CVE-2026-89448critical

CVE-2026-89448: critical vulnerability in Linux

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

Published · Updated

28Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 9.3epss 0.1%
exploitation probability
0.1%top 97% of all CVEs
observed exploitation
nono source reports it
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().
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Affected products
Linux · Linux
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References
https://git.kernel.org/stable/c/45705a6bfdb283f7b3b509010fd617b72f942537https://git.kernel.org/stable/c/579eb867d3da63f3b5e32f235925e1daa7ec70d0https://git.kernel.org/stable/c/607432b2618b61df81134be0ef2562b8300c1216https://git.kernel.org/stable/c/87bc611c6c98a41c00feb7b06b0c297dd141a2aehttps://git.kernel.org/stable/c/aaeb81241e802c86be69394f72d49fde3f861fbb