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CVE-2026-31400 (GCVE-0-2026-31400)

Vulnerability from cvelistv5 – Published: 2026-04-03 15:16 – Updated: 2026-05-11 22:07
VLAI
Title
sunrpc: fix cache_request leak in cache_release
Summary
In the Linux kernel, the following vulnerability has been resolved: sunrpc: fix cache_request leak in cache_release When a reader's file descriptor is closed while in the middle of reading a cache_request (rp->offset != 0), cache_release() decrements the request's readers count but never checks whether it should free the request. In cache_read(), when readers drops to 0 and CACHE_PENDING is clear, the cache_request is removed from the queue and freed along with its buffer and cache_head reference. cache_release() lacks this cleanup. The only other path that frees requests with readers == 0 is cache_dequeue(), but it runs only when CACHE_PENDING transitions from set to clear. If that transition already happened while readers was still non-zero, cache_dequeue() will have skipped the request, and no subsequent call will clean it up. Add the same cleanup logic from cache_read() to cache_release(): after decrementing readers, check if it reached 0 with CACHE_PENDING clear, and if so, dequeue and free the cache_request.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 1dfedb293943e491379c9302b428e6f920a73d12 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < f18c1f2a88ca91357916997cdb0f7adaf14fc497 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 7bcd5e318876ac638c8ceade7a648e76ac8c48e1 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 41f6ba6c98a618043d2cd71030bf9a752dfab8b2 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 301670dcd098c1fe5c2fe90fb3c7a8f4814d2351 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < be5c35960e5ead70862736161836e2d1bc7352dc (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 373457de14281c1fc7cace6fc4c8a267fc176673 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 17ad31b3a43b72aec3a3d83605891e1397d0d065 (git)
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Linux Linux Affected: 2.6.12
Unaffected: 0 , < 2.6.12 (semver)
Unaffected: 5.10.253 , ≤ 5.10.* (semver)
Unaffected: 5.15.203 , ≤ 5.15.* (semver)
Unaffected: 6.1.167 , ≤ 6.1.* (semver)
Unaffected: 6.6.130 , ≤ 6.6.* (semver)
Unaffected: 6.12.78 , ≤ 6.12.* (semver)
Unaffected: 6.18.20 , ≤ 6.18.* (semver)
Unaffected: 6.19.10 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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          {
            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nsunrpc: corregir fuga de cache_request en cache_release\n\nCuando el descriptor de archivo de un lector se cierra mientras est\u00e1 en medio de la lectura de un cache_request (rp -\u003e offset != 0), cache_release() decrementa el contador de lectores de la solicitud pero nunca verifica si deber\u00eda liberar la solicitud.\n\nEn cache_read(), cuando los lectores caen a 0 y CACHE_PENDING est\u00e1 despejado, el cache_request se elimina de la cola y se libera junto con su b\u00fafer y la referencia a cache_head. cache_release() carece de esta limpieza.\n\nLa \u00fanica otra ruta que libera solicitudes con lectores == 0 es cache_dequeue(), pero se ejecuta solo cuando CACHE_PENDING transiciona de establecido a despejado. Si esa transici\u00f3n ya ocurri\u00f3 mientras los lectores a\u00fan no eran cero, cache_dequeue() habr\u00e1 omitido la solicitud, y ninguna llamada posterior la limpiar\u00e1.\n\nA\u00f1adir la misma l\u00f3gica de limpieza de cache_read() a cache_release(): despu\u00e9s de decrementar los lectores, verificar si lleg\u00f3 a 0 con CACHE_PENDING despejado, y si es as\u00ed, desencolar y liberar el cache_request."
          }
        ],
        "id": "CVE-2026-31400",
        "lastModified": "2026-07-24T22:10:00.140",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 5.5,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 3.6,
              "source": "nvd@nist.gov",
              "type": "Primary"
            }
          ]
        },
        "published": "2026-04-03T16:16:38.623",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/17ad31b3a43b72aec3a3d83605891e1397d0d065"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/1dfedb293943e491379c9302b428e6f920a73d12"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/301670dcd098c1fe5c2fe90fb3c7a8f4814d2351"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/373457de14281c1fc7cace6fc4c8a267fc176673"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/41f6ba6c98a618043d2cd71030bf9a752dfab8b2"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/7bcd5e318876ac638c8ceade7a648e76ac8c48e1"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/be5c35960e5ead70862736161836e2d1bc7352dc"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/f18c1f2a88ca91357916997cdb0f7adaf14fc497"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Analyzed",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-401"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-28T07:25:01+00:00",
      "cve": "CVE-2026-31400",
      "id": "CVE-2026-31400",
      "initial_release_date": "2026-04-03T00:00:00+00:00",
      "product_status:known_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: sunrpc: fix cache_request leak in cache_release",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-31400.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-07-15T05:23:21Z",
      "cve": "CVE-2026-31400",
      "id": "CVE-2026-31400",
      "initial_release_date": "2026-04-03T23:25:46Z",
      "product_status:first_fixed": "2",
      "product_status:known_not_affected": "210",
      "product_status:recommended": "298",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-31400",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-31400.json",
      "version": "11"
    }
  }
}



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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.


Detection rules are retrieved from Rulezet.


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.