CVE-2025-68293 (GCVE-0-2025-68293)
Vulnerability from cvelistv5
Published
2025-12-16 15:06
Modified
2025-12-16 15:06
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
Impacted products
Vendor Product Version
Linux Linux Version: c010d47f107f609b9f4d6a103b6dfc53889049e9
Version: c010d47f107f609b9f4d6a103b6dfc53889049e9
Version: c010d47f107f609b9f4d6a103b6dfc53889049e9
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{
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          "product": "Linux",
          "programFiles": [
            "mm/huge_memory.c"
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          "vendor": "Linux",
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          "vendor": "Linux",
          "versions": [
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              "version": "0",
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              ],
              "negate": false,
              "operator": "OR"
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      ],
      "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-12-16T15:06:13.428Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        },
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          "url": "https://git.kernel.org/stable/c/d1b83fbacd4397a1d2f8c6b13427a8636ae2b307"
        },
        {
          "url": "https://git.kernel.org/stable/c/cff47b9e39a6abf03dde5f4f156f841b0c54bba0"
        }
      ],
      "title": "mm/huge_memory: fix NULL pointer deference when splitting folio",
      "x_generator": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-68293",
    "datePublished": "2025-12-16T15:06:13.428Z",
    "dateReserved": "2025-12-16T14:48:05.292Z",
    "dateUpdated": "2025-12-16T15:06:13.428Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
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  "vulnerability-lookup:meta": {
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  }
}


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