# CVE-2026-89812: drm/amdgpu: force complete the MES ring fences on reset

CVE-2026-89812 is fixed in linux on 1 platform, first by DEBIAN-CVE-2026-89812, released September 23, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-89812
- Priority: Routine
- CVSS: 5.5 (Moderate)
- EPSS: 0.0021
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 16, 2026
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-89812

## Description

In the Linux kernel, the following vulnerability has been resolved:  drm/amdgpu: force complete the MES ring fences on reset  The MES scheduler ring has no drm scheduler (no_scheduler = true), so it is skipped by the force-completion loop in amdgpu_device_pre_asic_reset(). It uses a polling fence whose hw value lives in wb (GTT) memory and survives a MODE1 reset, while fence_drv.sync_seq keeps advancing for every packet.  When the reset is triggered because MES itself stopped responding, the timed-out packets advance sync_seq past the last hw fence value MES wrote. After resume the first MES submission polls forever on a seq that is never written back, failing the resume and wedging the box on a second reset:    amdgpu: MES ring buffer is full.   amdgpu: *ERROR* ring gfx_0.0.0 test failed (-110)   amdgpu: resume of IP block <gfx_v11_0> failed -110   amdgpu: GPU reset end with ret = -110  Force complete the MES scheduler ring fences together with the scheduler rings so their hw fence is realigned to sync_seq.  v2: cover all XCCs (one scheduler ring each), not just mes.ring[0].

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 13.5 (trixie) | 6.12.115-2 | [DEBIAN-CVE-2026-89812](https://patchblox.com/security/data/fix/linux/debian-cve-2026-89812.md) | Sep 23, 2026 |
| Linux | linux Debian 14 | 7.2.6-1 | [DEBIAN-CVE-2026-89812](https://patchblox.com/security/data/fix/linux/debian-cve-2026-89812.md) | Sep 23, 2026 |

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Data as of 2026-11-09T13:31:49Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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