cve-2024-46683
Vulnerability from cvelistv5
Published
2024-09-13 05:29
Modified
2024-12-19 09:20
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: drm/xe: prevent UAF around preempt fence The fence lock is part of the queue, therefore in the current design anything locking the fence should then also hold a ref to the queue to prevent the queue from being freed. However, currently it looks like we signal the fence and then drop the queue ref, but if something is waiting on the fence, the waiter is kicked to wake up at some later point, where upon waking up it first grabs the lock before checking the fence state. But if we have already dropped the queue ref, then the lock might already be freed as part of the queue, leading to uaf. To prevent this, move the fence lock into the fence itself so we don't run into lifetime issues. Alternative might be to have device level lock, or only release the queue in the fence release callback, however that might require pushing to another worker to avoid locking issues. References: https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/2454 References: https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/2342 References: https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/2020 (cherry picked from commit 7116c35aacedc38be6d15bd21b2fc936eed0008b)
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/10081b0b0ed201f53e24bd92deb2e0f3c3e713d4Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/730b72480e29f63fd644f5fa57c9d46109428953Patch
Impacted products
Vendor Product Version
Linux Linux Version: 6.8
Show details on NVD website

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    "dateReserved": "2024-09-11T15:12:18.248Z",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2024-46683\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-09-13T06:15:12.993\",\"lastModified\":\"2024-09-13T16:52:14.373\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\ndrm/xe: prevent UAF around preempt fence\\n\\nThe fence lock is part of the queue, therefore in the current design\\nanything locking the fence should then also hold a ref to the queue to\\nprevent the queue from being freed.\\n\\nHowever, currently it looks like we signal the fence and then drop the\\nqueue ref, but if something is waiting on the fence, the waiter is\\nkicked to wake up at some later point, where upon waking up it first\\ngrabs the lock before checking the fence state. But if we have already\\ndropped the queue ref, then the lock might already be freed as part of\\nthe queue, leading to uaf.\\n\\nTo prevent this, move the fence lock into the fence itself so we don\u0027t\\nrun into lifetime issues. Alternative might be to have device level\\nlock, or only release the queue in the fence release callback, however\\nthat might require pushing to another worker to avoid locking issues.\\n\\nReferences: https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/2454\\nReferences: https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/2342\\nReferences: https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/2020\\n(cherry picked from commit 7116c35aacedc38be6d15bd21b2fc936eed0008b)\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: drm/xe: evitar UAF alrededor de la cerca de preempci\u00f3n El bloqueo de la cerca es parte de la cola, por lo tanto, en el dise\u00f1o actual, cualquier cosa que bloquee la cerca tambi\u00e9n debe contener una referencia a la cola para evitar que la cola se libere. 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