CVE-2026-52987 drm/amdgpu: avoid double drm_exec_fini() in userq validate
A double free vulnerability in the amdgpu driver allows local attackers to cause a system crash or potential memory corruption via specific user queue validation paths.
- 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-2026-52987?
CVE-2026-52987 is a high-severity use after free vulnerability in Linux kernel, published on 24 Jun 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/amdgpu: avoid double drm_exec_fini() in userq validate
When new_addition is true, amdgpu_userq_vm_validate() calls drm_exec_fini(&exec) before iterating over the collected HMM ranges and calling amdgpu_ttm_tt_get_user_pages().
If amdgpu_ttm_tt_get_user_pages() fails in that path, the code jumps to unlock_all and calls drm_exec_fini(&exec) a second time on the same exec object. drm_exec_fini() is not idempotent: it frees exec->objects and may also drop exec->contended and finalize the ww acquire context.
Route that error path directly to the range cleanup once exec has already been finalized.
Issue found using a prototype static analysis tool and confirmed by code review.
(cherry picked from commit 2802952e4a07306da6ebe813ff1acacc5691851a)
Weakness: CWE-1341
Which versions are affected by CVE-2026-52987?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-52987?
Apply the vendor's patch.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2026-52987 being exploited?
There is no known exploitation of CVE-2026-52987 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as DEBIAN-CVE-2026-52987, GHSA-j5vg-4jfw-25g2, UBUNTU-CVE-2026-52987.