SB2026050970 - Race condition in Linux kernel amd amdgpu driver

Description

This security bulletin contains information about 1 vulnerability.

1) Race condition (CVE-ID: CVE-2026-43318)

CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to improper synchronization in amdgpu_dma_buf_move_notify when handling dma-buf move notifications for shared buffer objects. A local user can trigger a buffer move while another GPU job is still running to cause a denial of service.

The issue can occur in multi-GPU environments using shared buffer objects where a page table update happens before the originating blit job has completed, leading to a likely page fault.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/3307459eb3583115264421e859858d1f90f3694a
• https://git.kernel.org/stable/c/82a7ea35a1526bef8ae170c33ff80e5db7728961
• https://git.kernel.org/stable/c/89a9389ad70d3c69538e59d87df67d407aef4c26
• https://git.kernel.org/stable/c/b18fc0ab837381c1a6ef28386602cd888f2d9edf