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CVE-2024-50186

Estado: ModificadaAlta (7.8)—

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

net: explicitly clear the sk pointer, when pf->create fails

We have recently noticed the exact same KASAN splat as in commit 6cd4a78d962b ("net: do not leave a dangling sk pointer, when socket creation fails"). The problem is that commit did not fully address the problem, as some pf->create implementations do not use sk_common_release in their error paths.

For example, we can use the same reproducer as in the above commit, but changing ping to arping. arping uses AF_PACKET socket and if packet_create fails, it will just sk_free the allocated sk object.

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While we could chase all the pf->create implementations and make sure they NULL the freed sk object on error from the socket, we can't guarantee future protocols will not make the same mistake.

So it is easier to just explicitly NULL the sk pointer upon return from pf->create in __sock_create. We do know that pf->create always releases the allocated sk object on error, so if the pointer is not NULL, it is definitely dangling.

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 de use-after-free (CWE-416) en socket creation con permisos de usuario (PR:L). Permite escalada de privilegios y ejecución de código arbitrario mediante manipulación de punteros dangling en 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 PreventionThreat Intelligence ProgramRestrict Web-Based ContentPrivileged Account ManagementLimit Software InstallationBehavior Prevention on Endpoint

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: explicitly clear the sk pointer, when pf->create fails\n\nWe have recently noticed the exact same KASAN splat as in commit\n6cd4a78d962b (\"net: do not leave a dangling sk pointer, when socket\ncreation fails\"). The problem is that commit did not fully address the\nproblem, as some pf->create implementations do not use sk_common_release\nin their error paths.\n\nFor example, we can use the same reproducer as in the above commit, but\nchanging ping to arping. arping uses AF_PACKET socket and if packet_create\nfails, it will just sk_free the allocated sk object.\n\nWhile we could chase all the pf->create implementations and make sure they\nNULL the freed sk object on error from the socket, we can't guarantee\nfuture protocols will not make the same mistake.\n\nSo it is easier to just explicitly NULL the sk pointer upon return from\npf->create in __sock_create. We do know that pf->create always releases the\nallocated sk object on error, so if the pointer is not NULL, it is\ndefinitely dangling."
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      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net: borrar explícitamente el puntero sk, cuando pf->create falla Recientemente hemos notado exactamente el mismo splat de KASAN que en el commit 6cd4a78d962b (\"net: no deje un puntero sk colgando, cuando falla la creación del socket\"). El problema es que el commit no solucionó completamente el problema, ya que algunas implementaciones de pf->create no usan sk_common_release en sus rutas de error. Por ejemplo, podemos usar el mismo reproductor que en el commit anterior, pero cambiando ping a arping. arping usa el socket AF_PACKET y si packet_create falla, solo sk_free el objeto sk asignado. Si bien podríamos perseguir todas las implementaciones de pf->create y asegurarnos de que anulen el objeto sk liberado en caso de error del socket, no podemos garantizar que los protocolos futuros no cometan el mismo error. Por lo tanto, es más fácil simplemente convertir explícitamente en NULL el puntero sk al regresar de pf->create en __sock_create. Sabemos que pf->create siempre libera el objeto sk asignado en caso de error, por lo que si el puntero no es NULL, definitivamente está colgado."
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