SB20260815158 - NULL pointer dereference in Linux kernel virtio driver

Description

This security bulletin contains information about 1 vulnerability.

1) NULL pointer dereference (CVE-ID: CVE-2026-74311)

CWE-ID: CWE-476 - NULL Pointer Dereference

CVSSv4: 6.8 [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]

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

The vulnerability exists due to a NULL pointer dereference in virtio rtc virtqueue restore handling when reinitializing virtqueues during device restore. A local user can trigger device restore and cause the guest kernel to crash.

The issue can occur if virtqueue reinitialization fails on virtio-pci, including cases where an earlier queue setup attempt fails before a later one would otherwise succeed.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/548d2208455f14e6121404c6e30e997bfe0cd264
• https://git.kernel.org/stable/c/79366023aa891ca31376021a7bccff6384ca1ff1
• https://git.kernel.org/stable/c/aebebd1e9d70b650fc9e877082e0134edcf511da