CVE-2026-90243 Linux Kernel - Broken Authentication

Linux kernel contains a broken authentication caused by improper clearing of the Present bit before tearing down copied context entries in iommu/vt-d, letting hardware fetch torn entries causing unpredictable behavior or faults, exploit requires specific hardware conditions.

CVSS base score 8.1 /10
High
CISA KEV
Not listed
Public exploit
None known
EPSS
0.16% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Broken Authentication
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
Published
17 September 2026
Updated
15 October 2026

Vendor fix

Update to the latest Linux kernel version containing the fix for iommu/vt-d context entry handling.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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