CVE-2026-64219 drm/amd/display: Validate payload length and link_index in dc_process_dmub_aux_transfer_async
A stack buffer overflow in the Linux kernel's AMD display driver allows attackers to execute arbitrary code or escalate privileges via crafted payload lengths.
- 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-2026-64219?
CVE-2026-64219 is a high-severity memory corruption vulnerability in Linux kernel, published on 24 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/amd/display: Validate payload length and link_index in dc_process_dmub_aux_transfer_async
[Why&How] dc_process_dmub_aux_transfer_async() copies payload->length bytes into a 16-byte stack buffer (dpaux.data[16]) guarded only by an ASSERT(), which is a no-op in release builds. If a caller ever passes length > 16 this results in a stack buffer overflow via memcpy.
Additionally, link_index is used to dereference dc->links[] without bounds checking against dc->link_count, risking an out-of-bounds access.
Replace the ASSERT with a hard runtime check that returns false when payload->length exceeds the destination buffer size, and add a bounds check for link_index before it is used.
(cherry picked from commit ba4caa9fecdf7a38f98c878ad05a8a64148b6881)
Which versions are affected by CVE-2026-64219?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-64219?
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-2026-64219 being exploited?
There is no known exploitation of CVE-2026-64219 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2026-64219, DEBIAN-CVE-2026-64219, GHSA-gjfp-5cfr-xp55, ROOT-OS-UBUNTU-2204-CVE-2026-64219, UBUNTU-CVE-2026-64219.