SB20260507179 - Improper Check for Unusual or Exceptional Conditions in Linux kernel iommu intel driver

Description

This security bulletin contains information about 1 vulnerability.

1) Improper Check for Unusual or Exceptional Conditions (CVE-ID: CVE-2026-43161)

CWE-ID: CWE-754 - Improper Check for Unusual or Exceptional Conditions

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 improper handling of inaccessible devices in Intel IOMMU dev-iotlb flush logic when releasing or detaching a PCIe endpoint after its link drops. A local user can trigger device release or detachment for an ATS-enabled passed-through PCIe endpoint to cause a denial of service.

The issue occurs when scalable mode is disabled or unsupported, and it can also be triggered after a link fault leaves the endpoint inaccessible without a link-down event.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/42662d19839f34735b718129ea200e3734b07e50
• https://git.kernel.org/stable/c/48b3f08e68b29a79527869cdde7298ca2a9b9646
• https://git.kernel.org/stable/c/bc0490ad9edf5c6f98e39fbbee2877b85261a5ae
• https://git.kernel.org/stable/c/e70d5feb10c5ba2bbf7ca400b8f39a2f82d653e8