CVE-2026-98512

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

drm/nouveau: RCU-free the scheduler-containing nouveau_sched

struct nouveau_sched embeds a struct drm_gpu_scheduler (base).

nouveau_sched_destroy() calls nouveau_sched_fini() (which does

drm_sched_fini(&sched->base)) and then frees the object with plain

kfree(sched).

drm_sched_fence_get_timeline_name() returns fence->sched->name, and the

scheduler fence keeps a .release callback so it is not ops-detached on

signalling. A finished fence exported to userspace via drm_syncobj /

sync_file therefore keeps pointing at &sched->base after nouveau_sched_destroy(),

and a later get_timeline_name() -- reachable unprivileged through

SYNC_IOC_FILE_INFO -- dereferences freed memory (KASAN slab-use-after-free

read).

Per the dma-fence lifetime contract the exporter must keep the data backing a

signalled fence alive for an RCU grace period. Free the scheduler-containing

object with kfree_rcu() instead of kfree().