CVE-2026-52912

Estado: ModificadaAlta (7.8)—

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

netfilter: nf_queue: hold bridge skb->dev while queued

br_pass_frame_up() rewrites skb->dev from the ingress port to the bridge master before queueing bridge LOCAL_IN packets. NFQUEUE only holds references on state.in/out and bridge physdevs, so a queued bridge packet can retain a freed bridge master in skb->dev until reinjection.

When the verdict is reinjected later, br_netif_receive_skb() re-enters the receive path with skb->dev still pointing at the freed bridge master, triggering a use-after-free.

Store skb->dev in the queue entry, hold a reference on it for the queue lifetime, and use the saved device when dropping queued packets during NETDEV_DOWN handling.

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Puntuación base: 7.8

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.15%
Percentil entre todas las CVEs puntuadas: 4
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 %

Vulnerabilidad local (AV:L, PR:L) de use-after-free (CWE-416) en el kernel Linux sin interacción del usuario. Permite escalada de privilegios explotando la reescritura de skb->dev. El impacto es ejecución de código mediante re-entrada en la ruta de recepción.

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\nnetfilter: nf_queue: hold bridge skb->dev while queued\n\nbr_pass_frame_up() rewrites skb->dev from the ingress port to the bridge\nmaster before queueing bridge LOCAL_IN packets. NFQUEUE only holds\nreferences on state.in/out and bridge physdevs, so a queued bridge\npacket can retain a freed bridge master in skb->dev until reinjection.\n\nWhen the verdict is reinjected later, br_netif_receive_skb() re-enters\nthe receive path with skb->dev still pointing at the freed bridge master,\ntriggering a use-after-free.\n\nStore skb->dev in the queue entry, hold a reference on it for the queue\nlifetime, and use the saved device when dropping queued packets during\nNETDEV_DOWN handling."
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