CVE-2025-40348 (GCVE-0-2025-40348)
Vulnerability from cvelistv5
Published
2025-12-16 13:30
Modified
2025-12-16 13:30
Severity ?
Summary
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 715b6a5b41dae39baeaa40d3386b548bb278b9c2
Version: 07e38a54cabd9b4de7ceb7f075f29ffa463e458a
Version: f7381b9116407ba2a429977c80ff8df953ea9354
 Create a notification for this product.
   Linux Linux Version: 6.12.54   ≤
Version: 6.17.4   ≤
Create a notification for this product.
Show details on NVD website

To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "mm/slub.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "c7af5300d78460fc5037ddc77113ba3dbfe77dc0",
              "status": "affected",
              "version": "715b6a5b41dae39baeaa40d3386b548bb278b9c2",
              "versionType": "git"
            },
            {
              "lessThan": "7c34feda6a9a203c9744281f1b6671b7dad2012d",
              "status": "affected",
              "version": "07e38a54cabd9b4de7ceb7f075f29ffa463e458a",
              "versionType": "git"
            },
            {
              "lessThan": "6ed8bfd24ce1cb31742b09a3eb557cd008533eec",
              "status": "affected",
              "version": "f7381b9116407ba2a429977c80ff8df953ea9354",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "mm/slub.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "6.12.56",
              "status": "affected",
              "version": "6.12.54",
              "versionType": "semver"
            },
            {
              "lessThan": "6.17.6",
              "status": "affected",
              "version": "6.17.4",
              "versionType": "semver"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.56",
                  "versionStartIncluding": "6.12.54",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.17.6",
                  "versionStartIncluding": "6.17.4",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nslab: Avoid race on slab-\u003eobj_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-\u003eobj_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-\u003eobj_exts atomically using cmpxchg() to avoid\nslab-\u003eobj_exts overrides by racing threads.\n\nThanks for Vlastimil and Suren\u0027s help with debugging."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-12-16T13:30:22.368Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/c7af5300d78460fc5037ddc77113ba3dbfe77dc0"
        },
        {
          "url": "https://git.kernel.org/stable/c/7c34feda6a9a203c9744281f1b6671b7dad2012d"
        },
        {
          "url": "https://git.kernel.org/stable/c/6ed8bfd24ce1cb31742b09a3eb557cd008533eec"
        }
      ],
      "title": "slab: Avoid race on slab-\u003eobj_exts in alloc_slab_obj_exts",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-40348",
    "datePublished": "2025-12-16T13:30:22.368Z",
    "dateReserved": "2025-04-16T07:20:57.187Z",
    "dateUpdated": "2025-12-16T13:30:22.368Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2025-40348\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-12-16T14:15:46.583\",\"lastModified\":\"2025-12-18T15:08:25.907\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nslab: Avoid race on slab-\u003eobj_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-\u003eobj_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-\u003eobj_exts atomically using cmpxchg() to avoid\\nslab-\u003eobj_exts overrides by racing threads.\\n\\nThanks for Vlastimil and Suren\u0027s help with debugging.\"}],\"metrics\":{},\"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\"}]}}"
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.