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NVD / CVE Program· CNA Linux

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

Noroxi assessment

Priority: Monitor (action score 22/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.12% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 48caa7542a795c9679ec1bd1bc2592e05a7369a4, 5000ce7fcb31067566a1a1a2e5b5bbff93625242, 6.12.88.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 48caa7542a795c9679ec1bd1bc2592e05a7369a4, 5000ce7fcb31067566a1a1a2e5b5bbff93625242, 6.12.88 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
May 6, 2026
Updated
Oct 30, 2026
EPSS
0.1% · 2th percentile
CWE
—

Report tools

JSON

Action score

22

Monitor

Low priority for now.

CVSS
22 / 40 · 5.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-43220

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
linuxlinux kernel

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • linux linux kernel6.6.128 and later · before 6.7
  • linux linux kernel6.12.75 and later · before 6.13

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 69d9339c02eddfc2a345be7220651068a3684383affected
    • f2f65b28d802a667119147444ec2ae33eebf9a58 and later · before d51bf43193b1e95dc4e34e540dc76e19def2ae5aaffected · git
    • 715c263119fd1b918a9fcbd8a36ea5b604a46324 and later · before fca7aa0264ae99e5ff287d0ced5af0b82b121c4faffected · git
    • e15768e68820142077bbca402d8e902f64ade1b0 and later · before 5000ce7fcb31067566a1a1a2e5b5bbff93625242affected · git
    • 496269d12072ecb219826485bdbec70c92a8eef5 and later · before 48caa7542a795c9679ec1bd1bc2592e05a7369a4affected · git
    • d2a0cac10597068567d336e85fa3cbdbe8ca62bf and later · before 9e249c48412828e807afddc21527eb734dc9bd3daffected · git
    • 6.1.191 and later · before 6.2affected · semver
    • 6.6.128 and later · before 6.6.140affected · semver
    • 6.12.75 and later · before 6.12.88affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:13linuxbefore 6.12.88-16.12.88-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now

Published before and after this one in the same product

  • ← EarlierCVE-2026-43215May 6, 2026 · cifs: Fix locking usage for tcon fields
    35Monitor
  • ← EarlierCVE-2026-43216May 6, 2026 · net: Drop the lock in skb_may_tx_timestamp()
    22Monitor
  • Later →CVE-2026-43228May 6, 2026 · hfs: Replace BUG_ON with error handling for CNID count checks
    22Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux48caa7542a795c9679ec1bd1bc2592e05a7369a4Vendor (CNA)
Linux Linux5000ce7fcb31067566a1a1a2e5b5bbff93625242Vendor (CNA)
Linux Linux6.12.88Vendor (CNA)
Linux Linux6.2Vendor (CNA)
Linux Linux6.6.140Vendor (CNA)
Linux Linux9e249c48412828e807afddc21527eb734dc9bd3dVendor (CNA)
Linux Linuxd51bf43193b1e95dc4e34e540dc76e19def2ae5aVendor (CNA)
Linux Linuxfca7aa0264ae99e5ff287d0ced5af0b82b121c4fVendor (CNA)
debian:linux6.12.88-1 · Debian:13Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

—

CVSS vector

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

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (4 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records