel.org/...c/c97513cddcfc235f2522617980838e500af21d01

cve.org (CVE-2025-68250)

nvd.nist.gov (CVE-2025-68250)

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Data based on CVE®. Copyright © 1999-2025, The MITRE Corporation. All rights reserved.