CVE-2025-68174

Technical Description

In the Linux kernel, the following vulnerability has been resolved:

amd/amdkfd: enhance kfd process check in switch partition

current switch partition only check if kfd_processes_table is empty.

kfd_prcesses_table entry is deleted in kfd_process_notifier_release, but

kfd_process tear down is in kfd_process_wq_release.

consider two processes:

Process A (workqueue) -> kfd_process_wq_release -> Access kfd_node member

Process B switch partition -> amdgpu_xcp_pre_partition_switch -> amdgpu_amdkfd_device_fini_sw

-> kfd_node tear down.

Process A and B may trigger a race as shown in dmesg log.

This patch is to resolve the race by adding an atomic kfd_process counter

kfd_processes_count, it increment as create kfd process, decrement as

finish kfd_process_wq_release.

v2: Put kfd_processes_count per kfd_dev, move decrement to kfd_process_destroy_pdds

and bug fix. (Philip Yang)

[3966658.307702] divide error: 0000 [#1] SMP NOPTI

[3966658.350818] i10nm_edac

[3966658.356318] CPU: 124 PID: 38

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References