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
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)
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If that transition already happened while readers was\\nstill non-zero, cache_dequeue() will have skipped the request, and no\\nsubsequent call will clean it up.\\n\\nAdd the same cleanup logic from cache_read() to cache_release(): after\\ndecrementing readers, check if it reached 0 with CACHE_PENDING clear,\\nand if so, dequeue and free the cache_request.\"},{\"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 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    "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.