CVE-2026-89814

drm/amdgpu: clamp the isolation index for rings outside a partition

State: Published
Severity: 7.8 High
Published: Sep 16, 2026
Updated: Oct 19, 2026
Reserved: Sep 11, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	7.8 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	bd22e44ad415ac22e3a4f9a983d2a085f6cb4427 to before 964de255497ffd7cb8a86e405b8ac6d927e7e177Affected bd22e44ad415ac22e3a4f9a983d2a085f6cb4427 to before 0bfb938182d1313e5cac32ae38dbaaa4eabe4af4Affected bd22e44ad415ac22e3a4f9a983d2a085f6cb4427 to before b30900566642ceb2c9e12b56c2afec28d0fd91a0Affected 4277dc1942a8979abe1ef2b55069f42497f885c0Affected 6.14.9 to before 6.15Affected
LinuxLinux	6.15Affected before 6.15Not affected 6.18.51 through 6.18.Not affected 7.2.5 through 7.2.Not affected 7.3 and laterNot affected

References

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