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CVE-2026-90289: drm/amd/display: Resize MST HDCP per-connector arrays to 32

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-17 · updated 2026-10-30

Description

In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Resize MST HDCP per-connector arrays to 32 AMDGPU_DM_MAX_DISPLAY_INDEX is 31. It suggest a maximum number of 32 connectors. But the way it's used is like MAX_DISPLAY_COUNT. Hence we're off by one with DRM core, which supports a max of 32 connectors. Rename AMDGPU_DM_MAX_DISPLAY_INDEX to AMDGPU_DM_MAX_DISPLAY_COUNT to match its actual use, and increase the size to 32 to match the originally intended size.

Affected products

• Linux: from 6.1.47 before 6.1.191; from 5.15.128 before 5.16 — fixed in 6.1.191, 5.16

How to fix

Upgrade to a fixed version: Linux 6.1.191, 5.16. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/0fa116a17b69a28712cdf209318e345b676d7f6c
• https://git.kernel.org/stable/c/1c22294c7d9b3b1c26a18ca4eca8c863a5a0d907
• https://git.kernel.org/stable/c/261e0fe4e2c99f687114b64b10b98db964b475f4
• https://git.kernel.org/stable/c/562d24ac214ba9530d88841088eb6adce5c537b5
• https://git.kernel.org/stable/c/ac490fea9fe74f9d9975c5d8250c8719750589cd
• https://git.kernel.org/stable/c/decea8279bec5a35413b2cb8e36951cca308fac0

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