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CVE-2026-89811

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

Description (CNA)

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 commit f5c4f88e0f9c45a8fb9dfac0c1df726c95e41b77)

Affected (CNA)

Vendor / productVersions
Linux / Linuxaffected cc009e613de6560eb499f8bc92c80a737752cb30 before 5bbd7f283312d0209a0fedcc9d2d33b5afa5a7b1; affected cc009e613de6560eb499f8bc92c80a737752cb30 before bbf5ad5268f36d7ebb7e99ae78fc73cffe98d372; affected cc009e613de6560eb499f8bc92c80a737752cb30 before e230c546ed93741833ab5babb0b202f9c2052b45; affected cc009e613de6560eb499f8bc92c80a737752cb30 before 6aae545c87087e4dc96e205452243813bfa73ba2; affected cc009e613de6560eb499f8bc92c80a737752cb30 before 94e25cb6ab7f4f025bcdcd8ea79fda30f12843a4
Linux / Linuxaffected 5.19; unaffected 0 before 5.19; unaffected 6.6.160 through 6.6.*; unaffected 6.12.114 through 6.12.*; unaffected 6.18.51 through 6.18.*; unaffected 7.2.5 through 7.2.*; unaffected 7.3 through *

CWE

No CWE identifiers supplied.

References