What is CVE-2026-89448?

CVE-2026-89448 is a Critical severity Linux kernel vulnerability with a CVSS score of 9.3 out of 10, affecting Linux kernel versions from 2.6.33 onward and patched in 6.6.157, 6.12.109, 6.18.50 and others. CVE-2026-89448 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-89448?

CVE-2026-89448 has a CVSS score of 9.3 out of 10, rated Critical severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H.

Is there a patch available for CVE-2026-89448?

Yes, CVE-2026-89448 has been patched. Fixed versions include 6.6.157, 6.12.109, 6.18.50 and others. If you are running Linux kernel 2.6.33 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-89448 actively exploited?

CVE-2026-89448 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2026-89448

Critical

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().

Package Linux Kernel

Published 2026-09-11

Last modified 2026-09-14

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

9.3

out of 10

Critical

Attack Vector

Local

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

Vector string

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

Affected versions

Linux kernel versions 2.6.33 and later are affected. Fixed in 6.6.157, 6.12.109, 6.18.50, 7.2.4, 7.3-rc1 and their respective stable series.

Affected from

≥ 2.6.33

Fixed in

✓ 6.6.157 6.6.x ✓ 6.12.109 6.12.x ✓ 6.18.50 6.18.x ✓ 7.2.4 7.2.x ✓ 7.3-rc1

References

5 total

Details

CVE ID CVE-2026-89448

Severity Critical

CVSS score 9.3 / 10

CVSS version 3.1

Published 2026-09-11

Modified 2026-09-14

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2026-89448?

CVE-2026-89448 is a Critical severity Linux kernel vulnerability with a CVSS score of 9.3 out of 10 . It affects Linux kernel versions from 2.6.33 onward and has been patched in 6.6.157, 6.12.109, 6.18.50 and others. CVE-2026-89448 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-89448?

CVE-2026-89448 has a CVSS score of 9.3 out of 10, rated Critical severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H.
Is there a patch available for CVE-2026-89448?

Yes. CVE-2026-89448 has been patched. Fixed versions include 6.6.157, 6.12.109, 6.18.50 and others. If you are running Linux kernel 2.6.33 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-89448 actively exploited?

No. CVE-2026-89448 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.