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CVE-2023-4208

Estado: ModificadaAlta (7.8)—

Una vulnerabilidad de Use After Free en el componente net/sched: cls_u32 del kernel de Linux puede ser explotada para conseguir una escalada local de privilegios. Cuando se llama a u32_change() en un filtro existente, toda la estructura tcf_result se copia siempre en la nueva instancia del filtro. Esto causa un problema cuando se actualiza un filtro vinculado a una clase, ya que tcf_unbind_filter() siempre llama a la instancia antigua en la ruta de éxito, disminuyendo filter_cnt de la clase aún referenciada y permitiendo que se elimine, lo que lleva a un Use After Free. Recomendamos actualizar el commit a partir de 3044b16e7c6fe5d24b1cdbcf1bd0a9d92d1ebd81.

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 (2)

Debian — Debian LinuxLinux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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      "value": "A use-after-free vulnerability in the Linux kernel's net/sched: cls_u32 component can be exploited to achieve local privilege escalation.\n\nWhen u32_change() is called on an existing filter, the whole tcf_result struct is always copied into the new instance of the filter. This causes a problem when updating a filter bound to a class, as tcf_unbind_filter() is always called on the old instance in the success path, decreasing filter_cnt of the still referenced class and allowing it to be deleted, leading to a use-after-free.\n\nWe recommend upgrading past commit 3044b16e7c6fe5d24b1cdbcf1bd0a9d92d1ebd81."
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  "lastModified": "2026-06-17T06:37:19.093",
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