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CVE-2026-89448

iommu/vt-d: Force requesting ACS when tboot is enabled

CRITICAL

9.3

CVSS Score

Published: September 11, 2026 at 07:43 PM UTC

Updated: October 30, 2026 at 01:20 PM UTC

1 product affected across 1 vendorLinux Kernel

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Severity

CRITICAL9.3

Exploit prediction

EPSS 0.1%

SSVC

No known exploit

Description

In the Linux kernel, the following vulnerability has been resolved: iommu/vt-d: Force requesting ACS when tboot is enabled Currently the conditions of requesting ACS in detect_intel_iommu() don't include tboot, leading to a possible misconfiguration with ACS disabled (e.g. due to user opts) while iommu is later forced on by tboot_force_iommu(). Fix it by checking tboot in detect_intel_iommu().

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel · Linux

90%

2.6.335d990b627537e59a3a2f039ff588a4750e9c1a6a

Vendor states this is fixed in 45705a6bfdb283f7b3b509010fd617b72f942537 (fixed)

Vendor states this is fixed in 579eb867d3da63f3b5e32f235925e1daa7ec70d0 (fixed)

Vendor states this is fixed in 607432b2618b61df81134be0ef2562b8300c1216 (fixed)

Vendor states this is fixed in 87bc611c6c98a41c00feb7b06b0c297dd141a2ae (fixed)

Vendor states this is fixed in aaeb81241e802c86be69394f72d49fde3f861fbb (fixed)

Vendor states this is fixed in 2.6.33 (unaffected)

Vendor states this is fixed in 6.12.109 (unaffected)

Vendor states this is fixed in 6.18.50 (unaffected)

Vendor states this is fixed in 6.6.157 (unaffected)

Vendor states this is fixed in 7.2.4 (unaffected)

Vendor states this is fixed in 7.3 (unaffected)

Vendor states this is fixed in 7.3-rc1 (unaffected)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (6)

Source: cverecord

https://git.kernel.org/stable/c/aaeb81241e802c86be69394f72d49fde3f861fbb

Source: cverecord

https://git.kernel.org/stable/c/45705a6bfdb283f7b3b509010fd617b72f942537

Source: cverecord

https://git.kernel.org/stable/c/87bc611c6c98a41c00feb7b06b0c297dd141a2ae

Source: cverecord

https://git.kernel.org/stable/c/607432b2618b61df81134be0ef2562b8300c1216

Source: cverecord

https://git.kernel.org/stable/c/579eb867d3da63f3b5e32f235925e1daa7ec70d0

Source: cverecord

https://git.kernel.org/stable/c/3fd2b60ea9bd18348f5e971678f31041ef211047

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

9.3CRITICALLinux

Vector?

Quick Info

StatusRECEIVED

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