CVE-2026-53137
HighCVSS 7.8Exploitation Probability (EPSS)
Low risk11th percentile - higher than 11% of all known CVEs
Summary
In the Linux kernel, the AMD Display driver lacks clamping of the ReceiverID list read size during HDCP 2.x authentication over HDMI. A malicious HDMI repeater can advertise a message size larger than the destination buffer, causing an out-of-bounds write.
Risk Assessment
An attacker could exploit this vulnerability to write beyond the allocated kernel memory, potentially leading to privilege escalation, data leakage, or system crash.
Recommendation
Immediately update the Linux kernel to a version containing commit 229212219e4247d9486f8ba41ef087358490be09 or later, which clamps the read length to the buffer size.
Original NVD description (English source)
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)