GHSA-27RC-RCPV-8MR7

Vulnerability from github – Published: 2025-10-01 09:30 – Updated: 2025-11-03 18:31
VLAI?
Details

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

mm/slub: avoid accessing metadata when pointer is invalid in object_err()

object_err() reports details of an object for further debugging, such as the freelist pointer, redzone, etc. However, if the pointer is invalid, attempting to access object metadata can lead to a crash since it does not point to a valid object.

One known path to the crash is when alloc_consistency_checks() determines the pointer to the allocated object is invalid because of a freelist corruption, and calls object_err() to report it. The debug code should report and handle the corruption gracefully and not crash in the process.

In case the pointer is NULL or check_valid_pointer() returns false for the pointer, only print the pointer value and skip accessing metadata.

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{
  "affected": [],
  "aliases": [
    "CVE-2025-39902"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-10-01T08:15:32Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/slub: avoid accessing metadata when pointer is invalid in object_err()\n\nobject_err() reports details of an object for further debugging, such as\nthe freelist pointer, redzone, etc. However, if the pointer is invalid,\nattempting to access object metadata can lead to a crash since it does\nnot point to a valid object.\n\nOne known path to the crash is when alloc_consistency_checks()\ndetermines the pointer to the allocated object is invalid because of a\nfreelist corruption, and calls object_err() to report it. The debug code\nshould report and handle the corruption gracefully and not crash in the\nprocess.\n\nIn case the pointer is NULL or check_valid_pointer() returns false for\nthe pointer, only print the pointer value and skip accessing metadata.",
  "id": "GHSA-27rc-rcpv-8mr7",
  "modified": "2025-11-03T18:31:44Z",
  "published": "2025-10-01T09:30:24Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-39902"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0ef7058b4dc6fcef622ac23b45225db57f17b83f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1f0797f17927b5cad0fb7eced422f9a7c30a3191"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3baa1da473e6e50281324ff1d332d1a07a3bb02e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7e287256904ee796c9477e3ec92b07f236481ef3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/872f2c34ff232af1e65ad2df86d61163c8ffad42"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b4efccec8d06ceb10a7d34d7b1c449c569d53770"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/dda6ec365ab04067adae40ef17015db447e90736"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f66012909e7bf383fcdc5850709ed5716073fdc4"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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