SB20260928206 - Race condition in Linux kernel vhost driver

Description

This security bulletin contains information about 1 vulnerability.

1) Race condition (CVE-ID: CVE-2026-97993)

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

CVSSv4: 2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]

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

The vulnerability exists due to a race condition in vhost_vdpa_set_config_call() when installing a configuration eventfd context. A local user can supply an invalid eventfd descriptor while setting the configuration callback to cause a denial of service.

A configuration interrupt delivered during the error-handling window can pass an error pointer to eventfd_signal().

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/388c678639a0cebfd936b3e56c64ac6a371efec2
• https://git.kernel.org/stable/c/65faf9eaa00e408e1406fbcf675c8c8d0e27ff2a
• https://git.kernel.org/stable/c/6b20b40f020bde236f6b8a08ff88d8653261ec2b
• https://git.kernel.org/stable/c/e74a9fa50749b9940b4fb13199652325e08d3c4a