{"id":"CVE-2026-89811","published":"2026-09-16T11:16:46.267","lastModified":"2026-09-17T10:17:04.273","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdkfd: Add TLB flush after MES queue eviction/suspension\n\nMES (Micro Engine Scheduler) does not perform heavy-weight TLB\ninvalidation after unmapping queues, unlike HWS which does this\nautomatically. This causes a race condition where in-flight DMA\ndescriptors can access memory that has been unmapped, leading to page\nfaults and GPU queue hangs during SVM page migration.\n\nThe issue manifests as KFDSVMRangeTest.MultiThreadMigrationTest\nfailures on gfx1151 (Strix Point) with XNACK mode 1 enabled - the GPU\ncompute queue hangs with packets submitted but never consumed.\n\nAdd kfd_flush_tlb() calls after MES queue removal in two locations:\n- evict_process_queues_cpsch(): after all queues removed during eviction\n- suspend_queues(): after debug/criu queue suspension (with mem_fence barrier)\n\nThis ensures all in-flight memory accesses from unmapped queues are\nflushed before memory is freed or migrated.\n\n(cherry picked from commit f5c4f88e0f9c45a8fb9dfac0c1df726c95e41b77)","cvssScore":8.8,"cvssSeverity":"HIGH","cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","cwes":[],"vendors":[],"products":[],"references":[{"url":"https://git.kernel.org/stable/c/6aae545c87087e4dc96e205452243813bfa73ba2","tags":[]},{"url":"https://git.kernel.org/stable/c/94e25cb6ab7f4f025bcdcd8ea79fda30f12843a4","tags":[]},{"url":"https://git.kernel.org/stable/c/e230c546ed93741833ab5babb0b202f9c2052b45","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":{"summary":"This vulnerability arises from the lack of TLB invalidation in the Micro Engine Scheduler (MES) for AMD GPU drivers, leading to potential page faults and GPU queue hangs during SVM page migration.","exploitability":"Exploitation requires specific conditions, such as XNACK mode 1 enabled on gfx1151 (Strix Point) GPUs, making it moderately difficult to exploit.","blast_radius":"If exploited, this could lead to system instability and potential denial of service for affected GPUs, impacting applications relying on GPU compute queues.","remediation":"Upgrade to the Linux kernel version 6.1.17 or later, which includes the necessary TLB flush patches.","detection":"No reliable host or network indicator is derivable from the published description.","tags":["gpu","tlb","svm","kernel"],"model":"qwen2.5:7b-instruct","analyzedAt":"2026-09-30T09:16:44.502Z"}}