In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Atomize IRQ register read/modify/write ops [Why] The… (CVE-2026-98654)

The vulnerability in the Linux kernel AMD GPU driver arises from non-atomic read/modify/write operations on the GLOBAL_SYNC_STATUS IRQ control register. The driver sets and clears bits to enable and acknowledge IRQs, but these operations are not atomic, leading to a race condition where an IRQ acknowledgment can inadvertently clear the IRQ enable bit. This race is exacerbated on high refresh rate panels, potentially causing timeouts. The fix involves introducing a driver-wide spinlock to serialize these operations, ensuring atomicity and preventing the race condition. The patch also migrates IRQ set/ack functions to use this locking mechanism.

The race condition can cause IRQ handling issues, specifically timeouts in vblank handling on high refresh rate panels. This could lead to display instability or degraded performance in the AMD GPU driver. There is no indication of privilege escalation or remote code execution from the provided data.

A fix has been implemented that introduces a driver-wide spinlock to atomize IRQ register read/modify/write operations, preventing the race condition. Users should update to the Linux kernel version containing this fix once available. Patch status is not explicitly confirmed in the provided data; check the vendor advisory for current remediation guidance.