5.5

CVE-2026-43220: iommu/amd: serialize sequence allocation under concurrent TLB invalidations

Modified
AliasesUBUNTU-CVE-2026-43220DEBIAN-CVE-2026-43220CGA-83hm-h943-jxjx
Published 06-05-2026Last modified 30-10-2026

Vulnerability summary

CVE-2026-43220 is a medium (CVSS 5.5) vulnerability in linux. EPSS estimates a 0.13% chance of exploitation in the next 30 days, higher than 2.4% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 5.5, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
5.5/10
010
Medium · v3.1 (NVD)
EPSS score
0.13%
0%100%
Low · -0.03 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 12 · Related 13
OPENSUSE-SU-2026:21555-1SUSE-SU-2026:23066-1SUSE-SU-2026:23068-1SUSE-SU-2026:23193-1SUSE-SU-2026:23194-1SUSE-SU-2026:23221-1

Timeline

  1. 06-05-2026
    PublishedVulnerability first disclosed.
  2. 30-10-2026
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

4 scores · 3 sources · 2 versions

EPSS trend

Probability

0.13%

Chance of exploitation in the next 30 days

Percentile

2%

Versus all other CVEs

30-day change

Decrease -0.03 pp

From 0.16% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu159 products
  • linuxAll versions (No fix recorded)
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded)
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Chainguard5 products
  • linux-aws-6.12< 6.12.85-r3
  • linux-azure-6.12All versions (No fix recorded)
  • linux-gcp-6.12All versions (No fix recorded)
  • linux-qemu-6.12All versions (No fix recorded)
  • linux-vmware-6.12< 6.12.85-r2
Linux2 products
  • linux≥ f2f65b28d802a667119147444ec2ae33eebf9a58, < d51bf43193b1e95dc4e34e540dc76e19def2ae5a | ≥ 715c263119fd1b918a9fcbd8a36ea5b604a46324, < fca7aa0264ae99e5ff287d0ced5af0b82b121c4f | ≥ e15768e68820142077bbca402d8e902f64ade1b0, < 5000ce7fcb31067566a1a1a2e5b5bbff93625242 | ≥ 496269d12072ecb219826485bdbec70c92a8eef5, < 48caa7542a795c9679ec1bd1bc2592e05a7369a4 | ≥ d2a0cac10597068567d336e85fa3cbdbe8ca62bf, < 9e249c48412828e807afddc21527eb734dc9bd3d | 69d9339c02eddfc2a345be7220651068a3684383 | ≥ 6.1.191, < 6.2 | ≥ 6.6.128, < 6.6.140 | ≥ 6.12.75, < 6.12.88
  • linux_kernel≥ 6.6.128, < 6.7 | ≥ 6.12.75, < 6.13
Debian1 product
  • linux< 6.12.88-1

4 vendors · 167 products

References

10 links