---
id: CVE-2026-89811
title: |-
  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, unlik…
summary: |-
  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, unlik…
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H'
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    e230c546ed93741833ab5babb0b202f9c2052b45
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    6aae545c87087e4dc96e205452243813bfa73ba2
  - >-
    Linux >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <
    94e25cb6ab7f4f025bcdcd8ea79fda30f12843a4
  - Linux < 6.18.51
  - Linux < 7.2.5
  - Linux (all versions)
published: '2026-09-16'
updated: '2026-09-17'
sourceUpdated: '2026-09-17T10:17:04.273'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89811'
references:
  - url: 'https://git.kernel.org/stable/c/6aae545c87087e4dc96e205452243813bfa73ba2'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/94e25cb6ab7f4f025bcdcd8ea79fda30f12843a4'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/e230c546ed93741833ab5babb0b202f9c2052b45'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-16T10:53:54.005Z'
epss: 0.00173
epssPercentile: 0.0595
---

## Overview

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)

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.