ghsa-pxw3-4w95-6fmq
Vulnerability from github
Published
2025-12-16 15:30
Modified
2025-12-16 15:30
Details

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!

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{
  "affected": [],
  "aliases": [
    "CVE-2025-68250"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-12-16T15:15:54Z",
    "severity": null
  },
  "details": "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!",
  "id": "GHSA-pxw3-4w95-6fmq",
  "modified": "2025-12-16T15:30:47Z",
  "published": "2025-12-16T15:30:47Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-68250"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c0e2dcbe54cb15ecdf9d8f4501c6720423243888"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c97513cddcfc235f2522617980838e500af21d01"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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