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CVE-2025-40348

Estado: AplazadaSin puntuar—

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

slab: Avoid race on slab->obj_exts in alloc_slab_obj_exts

If two competing threads enter alloc_slab_obj_exts() and one of them fails to allocate the object extension vector, it might override the valid slab->obj_exts allocated by the other thread with OBJEXTS_ALLOC_FAIL. This will cause the thread that lost this race and expects a valid pointer to dereference a NULL pointer later on.

Update slab->obj_exts atomically using cmpxchg() to avoid slab->obj_exts overrides by racing threads.

Thanks for Vlastimil and Suren's help with debugging.

CVSS

NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Linux — Linux KernelAI

Referencias

JSON original (NVD)

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{
  "id": "CVE-2025-40348",
  "cveTags": [],
  "metrics": {},
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "715b6a5b41dae39baeaa40d3386b548bb278b9c2",
              "lessThan": "c7af5300d78460fc5037ddc77113ba3dbfe77dc0",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "07e38a54cabd9b4de7ceb7f075f29ffa463e458a",
              "lessThan": "7c34feda6a9a203c9744281f1b6671b7dad2012d",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "f7381b9116407ba2a429977c80ff8df953ea9354",
              "lessThan": "6ed8bfd24ce1cb31742b09a3eb557cd008533eec",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "mm/slub.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.12.54",
              "lessThan": "6.12.56",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "6.17.4",
              "lessThan": "6.17.6",
              "versionType": "semver"
            }
          ],
          "programFiles": [
            "mm/slub.c"
          ],
          "defaultStatus": "unaffected"
        }
      ]
    }
  ],
  "published": "2025-12-16T14:15:46.583",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/6ed8bfd24ce1cb31742b09a3eb557cd008533eec",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/7c34feda6a9a203c9744281f1b6671b7dad2012d",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/c7af5300d78460fc5037ddc77113ba3dbfe77dc0",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Deferred",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nslab: Avoid race on slab->obj_exts in alloc_slab_obj_exts\n\nIf two competing threads enter alloc_slab_obj_exts() and one of them\nfails to allocate the object extension vector, it might override the\nvalid slab->obj_exts allocated by the other thread with\nOBJEXTS_ALLOC_FAIL. This will cause the thread that lost this race and\nexpects a valid pointer to dereference a NULL pointer later on.\n\nUpdate slab->obj_exts atomically using cmpxchg() to avoid\nslab->obj_exts overrides by racing threads.\n\nThanks for Vlastimil and Suren's help with debugging."
    }
  ],
  "lastModified": "2026-06-17T09:21:41.850",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}