CVE-2022-49419

Estado: AnalizadaAlta (7.8)—

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

video: fbdev: vesafb: Fix a use-after-free due early fb_info cleanup

Commit b3c9a924aab6 ("fbdev: vesafb: Cleanup fb_info in .fb_destroy rather than .remove") fixed a use-after-free error due the vesafb driver freeing the fb_info in the .remove handler instead of doing it in .fb_destroy.

This can happen if the .fb_destroy callback is executed after the .remove callback, since the former tries to access a pointer freed by the latter.

But that change didn't take into account that another possible scenario is that .fb_destroy is called before the .remove callback. For example, if no process has the fbdev chardev opened by the time the driver is removed.

Leer descripción completaMostrar menos

If that's the case, fb_info will be freed when unregister_framebuffer() is called, making the fb_info pointer accessed in vesafb_remove() after that to no longer be valid.

To prevent that, move the expression containing the info->par to happen before the unregister_framebuffer() function call.

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: 0.27%
Percentil entre todas las CVEs puntuadas: 17
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 escalation85 %
Impacto principalT1059 Command and Scripting Interpreterexecution70 %

Vulnerabilidad de use-after-free (CWE-416) en kernel Linux que requiere acceso local (AV:L/PR:L). Permite escalada de privilegios o ejecución de código mediante acceso a memoria liberada; impacto de ejecución tras ganancia de privilegios del kernel.

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\nvideo: fbdev: vesafb: Fix a use-after-free due early fb_info cleanup\n\nCommit b3c9a924aab6 (\"fbdev: vesafb: Cleanup fb_info in .fb_destroy rather\nthan .remove\") fixed a use-after-free error due the vesafb driver freeing\nthe fb_info in the .remove handler instead of doing it in .fb_destroy.\n\nThis can happen if the .fb_destroy callback is executed after the .remove\ncallback, since the former tries to access a pointer freed by the latter.\n\nBut that change didn't take into account that another possible scenario is\nthat .fb_destroy is called before the .remove callback. For example, if no\nprocess has the fbdev chardev opened by the time the driver is removed.\n\nIf that's the case, fb_info will be freed when unregister_framebuffer() is\ncalled, making the fb_info pointer accessed in vesafb_remove() after that\nto no longer be valid.\n\nTo prevent that, move the expression containing the info->par to happen\nbefore the unregister_framebuffer() function call."
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      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: video: fbdev: vesafb: Fix a use-after-free due early fb_info cleanup Commit b3c9a924aab6 (\"fbdev: vesafb: Cleanup fb_info in .fb_destroy rather than .remove\") corrigió un error de use-after-free debido a que el controlador vesafb liberaba fb_info en el controlador .remove en lugar de hacerlo en .fb_destroy. Esto puede suceder si la devolución de llamada .fb_destroy se ejecuta después de la devolución de llamada .remove, ya que la primera intenta acceder a un puntero liberado por la segunda. Pero ese cambio no tuvo en cuenta que otro escenario posible es que se llame a .fb_destroy antes de la devolución de llamada .remove. Por ejemplo, si ningún proceso tiene abierto el fbdev chardev en el momento en que se elimina el controlador. Si ese es el caso, fb_info se liberará cuando se llame a unregister_framebuffer(), lo que hará que el puntero fb_info al que se accedió en vesafb_remove() después de eso ya no sea válido. Para evitarlo, mueva la expresión que contiene info-&gt;par para que suceda antes de la llamada a la función unregister_framebuffer()."
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