Race condition in Linux kernel - CVE-2026-90243
Published: September 18, 2026
Vulnerability identifier: #VU151237
CSH Severity: Low
CVSS v4: 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]
CVE-ID: CVE-2026-90243
CWE-ID: CWE-362
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
Linux kernel
How to mitigate CVE-2026-90243
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3