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CVE-2022-48985

Estado: ModificadaMedia (4.7)—

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

net: mana: Fix race on per-CQ variable napi work_done

After calling napi_complete_done(), the NAPIF_STATE_SCHED bit may be cleared, and another CPU can start napi thread and access per-CQ variable, cq->work_done. If the other thread (for example, from busy_poll) sets it to a value >= budget, this thread will continue to run when it should stop, and cause memory corruption and panic.

To fix this issue, save the per-CQ work_done variable in a local variable before napi_complete_done(), so it won't be corrupted by a possible concurrent thread after napi_complete_done().

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Also, add a flag bit to advertise to the NIC firmware: the NAPI work_done variable race is fixed, so the driver is able to reliably support features like busy_poll.

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 (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: mana: Fix race on per-CQ variable napi work_done\n\nAfter calling napi_complete_done(), the NAPIF_STATE_SCHED bit may be\ncleared, and another CPU can start napi thread and access per-CQ variable,\ncq->work_done. If the other thread (for example, from busy_poll) sets\nit to a value >= budget, this thread will continue to run when it should\nstop, and cause memory corruption and panic.\n\nTo fix this issue, save the per-CQ work_done variable in a local variable\nbefore napi_complete_done(), so it won't be corrupted by a possible\nconcurrent thread after napi_complete_done().\n\nAlso, add a flag bit to advertise to the NIC firmware: the NAPI work_done\nvariable race is fixed, so the driver is able to reliably support features\nlike busy_poll."
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      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net: mana: Corregir ejecución en la variable per-CQ napi work_done Después de llamar a napi_complete_done(), el bit NAPIF_STATE_SCHED puede borrarse, y otra CPU puede iniciar el hilo napi y acceder a la variable per-CQ, cq->work_done. Si el otro hilo (por ejemplo, desde busy_poll) lo establece en un valor >= budget, este hilo seguirá ejecutándose cuando debería detenerse, y provocará corrupción de memoria y pánico. Para solucionar este problema, guarde la variable per-CQ work_done en una variable local antes de napi_complete_done(), para que no se corrompa por un posible hilo concurrente después de napi_complete_done(). Además, agregue un bit de bandera para anunciar al firmware NIC: la ejecución de la variable NAPI work_done está fija, por lo que el controlador puede soportar de forma fiable funciones como busy_poll."
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