CVE-2023-53780: drm/amd/display: fix FCLK pstate change underflow

Severity: unknown
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: 2025-12-09 · updated 2026-06-17

Description

In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: fix FCLK pstate change underflow [Why] Currently we set FCLK p-state change watermark calculated based on dummy p-state latency when UCLK p-state is not supported [How] Calculate FCLK p-state change watermark based on on FCLK pstate change latency in case UCLK p-state is not supported

Affected products

Linux kernel: 4.15 — fixed in 6.3

How to fix

Upgrade to a fixed version: Linux kernel 6.3. Check the vendor advisory for mitigations.

References

https://git.kernel.org/stable/c/4bdfa48d74649898468a0bf5c8b8a48dded77b4a
https://git.kernel.org/stable/c/6853d56dba56d1c24db403ff3885c71e18d572c4
https://git.kernel.org/stable/c/972243f973eb0821084e5833d5f7f4ed025f42da

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