SB20260918424 - Race condition in Linux kernel iommu intel driver

Description

This security bulletin contains information about 1 vulnerability.

1) Race condition (CVE-ID: CVE-2026-90243)

CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

CVSSv4: 2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]

The vulnerability allows a local user to cause spurious faults or unpredictable behavior.

The vulnerability exists due to a race condition in copied_context_tear_down() in the Intel VT-d IOMMU driver when tearing down copied context entries. A local user can trigger teardown of a copied context entry while its Present bit remains set to cause spurious faults or unpredictable behavior.

On IOMMUs without coherent access to the context table, a zeroed entry may not be visible to hardware when invalidation is submitted.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/3c88cfedc7768b1ae2dc7ddc71547ae9a1aaff7d
• https://git.kernel.org/stable/c/6b822d18c33af9d1e16a8e5e6aa6e656987b09de
• https://git.kernel.org/stable/c/97750a8dce79c1a9b2b2d2a020b61b800141996c
• https://git.kernel.org/stable/c/f532c57985b1a7d6b7e37e05506b46d413e5cca4