drm/amdkfd: Add TLB flush after MES queue eviction/suspension
CVE-2026-89811 · published 16 Sept 2026
How serious is it
- Severity: high, CVSS score 8.8 out of 10.
- No exploit prediction (EPSS) score yet.
- Not on the CISA list of exploited vulnerabilities.
- No public exploit in Exploit-DB.
Is your app affected by CVE-2026-89811?
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Who is affected
- Linux Linux: cc009e613de6560eb499f8bc92c80a737752cb30 to < 5bbd7f283312d0209a0fedcc9d2d33b5afa5a7b1, cc009e613de6560eb499f8bc92c80a737752cb30 to < bbf5ad5268f36d7ebb7e99ae78fc73cffe98d372, cc009e613de6560eb499f8bc92c80a737752cb30 to < e230c546ed93741833ab5babb0b202f9c2052b45, cc009e613de6560eb499f8bc92c80a737752cb30 to < 6aae545c87087e4dc96e205452243813bfa73ba2
- Linux Linux: 5.19
How to check
- Find out whether you run the affected product and which version, then compare it with the versions above.
How to fix
Copies a prompt for Claude Code, Cursor or Codex that asks it to check whether you run this product.
- Apply the vendor's update or mitigation from the references below. If there is none yet, limit exposure of the affected service until there is.
- If a vulnerable version was live, check your logs and rotate the secrets that server could read.
The advisory
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)
Check your whole app
Dependencies are only half of it. Free and read-only: before you push, run npx shippable-dev scan localhost:3000 in your project folder, no account needed. For your live app, you prove it's yours with a one-line tag first.
References
- git.kernel.org/stable/c/5bbd7f283312d0209a0fedcc9d2d33b5afa5a7b1
- git.kernel.org/stable/c/bbf5ad5268f36d7ebb7e99ae78fc73cffe98d372
- git.kernel.org/stable/c/e230c546ed93741833ab5babb0b202f9c2052b45
- git.kernel.org/stable/c/6aae545c87087e4dc96e205452243813bfa73ba2
- git.kernel.org/stable/c/94e25cb6ab7f4f025bcdcd8ea79fda30f12843a4
Merged from CVE List. Last updated 26 Oct 2026. All vulnerabilities · RSS · JSON