Race condition in Linux kernel - CVE-2026-97993

Vulnerability details

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().

Affected software

How to mitigate CVE-2026-97993

External 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

Related Security Bulletins

• Race condition in Linux kernel vhost driver