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CVE-2026-89448

CRITICALCVSS 9.3/10EPSS 0.14%

Last modified

CVE-2026-89448 is a critical-severity vulnerability rated 9.3/10 on the CVSS scale. 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().. EPSS estimates a 0.14% chance of exploitation in the next 30 days.

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().

Metrics

CVSS 3.1
9.3/10

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

EPSS Probability
0.14%

4.0th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 5d990b627537e59a3a2f039ff588a4750e9c1a6a, < 579eb867d3da63f3b5e32f235925e1daa7ec70d0; >= 5d990b627537e59a3a2f039ff588a4750e9c1a6a, < aaeb81241e802c86be69394f72d49fde3f861fbb; >= 5d990b627537e59a3a2f039ff588a4750e9c1a6a, < 45705a6bfdb283f7b3b509010fd617b72f942537; >= 5d990b627537e59a3a2f039ff588a4750e9c1a6a, < 87bc611c6c98a41c00feb7b06b0c297dd141a2ae; >= 5d990b627537e59a3a2f039ff588a4750e9c1a6a, < 607432b2618b61df81134be0ef2562b8300c1216
LinuxLinux2.6.33

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-89448?
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().
How severe is CVE-2026-89448?
CVE-2026-89448 has a CVSS score of 9.3/10 (CRITICAL severity). The EPSS model estimates a 0.14% probability of exploitation in the next 30 days.
How do I fix CVE-2026-89448?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST