CVE-2026-89448 Linux Kernel - Misconfiguration

Linux kernel contains a misconfiguration vulnerability in iommu/vt-d where ACS is not requested when tboot is enabled, causing potential security bypass due to disabled ACS, exploit requires tboot enabled.

CVSS base score 9.3 /10
Critical
CISA KEV
Not listed
Public exploit
None known
EPSS
0.14% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Misconfiguration
Impact
Privilege Escalation
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Published
11 September 2026
Updated
15 October 2026

Vendor fix

Update to the latest Linux kernel version with the ACS request fix in detect_intel_iommu.

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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