fkie_cve-2025-68293
Vulnerability from fkie_nvd
Published
2025-12-16 16:16
Modified
2025-12-18 15:08
Severity ?
Summary
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/592db83615a9f0164472ec789c2ed34ad35f732f
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/cff47b9e39a6abf03dde5f4f156f841b0c54bba0
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d1b83fbacd4397a1d2f8c6b13427a8636ae2b307
Impacted products
Vendor Product Version


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{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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": "CVE-2025-68293",
  "lastModified": "2025-12-18T15:08:06.237",
  "metrics": {},
  "published": "2025-12-16T16:16:08.190",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/592db83615a9f0164472ec789c2ed34ad35f732f"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/cff47b9e39a6abf03dde5f4f156f841b0c54bba0"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/d1b83fbacd4397a1d2f8c6b13427a8636ae2b307"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


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