CVE-2026-89448 in the critical feed json
iommu/vt-d: Force requesting ACS when tboot is enabled
published 2026-09-11 58 d ago modified 2026-10-30 9 d ago also EUVD-2026-76354
- cvss
- 9.3
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.1%
- EPSS 0.1% chance of exploitation in 30 days, percentile 3%
- public exploits
- 0
- none known
Summary
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().
Patch / fix
- Linux Linux 6.1.191, 6.6.157, 6.12.109, 6.18.50, 7.2.4, 7.3
- linux Debian 13 6.12.111-1
- linux Debian 14 7.2.6-1
- linux-6.12 Debian 12 6.12.111-1~deb12u1
debian advisories DEBIAN-CVE-2026-89448
- linux Ubuntu 26.04 LTS 7.0.0-42.42
- linux-aws Ubuntu 26.04 LTS 7.0.0-1016.17
- linux-gcp Ubuntu 26.04 LTS 7.0.0-1016.18
- linux-ibm Ubuntu 26.04 LTS 7.0.0-1017.17
- linux-riscv Ubuntu 26.04 LTS 7.0.0-42.42.1
- linux-oracle Ubuntu 26.04 LTS 7.0.0-1015.16
- linux-hwe-7.0 Ubuntu 24.04 LTS 7.0.0-42.42~24.04.1
- linux-oem-7.0 Ubuntu 26.04 LTS 7.0.0-1017.17
ubuntu advisories UBUNTU-CVE-2026-89448
Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0
- kernel-64kb SLE Module for Basesystem 15 SP7 6.4.0-150700.53.84.1
- kernel-syms SLE Module for Development Tools 15 SP7 6.4.0-150700.53.84.1
- kernel-azure SLE Module for Public Cloud 15 SP7 6.4.0-150700.53.84.1
- kernel-source SLE Module for Development Tools 15 SP7, SLE Module for Basesystem 15 SP7 6.4.0-150700.53.84.1
- kernel-default SLE Workstation Extension 15 SP7, SLE Module for Legacy 15 SP7, SLE Module for Basesystem 15 SP7 +2 more 6.4.0-150700.53.84.1
- kernel-zfcpdump SLE Module for Basesystem 15 SP7 6.4.0-150700.53.84.1
- kernel-obs-build SLE Module for Development Tools 15 SP7 6.4.0-150700.53.84.1
- kernel-default-base SLE Module for Basesystem 15 SP7 6.4.0-150700.53.84.1.150700.17.47.1
suse advisories SUSE-SU-2026:4706-1SUSE-SU-2026:4687-1SUSE-SU-2026:4640-1SUSE-SU-2026:24316-1SUSE-SU-2026:24315-1SUSE-SU-2026:24181-1
- kernel-rt openSUSE Leap 16.0 6.12.0-160000.39.1
- dtb-aarch64 openSUSE Leap 16.0 6.12.0-160000.39.1
- kernel-64kb openSUSE Leap 16.0 6.12.0-160000.39.1
- kernel-syms openSUSE Leap 16.0 6.12.0-160000.39.1
- kernel-azure openSUSE Leap 16.0 6.12.0-160000.39.1
- kernel-obs-qa openSUSE Leap 16.0 6.12.0-160000.39.1
- kernel-source openSUSE Leap 16.0 6.12.0-160000.39.1
- kernel-default openSUSE Leap 16.0 6.12.0-160000.39.1
opensuse advisories openSUSE-SU-2026:22091-1openSUSE-SU-2026:11880-1
- kernel Azure Linux 3.0 6.6.157.1-1
azure linux advisories AZL-100874
Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT
- git.kernel.org/stable/c/3fd2b60ea9bd18348f5e971678f31041ef211047 commit
- git.kernel.org/stable/c/579eb867d3da63f3b5e32f235925e1daa7ec70d0 commit
- git.kernel.org/stable/c/aaeb81241e802c86be69394f72d49fde3f861fbb commit
- git.kernel.org/stable/c/45705a6bfdb283f7b3b509010fd617b72f942537 commit
- git.kernel.org/stable/c/87bc611c6c98a41c00feb7b06b0c297dd141a2ae commit
- git.kernel.org/stable/c/607432b2618b61df81134be0ef2562b8300c1216 commit
Vendor advisories
What the vendors themselves say about their products: affected, fixed or not affected, and what to do.
red hat product security vex CVE-2026-89448 updated cvss 5.8
kernel: iommu/vt-d: Force requesting ACS when tboot is enabled
-
Red Hat Enterprise Linux 8 perf, kernel, bpftool, kernel-rt, kernel-core, kernel-tools, +29 more Red Hat Enterprise Linux 9 rv, perf, rtla, kernel, bpftool, libperf, +83 more Red Hat Enterprise Linux 10 kernel Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-8, openshift/ose-rhel-coreos-9 Red Hat OpenShift Container Platform 5 openshift/ose-rhel-coreos-9affected: workaround, no fix available “Fix deferred”
-
Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 morenot affected: vulnerable code not present
Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- 23 d ago
Exploit prediction
0.14% chance of exploitation in the next 30 days, higher than 3% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 9.3 | CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H |
Affected products
- Linux Linux
Classification
- Technology feeds
References
- git.kernel.org /stable/c/3fd2b60ea9bd18348f5e971678f31041ef211047
- git.kernel.org /stable/c/579eb867d3da63f3b5e32f235925e1daa7ec70d0
- git.kernel.org /stable/c/aaeb81241e802c86be69394f72d49fde3f861fbb
- git.kernel.org /stable/c/45705a6bfdb283f7b3b509010fd617b72f942537
- git.kernel.org /stable/c/87bc611c6c98a41c00feb7b06b0c297dd141a2ae
- git.kernel.org /stable/c/607432b2618b61df81134be0ef2562b8300c1216
Sources
- CVE List CVE-2026-89448
- NVD CVE-2026-89448
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.