CVE-2026-89814: drm/amdgpu: clamp the isolation index for rings outside a partition

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-09-16 · updated 2026-10-19

Description

In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu: clamp the isolation index for rings outside a partition adev->isolation[] has one slot per partition, but a ring that is not assigned to one keeps AMDGPU_XCP_NO_PARTITION, which is ~0, so indexing the array with it is out of bounds. SDMA submissions hit this on both the isolation enforcement and the VM flush path and trip UBSAN. Fall back to the first slot the way the cleaner shader path already does, and stop taking the address before the ring type check that makes it relevant.

Affected products

Linux kernel: from 6.14.9 before 6.15; 6.15 — fixed in 6.15, 7.3

How to fix

Upgrade to a fixed version: Linux kernel 6.15, 7.3. Check the vendor advisory for mitigations.

References

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