SB2026062529 - Use-after-free in Linux kernel vdpa driver_override handling in the vDPA bus match callback

Description

This security bulletin contains information about 1 vulnerability.

1) Use-after-free (CVE-ID: CVE-2026-53118)

CWE-ID: CWE-416 - Use After Free

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 a use-after-free in the vdpa driver_override handling in the vDPA bus match callback when probing a driver through __driver_attach(). A local user can trigger driver matching while the driver_override field is accessed without the device lock to cause a denial of service.

The issue occurs because the bus match callback is invoked without the device lock held during this code path.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/654ef9c33e138ede6734ac286282df9faf83cd11
• https://git.kernel.org/stable/c/85bb534ff12aab6916058897b39c748940a7a4c6
• https://git.kernel.org/stable/c/fb5cb4913ce333cc4647722e8c2b8378e12f2464