VulnerabilityPublished 25 Jun 2026Updated 6 Nov 2026

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

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in f0f3981c43b32cadfe373d636d9e9ca522bb3702 : update Linux kernel when convenient.

Data as of 6 Nov 2026, 16:34 UTC

Severity

Unrated

Rated by Threat Radar · No CVSS score from NVD or the CNA

Thin evidence

One scorer or none

Exploitation: No evidence of active exploitation and no public proof of concept
Automatable: Attackers cannot reliably automate steps 1–4 of the kill chain
Technical impact: Limited control over the software or limited information exposure

CISA SSVC assessment, 2026-11-06.

Patch

Available – fixed in f0f3981c43b32cadfe373d636d9e9ca522bb3702, bfba882cfcd08f6540f72f48e786b6404f5d2c5b, 1906064d50d194a145486e5caf3db3e708b6f6ef +5

Exploitation evidence

Disclosed: evidence found.
CVE published 25 Jun 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 6 Nov 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ eff682f83c9c2030761e7536c5d97e1b20f71c15, < f0f3981c43b32cadfe373d636d9e9ca522bb3702	Fixed in f0f3981c43b32cadfe373d636d9e9ca522bb3702
LinuxLinux	Affected ≥ eff682f83c9c2030761e7536c5d97e1b20f71c15, < bfba882cfcd08f6540f72f48e786b6404f5d2c5b	Fixed in bfba882cfcd08f6540f72f48e786b6404f5d2c5b
LinuxLinux	Affected ≥ eff682f83c9c2030761e7536c5d97e1b20f71c15, < 1906064d50d194a145486e5caf3db3e708b6f6ef	Fixed in 1906064d50d194a145486e5caf3db3e708b6f6ef
LinuxLinux	Affected ≥ eff682f83c9c2030761e7536c5d97e1b20f71c15, < 964e50ef7b8f09815a7d05b8326af700f8d5bc96	Fixed in 964e50ef7b8f09815a7d05b8326af700f8d5bc96
LinuxLinux	Affected ≥ eff682f83c9c2030761e7536c5d97e1b20f71c15, < 98cfb7530ea91d8e5e928285cdce58e1131f6e83	Fixed in 98cfb7530ea91d8e5e928285cdce58e1131f6e83
LinuxLinux	Affected ≥ eff682f83c9c2030761e7536c5d97e1b20f71c15, < 91fb41218c413989d8b6c837748751454b452d68	Fixed in 91fb41218c413989d8b6c837748751454b452d68

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)

References

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