FKIE_CVE-2025-68293

Vulnerability from fkie_nvd - Published: 2025-12-16 16:16 - Updated: 2026-10-14 16:10
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
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "mm/huge_memory.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "592db83615a9f0164472ec789c2ed34ad35f732f",
              "status": "affected",
              "version": "c010d47f107f609b9f4d6a103b6dfc53889049e9",
              "versionType": "git"
            },
            {
              "lessThan": "d1b83fbacd4397a1d2f8c6b13427a8636ae2b307",
              "status": "affected",
              "version": "c010d47f107f609b9f4d6a103b6dfc53889049e9",
              "versionType": "git"
            },
            {
              "lessThan": "cff47b9e39a6abf03dde5f4f156f841b0c54bba0",
              "status": "affected",
              "version": "c010d47f107f609b9f4d6a103b6dfc53889049e9",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "mm/huge_memory.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.9"
            },
            {
              "lessThan": "6.9",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.61",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.17.*",
              "status": "unaffected",
              "version": "6.17.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.18",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "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."
    },
    {
      "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",
  "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": "Deferred"
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON

Loading timeline…




    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.