CVE-2026-53137

drm/amd/display: Clamp HDMI HDCP2 rx_id_list read to buffer size

State: Published
Severity: Not scored
Published: Jun 25, 2026
Updated: Jun 25, 2026
Reserved: Jun 9, 2026

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)

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	eff682f83c9c2030761e7536c5d97e1b20f71c15 to before 3c4444aec06c74fbc05661f370954ac814963c38Affected eff682f83c9c2030761e7536c5d97e1b20f71c15 to before 91fb41218c413989d8b6c837748751454b452d68Affected eff682f83c9c2030761e7536c5d97e1b20f71c15 to before 964e50ef7b8f09815a7d05b8326af700f8d5bc96Affected eff682f83c9c2030761e7536c5d97e1b20f71c15 to before 79e0273272a05fb26f9b1e55bf1a52eefc3b7b35Affected eff682f83c9c2030761e7536c5d97e1b20f71c15 to before bfba882cfcd08f6540f72f48e786b6404f5d2c5bAffected eff682f83c9c2030761e7536c5d97e1b20f71c15 to before 1906064d50d194a145486e5caf3db3e708b6f6efAffected eff682f83c9c2030761e7536c5d97e1b20f71c15 to before 98cfb7530ea91d8e5e928285cdce58e1131f6e83Affected eff682f83c9c2030761e7536c5d97e1b20f71c15 to before f0f3981c43b32cadfe373d636d9e9ca522bb3702Affected
LinuxLinux	5.6Affected before 5.6Not affected 5.10.259 through 5.10.Not affected 5.15.210 through 5.15.Not affected 6.1.176 through 6.1.Not affected 6.6.143 through 6.6.Not affected 6.12.94 through 6.12.Not affected 6.18.36 through 6.18.Not affected 7.0.13 through 7.0.*Not affected 7.1 and laterNot affected

Product

Versions

LinuxLinux

eff682f83c9c2030761e7536c5d97e1b20f71c15 to before 3c4444aec06c74fbc05661f370954ac814963c38Affected
eff682f83c9c2030761e7536c5d97e1b20f71c15 to before 91fb41218c413989d8b6c837748751454b452d68Affected
eff682f83c9c2030761e7536c5d97e1b20f71c15 to before 964e50ef7b8f09815a7d05b8326af700f8d5bc96Affected
eff682f83c9c2030761e7536c5d97e1b20f71c15 to before 79e0273272a05fb26f9b1e55bf1a52eefc3b7b35Affected
eff682f83c9c2030761e7536c5d97e1b20f71c15 to before bfba882cfcd08f6540f72f48e786b6404f5d2c5bAffected
eff682f83c9c2030761e7536c5d97e1b20f71c15 to before 1906064d50d194a145486e5caf3db3e708b6f6efAffected
eff682f83c9c2030761e7536c5d97e1b20f71c15 to before 98cfb7530ea91d8e5e928285cdce58e1131f6e83Affected
eff682f83c9c2030761e7536c5d97e1b20f71c15 to before f0f3981c43b32cadfe373d636d9e9ca522bb3702Affected

LinuxLinux

5.6Affected
before 5.6Not affected
5.10.259 through 5.10.*Not affected
5.15.210 through 5.15.*Not affected
6.1.176 through 6.1.*Not affected
6.6.143 through 6.6.*Not affected
6.12.94 through 6.12.*Not affected
6.18.36 through 6.18.*Not affected
7.0.13 through 7.0.*Not affected
7.1 and laterNot affected

References

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