CVE-2026-89811

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

drm/amdkfd: Add TLB flush after MES queue eviction/suspension

MES (Micro Engine Scheduler) does not perform heavy-weight TLB

invalidation after unmapping queues, unlike HWS which does this

automatically. This causes a race condition where in-flight DMA

descriptors can access memory that has been unmapped, leading to page

faults and GPU queue hangs during SVM page migration.

The issue manifests as KFDSVMRangeTest.MultiThreadMigrationTest

failures on gfx1151 (Strix Point) with XNACK mode 1 enabled - the GPU

compute queue hangs with packets submitted but never consumed.

Add kfd_flush_tlb() calls after MES queue removal in two locations:

- evict_process_queues_cpsch(): after all queues removed during eviction

- suspend_queues(): after debug/criu queue suspension (with mem_fence barrier)

This ensures all in-flight memory accesses from unmapped queues are

flushed before memory is freed or migrated.

(cherry picked from

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References