SB20260425150 - Race condition in Linux kernel nvme target driver

Description

This security bulletin contains information about 1 vulnerability.

1) Race condition (CVE-ID: CVE-2026-31557)

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 async event work handling on the nvmet workqueue when freeing an NVMe target controller during queue disconnect processing. A local user can trigger queue disconnect and controller cleanup to cause a denial of service.

The issue arises from recursive locking when async event work is flushed from the same worker processing nvmet-wq.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/25ceffc1dabec3b93f458b437aae26f4da293f87
• https://git.kernel.org/stable/c/2922e3507f6d5caa7f1d07f145e186fc6f317a4e
• https://git.kernel.org/stable/c/49c7c50ee6325a084216e94395e067ecde8088fa
• https://git.kernel.org/stable/c/ca111c9d8d6c9d5735878d933a1716c4be86c2d1