# CVE-2026-89448

## Summary

- **CVE ID:** CVE-2026-89448
- **Severity:** CRITICAL
- **CVSS Score:** 9.3 (CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H)
- **CWE:** N/A
- **Published:** Sep 11, 2026
- **Last Modified:** Sep 14, 2026

## 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 — Linux (5d990b627537e59a3a2f039ff588a4750e9c1a6a)
- Linux — Linux (2.6.33)
- Linux — Linux (0)
- Linux — Linux (6.12.109)
- Linux — Linux (6.18.50)
- Linux — Linux (7.2.4)
- Linux — Linux (7.3-rc1)
- Linux — Linux (6.6.157)

## References

- [CNA](https://git.kernel.org/stable/c/aaeb81241e802c86be69394f72d49fde3f861fbb)
- [CNA](https://git.kernel.org/stable/c/45705a6bfdb283f7b3b509010fd617b72f942537)
- [CNA](https://git.kernel.org/stable/c/87bc611c6c98a41c00feb7b06b0c297dd141a2ae)
- [CNA](https://git.kernel.org/stable/c/607432b2618b61df81134be0ef2562b8300c1216)
- [CNA](https://git.kernel.org/stable/c/579eb867d3da63f3b5e32f235925e1daa7ec70d0)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.14%
- **EPSS Percentile:** 4.0

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._