CVE-2026-53137 drm/amd/display: Clamp HDMI HDCP2 rx_id_list read to buffer size
A malicious HDMI repeater can trigger an out-of-bounds write in the Linux kernel's AMD display driver, 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-2026-53137?
CVE-2026-53137 is a high-severity memory corruption vulnerability in Linux kernel, published on 25 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/amd/display: Clamp HDMI HDCP2 rx_id_list read to buffer size
[Why & How] During HDCP 2.x repeater authentication over HDMI, the driver reads the sink's RxStatus register and extracts a 10-bit message size field (max value 1023). This value is used as the read length for the ReceiverID list without being clamped to the size of the destination buffer rx_id_list[177]. A malicious HDMI repeater could advertise a message size larger than the buffer, causing an out-of-bounds write during the I2C read.
Clamp the read length in mod_hdcp_read_rx_id_list() to the size of the rx_id_list buffer, matching the approach already used in the DP branch.
(cherry picked from commit 229212219e4247d9486f8ba41ef087358490be09)
Weakness: CWE-787
Which versions are affected by CVE-2026-53137?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-53137?
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-2026-53137 being exploited?
There is no known exploitation of CVE-2026-53137 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-90575, BELL-CVE-2026-53137, DEBIAN-CVE-2026-53137, GHSA-36gr-gw56-g35v, ROOT-OS-DEBIAN-11-CVE-2026-53137, ROOT-OS-DEBIAN-12-CVE-2026-53137 and 3 more.