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CVE-2026-31400

Estado: AnalizadaMedia (5.5)—

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.

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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.

CVSS

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)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsunrpc: fix cache_request leak in cache_release\n\nWhen a reader's file descriptor is closed while in the middle of reading\na cache_request (rp->offset != 0), cache_release() decrements the\nrequest's readers count but never checks whether it should free the\nrequest.\n\nIn cache_read(), when readers drops to 0 and CACHE_PENDING is clear, the\ncache_request is removed from the queue and freed along with its buffer\nand cache_head reference. cache_release() lacks this cleanup.\n\nThe only other path that frees requests with readers == 0 is\ncache_dequeue(), but it runs only when CACHE_PENDING transitions from\nset to clear. 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."
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      "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 está en medio de la lectura de un cache_request (rp -> offset != 0), cache_release() decrementa el contador de lectores de la solicitud pero nunca verifica si debería liberar la solicitud.\n\nEn cache_read(), cuando los lectores caen a 0 y CACHE_PENDING está despejado, el cache_request se elimina de la cola y se libera junto con su búfer y la referencia a cache_head. cache_release() carece de esta limpieza.\n\nLa única 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 transición ya ocurrió mientras los lectores aún no eran cero, cache_dequeue() habrá omitido la solicitud, y ninguna llamada posterior la limpiará.\n\nAñadir la misma lógica de limpieza de cache_read() a cache_release(): después de decrementar los lectores, verificar si llegó a 0 con CACHE_PENDING despejado, y si es así, desencolar y liberar el cache_request."
    }
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