CVE-2026-53137: linux Out-of-bounds Write

Vulnerability summary

CVE-2026-53137 is a high (CVSS 7.8) Out-of-bounds Write vulnerability in linux. EPSS estimates a 0.14% chance of exploitation in the next 30 days, higher than 3.2% of scored vulnerabilities.

Timeline

1. 25-06-2026
   PublishedVulnerability first disclosed.

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)

• CWE-787Out-of-bounds WriteThe product writes data past the end, or before the beginning, of the intended buffer.