Vulnerability in Linux

CVE-2026-43220

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.

Published · last modified .

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.002 (4.7th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 5th percentile — 4.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2026-43220: held from 0.001 to 0.002.

EPSS over last 30 days · oldest: 0.001 · newest: 0.002 · change: +0.000

Affected products

  • Linux — versions 715c263119fd1b918a9fcbd8a36ea5b604a46324, 496269d12072ecb219826485bdbec70c92a8eef5, d2a0cac10597068567d336e85fa3cbdbe8ca62bf
  • Linux Kernel

References

Frequently asked questions

What is CVE-2026-43220?
CVE-2026-43220 is a medium-severity vulnerability in Linux. CVSS score: 5.5/10. Published 2026-05-06.
How severe is CVE-2026-43220?
Medium severity. CVSS v3 base score is 5.5 out of 10.