High 7.8Published Jun 25, 2026

CVE-2026-53137drm/amd/display: Clamp HDMI HDCP2 rx_id_list read to buffer size

Updated under an hour ago (Oct 27, 2026, 10:40 AM ET)

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Exploited in the last 30 days

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)

CVSS: 7.8 HIGH (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Analyzed
Record last updated: Jun 25, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from eff682f83c9c2030761e7536c5d97e1b20f71c15 before 3c4444aec06c74fbc05661f370954ac814963c38; from eff682f83c9c2030761e7536c5d97e1b20f71c15 before 91fb41218c413989d8b6c837748751454b452d68; from eff682f83c9c2030761e7536c5d97e1b20f71c15 before 964e50ef7b8f09815a7d05b8326af700f8d5bc96; from eff682f83c9c2030761e7536c5d97e1b20f71c15 before 79e0273272a05fb26f9b1e55bf1a52eefc3b7b35; from eff682f83c9c2030761e7536c5d97e1b20f71c15 before bfba882cfcd08f6540f72f48e786b6404f5d2c5b; from eff682f83c9c2030761e7536c5d97e1b20f71c15 before 1906064d50d194a145486e5caf3db3e708b6f6ef; from eff682f83c9c2030761e7536c5d97e1b20f71c15 before 98cfb7530ea91d8e5e928285cdce58e1131f6e83; from eff682f83c9c2030761e7536c5d97e1b20f71c15 before f0f3981c43b32cadfe373d636d9e9ca522bb3702	CNA record
linux linux_kernel linux:linux_kernel	from 5.6 before 5.10.259; from 5.11 before 5.15.210; from 5.16 before 6.1.176; from 6.2 before 6.6.143; from 6.7 before 6.12.94; from 6.13 before 6.18.36; from 6.19 before 7.0.13; 7.1; and 5 more ranges	NVD

References

References

https://git.kernel.org/stable/c/3c4444aec06c74fbc05661f370954ac814963c38	patch
https://git.kernel.org/stable/c/91fb41218c413989d8b6c837748751454b452d68	patch
https://git.kernel.org/stable/c/964e50ef7b8f09815a7d05b8326af700f8d5bc96	patch
https://git.kernel.org/stable/c/79e0273272a05fb26f9b1e55bf1a52eefc3b7b35	patch
https://git.kernel.org/stable/c/bfba882cfcd08f6540f72f48e786b6404f5d2c5b	patch
https://git.kernel.org/stable/c/1906064d50d194a145486e5caf3db3e708b6f6ef	patch
https://git.kernel.org/stable/c/98cfb7530ea91d8e5e928285cdce58e1131f6e83	patch
https://git.kernel.org/stable/c/f0f3981c43b32cadfe373d636d9e9ca522bb3702	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.