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)

Metrics

No CVSS v4.0

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00212.

Key SSVC decision points have not yet been added.

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Linux
  • Linux Kernel

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References
Link Providers
https://git.kernel.org/stable/c/1906064d50d194a145486e5caf3db3e708b6f6ef cve-icon
https://git.kernel.org/stable/c/3c4444aec06c74fbc05661f370954ac814963c38 cve-icon
https://git.kernel.org/stable/c/79e0273272a05fb26f9b1e55bf1a52eefc3b7b35 cve-icon
https://git.kernel.org/stable/c/91fb41218c413989d8b6c837748751454b452d68 cve-icon
https://git.kernel.org/stable/c/964e50ef7b8f09815a7d05b8326af700f8d5bc96 cve-icon
https://git.kernel.org/stable/c/98cfb7530ea91d8e5e928285cdce58e1131f6e83 cve-icon
https://git.kernel.org/stable/c/bfba882cfcd08f6540f72f48e786b6404f5d2c5b cve-icon
https://git.kernel.org/stable/c/f0f3981c43b32cadfe373d636d9e9ca522bb3702 cve-icon
History

Thu, 25 Jun 2026 11:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-120

Thu, 25 Jun 2026 09:15:00 +0000

Type Values Removed Values Added
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)
Title drm/amd/display: Clamp HDMI HDCP2 rx_id_list read to buffer size
First Time appeared Linux
Linux linux Kernel
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Vendors & Products Linux
Linux linux Kernel
References
cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2026-06-25T08:38:25.977Z

Reserved: 2026-06-09T07:44:35.387Z

Link: CVE-2026-53137

cve-icon Vulnrichment

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cve-icon NVD

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cve-icon Redhat

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cve-icon OpenCVE Enrichment

Updated: 2026-06-25T11:15:10Z