CVE-2026-63885 drm/gem: fix race between change_handle and handle_delete
A race condition in the Linux kernel DRM subsystem allows attackers to trigger a use-after-free, potentially leading to code execution or privilege escalation.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-63885?
CVE-2026-63885 is a high-severity vulnerability in Linux kernel, published on 19 Jul 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
drm/gem: fix race between change_handle and handle_delete
drm_gem_change_handle_ioctl leaves the old handle live in the IDR during the window between spin_unlock(table_lock) and the final spin_lock(table_lock). A concurrent drm_gem_handle_delete on the old handle succeeds in this window, decrements handle_count to 0, and frees the GEM object while the new handle's IDR entry still references it.
NULL the old handle's IDR entry before dropping table_lock so that any concurrent GEM_CLOSE on the old handle sees NULL and returns -EINVAL. Restore the old entry on the prime-bookkeeping error path.
Weakness: CWE-362
Which versions are affected by CVE-2026-63885?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-63885?
Apply the vendor's patch.
Is CVE-2026-63885 being exploited?
There is no known exploitation of CVE-2026-63885 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2026-63885, DEBIAN-CVE-2026-63885, GHSA-6335-2wvm-xv3c, UBUNTU-CVE-2026-63885.