Description (CNA)
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().
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 5f03a507b29e44a848f315c7240c19894dd8be4f before 40edf5eefc3fd94592a91d6eb074d4fc6f606c75; affected 5f03a507b29e44a848f315c7240c19894dd8be4f before 35151e9a8274174ccbb92e3b3ba7dc7a008dcada; affected 5f03a507b29e44a848f315c7240c19894dd8be4f before cd6e11b6ebe04a0a1f1435df561acada9eadc563; affected 5f03a507b29e44a848f315c7240c19894dd8be4f before f7eae6d8d768fabd6b59779ca7da79e02c74e113 |
| Linux / Linux | affected 6.8; unaffected 0 before 6.8; unaffected 6.12.112 through 6.12.*; unaffected 6.18.55 through 6.18.*; unaffected 7.2.9 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.