CVE-2025-21968 drm/amd/display: Fix slab-use-after-free on hdcp_work
A use-after-free in the Linux kernel's AMD display driver allows attackers to cause denial of service or execute code via HDCP destruction.
- 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-2025-21968?
CVE-2025-21968 is a high-severity use after free vulnerability in Linux kernel, published on 1 Apr 2025. 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/amd/display: Fix slab-use-after-free on hdcp_work
[Why] A slab-use-after-free is reported when HDCP is destroyed but the property_validate_dwork queue is still running.
[How] Cancel the delayed work when destroying workqueue.
(cherry picked from commit 725a04ba5a95e89c89633d4322430cfbca7ce128)
Weakness: CWE-416
Which versions are affected by CVE-2025-21968?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2025-21968?
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-2025-21968 being exploited?
There is no known exploitation of CVE-2025-21968 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2025-21968, DEBIAN-CVE-2025-21968, GHSA-rvg2-pv9x-xxhg, ROOT-OS-UBUNTU-2404-CVE-2025-21968, UBUNTU-CVE-2025-21968.