CVE-2025-68293 (GCVE-0-2025-68293)

Vulnerability from cvelistv5 – Published: 2025-12-16 15:06 – Updated: 2026-05-11 21:50
VLAI
Title
mm/huge_memory: fix NULL pointer deference when splitting folio
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.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7033 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: c010d47f107f609b9f4d6a103b6dfc53889049e9 , < 592db83615a9f0164472ec789c2ed34ad35f732f (git)
Affected: c010d47f107f609b9f4d6a103b6dfc53889049e9 , < d1b83fbacd4397a1d2f8c6b13427a8636ae2b307 (git)
Affected: c010d47f107f609b9f4d6a103b6dfc53889049e9 , < cff47b9e39a6abf03dde5f4f156f841b0c54bba0 (git)
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Linux Linux Affected: 6.9
Unaffected: 0 , < 6.9 (semver)
Unaffected: 6.12.61 , ≤ 6.12.* (semver)
Unaffected: 6.17.11 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
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          "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."
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    "datePublished": "2025-12-16T15:06:13.428Z",
    "dateReserved": "2025-12-16T14:48:05.292Z",
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            "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."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nmm/huge_memory: correcci\u00f3n de desreferencia de puntero NULL al dividir folio\n\nEl commit c010d47f107f (\u0027mm: thp: split huge page to any lower order pages\u0027) introdujo una verificaci\u00f3n temprana del orden del folio a trav\u00e9s de mapping -\u003e flags antes de proceder con el trabajo de divisi\u00f3n.\n\nEsta verificaci\u00f3n introdujo un error: para folios shmem en la cach\u00e9 de intercambio y folios truncados, el puntero mapping puede ser NULL. Acceder a mapping -\u003e flags en este estado conduce directamente a una desreferencia de puntero NULL.\n\nEste commit soluciona el problema moviendo la verificaci\u00f3n de mapping != NULL antes de cualquier intento de acceder a mapping -\u003e flags."
          }
        ],
        "id": "CVE-2025-68293",
        "lastModified": "2026-10-14T16:10:00.250",
        "metrics": {},
        "published": "2025-12-16T16:16:08.190",
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      "cve": "CVE-2025-68293",
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      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: mm/huge_memory: fix NULL pointer deference when splitting folio",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-68293.json",
      "version": "3"
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}



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