{"id":"CVE-2026-89803","published":"2026-09-16T11:16:45.227","lastModified":"2026-09-16T15:18:09.993","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/nouveau: unsubscribe the channel-kill event before the fence context\n\nnouveau_channel_del() tears the fence context down first and only drops\nthe channel-kill subscription later, in the middle of the nvif object\nteardown:\n\n\tif (chan->fence)\n\t\tnouveau_fence(chan->cli->drm)->context_del(chan);\n\t...\n\tnvif_object_dtor(&chan->vram);\n\tnvif_event_dtor(&chan->kill);\n\nThe subscribed handler is nouveau_channel_killed(), which calls\nnouveau_channel_kill() and from there nouveau_fence_context_kill() on\nchan->fence. A kill event delivered in that window takes fctx->lock and\nwalks fctx->pending on a fence context that context_del() has already\nfreed.\n\nNothing reaches this below Fermi today, because the subscription is\ngated on FERMI_CHANNEL_GPFIFO and nothing kills a channel there. On\nFermi and newer the window is real but narrow, since a kill has to land\nexactly while the channel is being destroyed. That is reason enough on\nits own, which is why this carries a Fixes: tag. The last patch in this\nseries subscribes Tesla channels as well; nothing kills those today, so\nit does not widen the exposure now, but it is the groundwork for a\nrecovery path that would, and the ordering is better fixed before that\nlands than alongside it.\n\nDrop the subscription before anything it depends on is torn down.","cvssScore":7.8,"cvssSeverity":"HIGH","cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cwes":[],"vendors":[],"products":[],"references":[{"url":"https://git.kernel.org/stable/c/1fef7553dc628295c1208a4f2ac2094c62886e5d","tags":[]},{"url":"https://git.kernel.org/stable/c/511585987d27d8cb668acebd399fc4deda23404c","tags":[]},{"url":"https://git.kernel.org/stable/c/f3830fdd6930e233d727f29eee1617f7e6a0e9e5","tags":[]},{"url":"https://git.kernel.org/stable/c/f5a79a9ebfbafb87ca7a896e8d6b5f33a98d097e","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":{"summary":"This vulnerability in the Linux kernel's Nouveau driver allows an attacker to cause a use-after-free condition by delivering a kill event during the channel teardown process, potentially leading to a denial of service or other kernel crashes.","exploitability":"Exploitation requires precise timing and knowledge of the driver's internal state. It is highly technical and would likely only be feasible for advanced attackers with deep knowledge of the Nouveau driver and Linux kernel.","blast_radius":"If exploited, this could lead to a denial of service for the affected system, potentially impacting services running on the affected GPU or the entire system.","remediation":"Upgrade to the fixed version 5.10.144 or later.","detection":"No reliable host or network indicator is derivable from the published description.","tags":["dos","kernel","nouveau","linux"],"model":"qwen2.5:7b-instruct","analyzedAt":"2026-10-09T08:44:53.074Z"}}