drm/nouveau: RCU-free the scheduler-containing nouveau_sched
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 6.12.112, 6.18.55, 7.2.9
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
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().
Timeline
- CVE published
- Record last updated
Affected versions
- Linux Linux
From 5f03a507b29e44a848f315c7240c19894dd8be4f · fixed in 40edf5eefc3fd94592a91d6eb074d4fc6f606c75; From 5f03a507b29e44a848f315c7240c19894dd8be4f · fixed in 35151e9a8274174ccbb92e3b3ba7dc7a008dcada; From 5f03a507b29e44a848f315c7240c19894dd8be4f · fixed in cd6e11b6ebe04a0a1f1435df561acada9eadc563; From 5f03a507b29e44a848f315c7240c19894dd8be4f · fixed in f7eae6d8d768fabd6b59779ca7da79e02c74e113
- Linux Linux
6.8
- KernelLinux
From 6.8.0 · fixed in 6.12.112; From 6.13.0 · fixed in 6.18.55; From 6.19.0 · fixed in 7.2.9