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 and patched in 6.6.140 and 6.12.88. 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?

Yes, CVE-2026-43220 has been patched. Fixed versions include 6.6.140 and 6.12.88. If you are running Linux kernel 6.6.128 or later up to the fix versions, apply the relevant patch for your kernel branch.

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

Yes

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. Fixed in 6.6.140, 6.12.88 and their respective stable series.

Affected from

≥ 6.6.128 ≥ 6.12.75

Fixed in

✓ 6.6.140 6.6.x ✓ 6.12.88 6.12.x

References

5 total

Kernel Git
https://git.kernel.org/stable/c/48caa7542a795c9679ec1bd1bc2592e05a7369a4

Patch
Kernel Git
https://git.kernel.org/stable/c/5000ce7fcb31067566a1a1a2e5b5bbff93625242

Patch
Kernel Git
https://git.kernel.org/stable/c/9e249c48412828e807afddc21527eb734dc9bd3d

Patch
Kernel Git
https://git.kernel.org/stable/c/d51bf43193b1e95dc4e34e540dc76e19def2ae5a
Kernel Git
https://git.kernel.org/stable/c/fca7aa0264ae99e5ff287d0ced5af0b82b121c4f

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

Yes

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 and has been patched in 6.6.140 and 6.12.88. 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?

Yes. CVE-2026-43220 has been patched. Fixed versions include 6.6.140 and 6.12.88. If you are running Linux kernel 6.6.128 or later up to the fix versions, apply the relevant patch for your kernel branch.
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.