CVE-2025-21985 drm/amd/display: Fix out-of-bound accesses
An out-of-bounds access in the AMD display driver allows attackers to cause memory corruption, potentially leading to system crashes or arbitrary code execution.
- 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-2025-21985?
CVE-2025-21985 is a high-severity memory corruption 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 out-of-bound accesses
[WHAT & HOW] hpo_stream_to_link_encoder_mapping has size MAX_HPO_DP2_ENCODERS(=4), but location can have size up to 6. As a result, it is necessary to check location against MAX_HPO_DP2_ENCODERS.
Similiarly, disp_cfg_stream_location can be used as an array index which should be 0..5, so the ASSERT's conditions should be less without equal.
Weakness: CWE-125
Which versions are affected by CVE-2025-21985?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2025-21985?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2025-21985 being exploited?
There is no known exploitation of CVE-2025-21985 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-62672, BELL-CVE-2025-21985, DEBIAN-CVE-2025-21985, GHSA-6hmr-pwgj-w283, ROOT-OS-DEBIAN-11-CVE-2025-21985, ROOT-OS-DEBIAN-12-CVE-2025-21985 and 3 more.