CVE-2024-42121: drm/amd/display: Check index msg_id before read or write

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-07-30 · updated 2026-06-17
Weakness: CWE-129

Description

In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Check index msg_id before read or write [WHAT] msg_id is used as an array index and it cannot be a negative value, and therefore cannot be equal to MOD_HDCP_MESSAGE_ID_INVALID (-1). [HOW] Check whether msg_id is valid before reading and setting. This fixes 4 OVERRUN issues reported by Coverity.

Affected products

Linux kernel: from 4.15 before 5.10.222; from 5.11 before 5.15.163; from 5.16 before 6.1.98; from 6.2 before 6.6.39; from 6.7 before 6.9.9 — fixed in 5.10.222, 5.15.163, 6.1.98, 6.6.39, 6.9.9

How to fix

Upgrade to a fixed version: Linux kernel 5.10.222, 5.15.163, 6.1.98, 6.6.39. Check the vendor advisory for mitigations.

References

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