SB2026062983 - Use-after-free in Linux kernel iommu intel driver

Description

This security bulletin contains information about 1 vulnerability.

1) Use-after-free (CVE-ID: CVE-2026-53281)

CWE-ID: CWE-416 - Use After Free

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a local user to cause a denial of service or execute arbitrary code.

The vulnerability exists due to a NULL pointer dereference and use-after-free in the Intel VT-d IOMMU PASID teardown logic when detaching a domain that was not attached to the IOMMU or when a PASID entry is not found. A local user can trigger teardown operations on an invalid or missing PASID association to cause a denial of service or execute arbitrary code.

The issue can also corrupt reference counts, which may prematurely drop a shared domain reference to zero for remaining active devices.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/79ea2feb917b05366b49d85573c9c5331f043b2c
• https://git.kernel.org/stable/c/9022cb9ac0c2a72a57fa8ebf92ac74f953ca0153
• https://git.kernel.org/stable/c/cdfe3c9f2c9e28a8651ee463c88ad191ced2f840