CVE-2025-68250 (GCVE-0-2025-68250)

Vulnerability from cvelistv5 – Published: 2025-12-16 14:32 – Updated: 2025-12-16 14:32
VLAI?
Title
hung_task: fix warnings caused by unaligned lock pointers
Summary
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!
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: e711faaafbe54a884f33b53472434063d342f6d4 , < c0e2dcbe54cb15ecdf9d8f4501c6720423243888 (git)
Affected: e711faaafbe54a884f33b53472434063d342f6d4 , < c97513cddcfc235f2522617980838e500af21d01 (git)
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    Linux Linux Affected: 6.16
Unaffected: 0 , < 6.16 (semver)
Unaffected: 6.17.6 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nhung_task: fix warnings caused by unaligned lock pointers\n\nThe blocker tracking mechanism assumes that lock pointers are at least\n4-byte aligned to use their lower bits for type encoding.\n\nHowever, as reported by Eero Tamminen, some architectures like m68k\nonly guarantee 2-byte alignment of 32-bit values. This breaks the\nassumption and causes two related WARN_ON_ONCE checks to trigger.\n\nTo fix this, the runtime checks are adjusted to silently ignore any lock\nthat is not 4-byte aligned, effectively disabling the feature in such\ncases and avoiding the related warnings.\n\nThanks to Geert Uytterhoeven for bisecting!"
        }
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      "providerMetadata": {
        "dateUpdated": "2025-12-16T14:32:17.173Z",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-68250",
    "datePublished": "2025-12-16T14:32:17.173Z",
    "dateReserved": "2025-12-16T13:41:40.266Z",
    "dateUpdated": "2025-12-16T14:32:17.173Z",
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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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