UBUNTU-CVE-2026-89812: Medium severity ubuntu/linux-hwe-edge vulnerability

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 (noscheduler = true), so it is skipped by the force-completion loop in amdgpudevicepreasicreset(). It uses a polling fence whose hw value lives in wb (GTT) memory and survives a MODE1 reset, while fencedrv.syncseq keeps advancing for every packet. When the reset is triggered because MES itself stopped responding, the timed-out packets advance syncseq 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 gfx0.0.0 test failed (-110) amdgpu: resume of IP block <gfxv110> 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 syncseq. v2: cover all XCCs (one scheduler ring each), not just mes.ring[0].