What is CVE-2026-43133?

CVE-2026-43133 is a High severity Linux kernel vulnerability with a CVSS score of 7.9 out of 10, affecting Linux kernel versions from 5.13 onward and patched in 5.15.202, 6.1.165, 6.6.128 and others. CVE-2026-43133 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-43133?

CVE-2026-43133 has a CVSS score of 7.9 out of 10, rated High severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:H.

Is there a patch available for CVE-2026-43133?

Yes, CVE-2026-43133 has been patched. Fixed versions include 5.15.202, 6.1.165, 6.6.128 and others. If you are running Linux kernel 5.13 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-43133 actively exploited?

CVE-2026-43133 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2026-43133

High

In the Linux kernel, the following vulnerability has been resolved: KVM: nSVM: Always use vmcb01 in VMLOAD/VMSAVE emulation Commit cc3ed80ae69f ("KVM: nSVM: always use vmcb01 to for vmsave/vmload of guest state") made KVM always use vmcb01 for the fields controlled by VMSAVE/VMLOAD, but it missed updating the VMLOAD/VMSAVE emulation code to always use vmcb01. As a result, if VMSAVE/VMLOAD is executed by an L2 guest and is not intercepted by L1, KVM will mistakenly use vmcb02. Always use vmcb01 instead of the current VMCB.

Package Linux Kernel

Published 2026-05-06

Last modified 2026-05-08

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

7.9

out of 10

High

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

High

Vector string

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

Affected versions

Linux kernel versions 5.13 and later are affected. Fixed in 5.15.202, 6.1.165, 6.6.128, 6.12.75, 6.18.16, 6.19.6, 7.0 and their respective stable series.

Affected from

≥ 5.13

Fixed in

✓ 5.15.202 5.15.x ✓ 6.1.165 6.1.x ✓ 6.6.128 6.6.x ✓ 6.12.75 6.12.x ✓ 6.18.16 6.18.x ✓ 6.19.6 6.19.x ✓ 7.0

References

The following references provide additional information about CVE-2026-43133 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

Kernel patch commit
https://git.kernel.org/stable/c/0004ecb798b30e90d7ebfe74efae2d9423315a64
Patch
Kernel patch commit
https://git.kernel.org/stable/c/10063e1251c1485034a018236080792ad083dcc5
Patch
Kernel patch commit
https://git.kernel.org/stable/c/127ccae2c185f62e6ecb4bf24f9cb307e9b9c619
Patch

7 patch commits total View all on NVD

Details

CVE ID CVE-2026-43133

Severity High

CVSS score 7.9 / 10

CVSS version 3.1

Published 2026-05-06

Modified 2026-05-08

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2026-43133?

CVE-2026-43133 is a High severity Linux kernel vulnerability with a CVSS score of 7.9 out of 10 . It affects Linux kernel versions from 5.13 onward and has been patched in 5.15.202, 6.1.165, 6.6.128 and others. CVE-2026-43133 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-43133?

CVE-2026-43133 has a CVSS score of 7.9 out of 10, rated High severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:H.
Is there a patch available for CVE-2026-43133?

Yes — CVE-2026-43133 has been patched. Fixed versions include 5.15.202, 6.1.165, 6.6.128 and others. If you are running Linux kernel 5.13 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-43133 actively exploited?

No — CVE-2026-43133 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.