SB2026052843 - NULL pointer dereference in Linux kernel vfio cdx driver

Description

This security bulletin contains information about 1 vulnerability.

1) NULL pointer dereference (CVE-ID: CVE-2026-46034)

CWE-ID: CWE-476 - NULL Pointer Dereference

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 null pointer dereference in vfio_cdx_set_msi_trigger() when handling VFIO_DEVICE_SET_IRQS requests with VFIO_IRQ_SET_DATA_BOOL or VFIO_IRQ_SET_DATA_NONE before interrupts are configured through the EVENTFD path. A local user can call VFIO_DEVICE_SET_IRQS with those flags before setting up interrupts to cause a denial of service.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/338a736aaf15e8ba3635ce20b29af5b8fc15e66a
• https://git.kernel.org/stable/c/51bf7638f33aece41cb3f4cbeb942cc52950e329
• https://git.kernel.org/stable/c/5d6c349c9823eb819fed8b537b088cf38126018c
• https://git.kernel.org/stable/c/5ea5880764cbb164afb17a62e76ca75dc371409d