What’s Vulnerable › Vulnerabilities

CVE-2026-89448: iommu/vt-d: Force requesting ACS when tboot is enabled

• Severity: critical (CVSS 9.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-11 · updated 2026-10-30

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 products

• Linux: 2.6.33 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux 7.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/3fd2b60ea9bd18348f5e971678f31041ef211047
• https://git.kernel.org/stable/c/45705a6bfdb283f7b3b509010fd617b72f942537
• https://git.kernel.org/stable/c/579eb867d3da63f3b5e32f235925e1daa7ec70d0
• https://git.kernel.org/stable/c/607432b2618b61df81134be0ef2562b8300c1216
• https://git.kernel.org/stable/c/87bc611c6c98a41c00feb7b06b0c297dd141a2ae
• https://git.kernel.org/stable/c/aaeb81241e802c86be69394f72d49fde3f861fbb

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