What is CVE-2026-43220?

CVE-2026-43220 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10, affecting Linux kernel versions from 6.6.128 onward. CVE-2026-43220 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-43220?

CVE-2026-43220 has a CVSS score of 5.5 out of 10, rated Medium severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

Is there a patch available for CVE-2026-43220?

No patch is currently available for CVE-2026-43220. Monitor the NIST NVD and your Linux distribution's security advisories for updates.

Is CVE-2026-43220 actively exploited?

CVE-2026-43220 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2026-43220

Medium

In the Linux kernel, the following vulnerability has been resolved: iommu/amd: serialize sequence allocation under concurrent TLB invalidations With concurrent TLB invalidations, completion wait randomly gets timed out because cmd_sem_val was incremented outside the IOMMU spinlock, allowing CMD_COMPL_WAIT commands to be queued out of sequence and breaking the ordering assumption in wait_on_sem(). Move the cmd_sem_val increment under iommu->lock so completion sequence allocation is serialized with command queuing. And remove the unnecessary return.

Package Linux Kernel

Published 2026-05-06

Last modified 2026-05-17

CVSS version 3.1

Patch available

Not yet patched

CVSS 3.1 score

5.5

out of 10

Medium

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

High

Vector string

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

Affected versions

Linux kernel versions 6.6.128, 6.12.75 and later are affected. No fixed version recorded yet.

Affected from

≥ 6.6.128 ≥ 6.12.75

References

The following references provide additional information about CVE-2026-43220 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/48caa7542a795c9679ec1bd1bc2592e05a7369a4
Patch
Kernel patch commit
https://git.kernel.org/stable/c/5000ce7fcb31067566a1a1a2e5b5bbff93625242
Patch
Kernel patch commit
https://git.kernel.org/stable/c/9e249c48412828e807afddc21527eb734dc9bd3d
Patch

5 patch commits total View all on NVD

Details

CVE ID CVE-2026-43220

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2026-05-06

Modified 2026-05-17

KEV No

Patch

Not yet patched

Package linux

Frequently asked questions

What is CVE-2026-43220?

CVE-2026-43220 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 . It affects Linux kernel versions from 6.6.128 onward . CVE-2026-43220 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-43220?

CVE-2026-43220 has a CVSS score of 5.5 out of 10, rated Medium severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
Is there a patch available for CVE-2026-43220?

No patch is currently available for CVE-2026-43220. Monitor the NIST NVD and your Linux distribution's security advisories for updates.
Is CVE-2026-43220 actively exploited?

No — CVE-2026-43220 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.