SB20260528137 - Race condition in Linux kernel iommu intel driver

Description

This security bulletin contains information about 1 vulnerability.

1) Race condition (CVE-ID: CVE-2026-45944)

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

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 attacker to cause a denial of service.

The vulnerability exists due to a race condition in the Intel VT-d IOMMU context entry teardown logic when tearing down context entries. A local attacker can trigger use of a torn context entry to cause a denial of service.

The issue arises because the hardware may observe a partially updated 128-bit context entry while the Present bit remains set, resulting in unpredictable behavior or spurious faults.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/a922dbafb4a674d958d702038232d09a30daf770
• https://git.kernel.org/stable/c/c1e4f1dccbe9d7656d1c6872ebeadb5992d0aaa2
• https://git.kernel.org/stable/c/d2138abc8f0a7fce4101b7229b43b06811ed083d