ghsa-r3mj-3wvr-4c72
Vulnerability from github
Published
2025-12-16 18:31
Modified
2025-12-16 18:31
Details

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

mm/huge_memory: fix NULL pointer deference when splitting folio

Commit c010d47f107f ("mm: thp: split huge page to any lower order pages") introduced an early check on the folio's order via mapping->flags before proceeding with the split work.

This check introduced a bug: for shmem folios in the swap cache and truncated folios, the mapping pointer can be NULL. Accessing mapping->flags in this state leads directly to a NULL pointer dereference.

This commit fixes the issue by moving the check for mapping != NULL before any attempt to access mapping->flags.

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{
  "affected": [],
  "aliases": [
    "CVE-2025-68293"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-12-16T16:16:08Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/huge_memory: fix NULL pointer deference when splitting folio\n\nCommit c010d47f107f (\"mm: thp: split huge page to any lower order pages\")\nintroduced an early check on the folio\u0027s order via mapping-\u003eflags before\nproceeding with the split work.\n\nThis check introduced a bug: for shmem folios in the swap cache and\ntruncated folios, the mapping pointer can be NULL.  Accessing\nmapping-\u003eflags in this state leads directly to a NULL pointer dereference.\n\nThis commit fixes the issue by moving the check for mapping != NULL before\nany attempt to access mapping-\u003eflags.",
  "id": "GHSA-r3mj-3wvr-4c72",
  "modified": "2025-12-16T18:31:33Z",
  "published": "2025-12-16T18:31:33Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-68293"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/592db83615a9f0164472ec789c2ed34ad35f732f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cff47b9e39a6abf03dde5f4f156f841b0c54bba0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d1b83fbacd4397a1d2f8c6b13427a8636ae2b307"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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