CVE-2026-23454

Estado: ModificadaAlta (7)—

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

net: mana: fix use-after-free in mana_hwc_destroy_channel() by reordering teardown

A potential race condition exists in mana_hwc_destroy_channel() where hwc->caller_ctx is freed before the HWC's Completion Queue (CQ) and Event Queue (EQ) are destroyed. This allows an in-flight CQ interrupt handler to dereference freed memory, leading to a use-after-free or NULL pointer dereference in mana_hwc_handle_resp().

mana_smc_teardown_hwc() signals the hardware to stop but does not synchronize against IRQ handlers already executing on other CPUs.

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The IRQ synchronization only happens in mana_hwc_destroy_cq() via mana_gd_destroy_eq() -> mana_gd_deregister_irq(). Since this runs after kfree(hwc->caller_ctx), a concurrent mana_hwc_rx_event_handler() can dereference freed caller_ctx (and rxq->msg_buf) in mana_hwc_handle_resp().

Fix this by reordering teardown to reverse-of-creation order: destroy the TX/RX work queues and CQ/EQ before freeing hwc->caller_ctx. This ensures all in-flight interrupt handlers complete before the memory they access is freed.

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Puntuación base: 7

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.12%
Percentil entre todas las CVEs puntuadas: 2
Fecha de la puntuación: 6/10/2026

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.

ExplotaciónT1068 Exploitation for Privilege Escalationprivilege escalation75 %
Impacto principalT1059 Command and Scripting Interpreterexecution60 %

CWE-416 (use-after-free) con acceso local (AV:L), privilegios limitados (PR:L) y sin interacción del usuario permite escalada de privilegios explotando una condición de carrera. El impacto primario es potencial ejecución de código a través del manejador de interrupciones.

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

Execution Prevention Threat Intelligence Program Restrict Web-Based Content Privileged Account Management Limit Software Installation Behavior Prevention on Endpoint

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

CWE-416

Referencias

JSON original (NVD)

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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: mana: fix use-after-free in mana_hwc_destroy_channel() by reordering teardown\n\nA potential race condition exists in mana_hwc_destroy_channel() where\nhwc->caller_ctx is freed before the HWC's Completion Queue (CQ) and\nEvent Queue (EQ) are destroyed. This allows an in-flight CQ interrupt\nhandler to dereference freed memory, leading to a use-after-free or\nNULL pointer dereference in mana_hwc_handle_resp().\n\nmana_smc_teardown_hwc() signals the hardware to stop but does not\nsynchronize against IRQ handlers already executing on other CPUs. The\nIRQ synchronization only happens in mana_hwc_destroy_cq() via\nmana_gd_destroy_eq() -> mana_gd_deregister_irq(). Since this runs\nafter kfree(hwc->caller_ctx), a concurrent mana_hwc_rx_event_handler()\ncan dereference freed caller_ctx (and rxq->msg_buf) in\nmana_hwc_handle_resp().\n\nFix this by reordering teardown to reverse-of-creation order: destroy\nthe TX/RX work queues and CQ/EQ before freeing hwc->caller_ctx. This\nensures all in-flight interrupt handlers complete before the memory they\naccess is freed."
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      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnet: mana: corrige uso después de liberación en mana_hwc_destroy_channel() reordenando el desmantelamiento\n\nExiste una potencial condición de carrera en mana_hwc_destroy_channel() donde hwc -> caller_ctx es liberado antes de que la Cola de Completado (CQ) y la Cola de Eventos (EQ) del HWC sean destruidas. Esto permite a un gestor de interrupciones de CQ en curso desreferenciar memoria liberada, lo que lleva a un uso después de liberación o a una desreferencia de puntero NULL en mana_hwc_handle_resp().\n\nmana_smc_teardown_hwc() le indica al hardware que se detenga pero no se sincroniza con los gestores de IRQ que ya se están ejecutando en otras CPUs. La sincronización de IRQ solo ocurre en mana_hwc_destroy_cq() a través de mana_gd_destroy_eq()  ->  mana_gd_deregister_irq(). Dado que esto se ejecuta después de kfree(hwc -> caller_ctx), un mana_hwc_rx_event_handler() concurrente puede desreferenciar caller_ctx liberado (y rxq -> msg_buf) en mana_hwc_handle_resp().\n\nSolucione esto reordenando el desmantelamiento al orden inverso de creación: destruya las colas de trabajo TX/RX y CQ/EQ antes de liberar hwc -> caller_ctx. Esto asegura que todos los gestores de interrupciones en curso se completen antes de que la memoria a la que acceden sea liberada."
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