SB2026062918 - NULL pointer dereference in Linux kernel microsoft mana driver

Description

This security bulletin contains information about 1 vulnerability.

1) NULL pointer dereference (CVE-ID: CVE-2026-53324)

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 the mana debugfs directory creation logic when creating per-device debugfs directories for virtual functions. A local user can trigger device initialization in an environment where pdev->slot is NULL to cause a denial of service.

The issue can occur in environments such as generic VFIO passthrough or nested KVM.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/34dbd7b819544c99c9d96b400fe4db613f40ac4b
• https://git.kernel.org/stable/c/9211eb97e8f8c28bf9313ab97862d143dbbbef97
• https://git.kernel.org/stable/c/c116f07ab9d22bb6f355f3cf9e44c1e6a47fe559