CVE-2024-46683

{"id": "CVE-2024-46683", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 1.8}]}, "published": "2024-09-13T06:15:12.993", "references": [{"url": "https://git.kernel.org/stable/c/10081b0b0ed201f53e24bd92deb2e0f3c3e713d4", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/730b72480e29f63fd644f5fa57c9d46109428953", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "CWE-416"}]}], "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't\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. Sin embargo, actualmente parece que le enviamos una se\u00f1al a la cerca y luego descartamos la referencia de la cola, pero si algo est\u00e1 esperando en la cerca, el que espera es expulsado para que se despierte en alg\u00fan momento posterior, donde al despertarse primero toma el bloqueo antes de verificar el estado de la cerca. Pero si ya descartamos la referencia de la cola, entonces el bloqueo ya podr\u00eda estar liberado como parte de la cola, lo que lleva a uaf. Para evitar esto, mueva el bloqueo de la cerca a la cerca misma para que no nos encontremos con problemas de duraci\u00f3n de vida. La alternativa podr\u00eda ser tener un bloqueo a nivel de dispositivo, o solo liberar la cola en la devoluci\u00f3n de llamada de liberaci\u00f3n de la cerca, sin embargo, eso podr\u00eda requerir enviar a otro trabajador para evitar problemas de bloqueo. Referencias: https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/2454 Referencias: https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/2342 Referencias: https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/2020 (seleccionada del commit 7116c35aacedc38be6d15bd21b2fc936eed0008b)"}], "lastModified": "2024-09-13T16:52:14.373", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "2CE718D7-41ED-4D4A-AED5-326C3D4383FB", "versionEndExcluding": "6.10.8", "versionStartIncluding": "6.10"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.11:rc1:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "8B3CE743-2126-47A3-8B7C-822B502CF119"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.11:rc2:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "4DEB27E7-30AA-45CC-8934-B89263EF3551"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.11:rc3:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "E0005AEF-856E-47EB-BFE4-90C46899394D"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.11:rc4:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "39889A68-6D34-47A6-82FC-CD0BF23D6754"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.11:rc5:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "B8383ABF-1457-401F-9B61-EE50F4C61F4F"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}