Bug 2532174 (CVE-2026-89448) - CVE-2026-89448 kernel: iommu/vt-d: Force requesting ACS when tboot is enabled
Summary: CVE-2026-89448 kernel: iommu/vt-d: Force requesting ACS when tboot is enabled
Keywords:
Status: NEW
Alias: CVE-2026-89448
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-09-11 21:06 UTC by OSIDB Bzimport
Modified: 2026-09-17 18:36 UTC (History)
17 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-09-11 21:06:47 UTC 
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().
Comment 1 Mauro Matteo Cascella 2026-09-17 18:29:21 UTC 
Upstream advisory:
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89448.mbox
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