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CVE-2026-64265

Estado: AnalizadaAlta (7.8)—

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

fuse: clear intr_entry in fuse_resend and fuse_remove_pending_req

When fuse_resend() moves a request from fpq->processing back to fiq->pending, it sets FR_PENDING and clears FR_SENT but does not remove the requests intr_entry from fiq->interrupts. If the request had FR_INTERRUPTED set from a prior signal, intr_entry remains dangling on fiq->interrupts.

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When the requesting task then receives a fatal signal, fuse_remove_pending_req() sees FR_PENDING=1, removes the request from fiq->pending and frees it via the refcount path, also without cleaning intr_entry. The stale intr_entry causes use-after-free when fuse_read_interrupt() iterates fiq->interrupts: - list_del_init(&req->intr_entry) -> UAF write on freed slab - req->in.h.unique -> UAF read, data leaked to userspace

Remove intr_entry from fiq->interrupts in fuse_resend() for interrupted requests before they are placed back on fiq->pending.

Add a WARN_ON if the intr_entry is not empty on request destruction.

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).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

Vulnerabilidad de Use-After-Free (CWE-416) en kernel Linux con acceso local (AV:L) y privilegios mínimos (PR:L) sin interacción del usuario. Permite lectura de datos en memoria (UAF read) y denegación de servicio mediante corrupción de memoria (UAF write). Explotación para escalada/abuso de privileg

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Threat Intelligence ProgramFilter Network TrafficExecution PreventionApplication Isolation and SandboxingExploit ProtectionUpdate Software

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfuse: clear intr_entry in fuse_resend and fuse_remove_pending_req\n\nWhen fuse_resend() moves a request from fpq->processing back to\nfiq->pending, it sets FR_PENDING and clears FR_SENT but does not\nremove the requests intr_entry from fiq->interrupts.  If the\nrequest had FR_INTERRUPTED set from a prior signal, intr_entry\nremains dangling on fiq->interrupts.  When the requesting task\nthen receives a fatal signal, fuse_remove_pending_req() sees\nFR_PENDING=1, removes the request from fiq->pending and frees it\nvia the refcount path, also without cleaning intr_entry.  The\nstale intr_entry causes use-after-free when fuse_read_interrupt()\niterates fiq->interrupts:\n  - list_del_init(&req->intr_entry) -> UAF write on freed slab\n  - req->in.h.unique -> UAF read, data leaked to userspace\n\nRemove intr_entry from fiq->interrupts in fuse_resend() for\ninterrupted requests before they are placed back on fiq->pending.\n\nAdd a WARN_ON if the intr_entry is not empty on request destruction."
    }
  ],
  "lastModified": "2026-08-17T05:17:25.277",
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