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CVE-2024-50036

Estado: ModificadaAlta (7)—

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

net: do not delay dst_entries_add() in dst_release()

dst_entries_add() uses per-cpu data that might be freed at netns dismantle from ip6_route_net_exit() calling dst_entries_destroy()

Before ip6_route_net_exit() can be called, we release all the dsts associated with this netns, via calls to dst_release(), which waits an rcu grace period before calling dst_destroy()

dst_entries_add() use in dst_destroy() is racy, because dst_entries_destroy() could have been called already.

Decrementing the number of dsts must happen sooner.

Notes:

Detalles técnicos trazas, registros y código del informe original
1) in CONFIG_XFRM case, dst_destroy() can call
   dst_release_immediate(child), this might also cause UAF
   if the child does not have DST_NOCOUNT set.
   IPSEC maintainers might take a look and see how to address this.

2) There is also discussion about removing this count of dst,
   which might happen in future kernels.

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 local (AV:L) con PR:L que causa use-after-free en gestión de memoria del kernel. Permite DoS por corrupción de datos de red o crash del sistema desde cuenta no privilegiada.

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)

Mostrar
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      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net: no retrasar dst_entries_add() en dst_release() dst_entries_add() usa datos por CPU que podrían liberarse en el desmantelamiento de netns de ip6_route_net_exit() llamando a dst_entries_destroy() Antes de que se pueda llamar a ip6_route_net_exit(), liberamos todos los dst asociados con este netns, a través de llamadas a dst_release(), que espera un período de gracia de rcu antes de llamar a dst_destroy() El uso de dst_entries_add() en dst_destroy() es arriesgado, porque dst_entries_destroy() ya podría haberse llamado. La disminución del número de dst debe ocurrir antes. Notas: 1) en el caso de CONFIG_XFRM, dst_destroy() puede llamar a dst_release_immediate(child), lo que también podría causar UAF si el hijo no tiene DST_NOCOUNT configurado. Los encargados del mantenimiento de IPSEC podrían echar un vistazo y ver cómo solucionar esto. 2) También se está discutiendo sobre la eliminación de este recuento de dst, lo que podría suceder en kernels futuros."
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