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CVE-2026-53137

7.8 · HIGH

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,…

Published Jun 25, 2026CWE-787EPSS 0.14%

Overview

CVE-2026-53137 is a high-severity vulnerability. It was published on June 25, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical 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)

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/1906064d50d194a145486e5caf3db3e708b6f6efRefgit.kernel.org/stable/c/3c4444aec06c74fbc05661f370954ac814963c38Refgit.kernel.org/stable/c/79e0273272a05fb26f9b1e55bf1a52eefc3b7b35Refgit.kernel.org/stable/c/91fb41218c413989d8b6c837748751454b452d68Refgit.kernel.org/stable/c/964e50ef7b8f09815a7d05b8326af700f8d5bc96Refgit.kernel.org/stable/c/98cfb7530ea91d8e5e928285cdce58e1131f6e83Refgit.kernel.org/stable/c/bfba882cfcd08f6540f72f48e786b6404f5d2c5bRefgit.kernel.org/stable/c/f0f3981c43b32cadfe373d636d9e9ca522bb3702

How CyberStrike helps

Frequently asked questions

What is CVE-2026-53137?

CVE-2026-53137 is a high-severity vulnerability. It was published on June 25, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-53137?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-53137?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-53137?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-53137 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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