CVE-2026-21400: Protection mechanism failure for some Intel(R) AI Reference Models before version v3.4.1 within Ring 3: User A

Q: How do I fix CVE-2026-21400?

ai reference models: upgrade to 3.4.1. Exact commands for each OS are on this page.

Q: Is CVE-2026-21400 being exploited?

CVE-2026-21400 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-21400 affect?

CVE-2026-21400 affects ai reference models. Severity is medium (CVSS 6.7). Protection mechanism failure for some Intel(R) AI Reference Models before version v3.4.1 within Ring 3: User Applications may allow an escalation of privilege. Unprivileged software adversary with a privileged user combined with a low compl

Q: How urgent is CVE-2026-21400?

Priority 25/100. No elevated risk signals yet.

Routine

MEDIUM 6.7UPGRADE

CVE-2026-21400 is a medium-severity flaw (CVSS 6.7) affecting ai reference models. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Protection mechanism failure for some Intel(R) AI Reference Models before version v3.4.1 within Ring 3: User Applications may allow an escalation of privilege. Unprivileged software adversary with a privileged user combined with a low complexity attack may enable escalation of privilege. This result may potentially occur via local access when attack requirements are present without special internal knowledge and requires passive user interaction.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.7 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	0.2% (top 95%)
CISA exploited list	No
Weakness	CWE-693
Published	2026-08-11
Last modified	2026-10-15

Publisher (CNA): Intel Corporation · Vendor: intel

Last updated 2026-10-15 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-08-11 17:17 UTCPublished CVE record published
2026-10-15 20:43 UTCUpdated Record last modified

intel ai reference models UPGRADE

Affected: < 3.4.1

Fixed in: 3.4.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy ai-reference-models || rpm -q ai-reference-models || ai-reference-models --version

2. UPGRADE to 3.4.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade ai-reference-models

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade ai-reference-models

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-21400?

ai reference models: upgrade to 3.4.1. Exact commands for each OS are on this page.

Is CVE-2026-21400 being exploited?

CVE-2026-21400 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-21400 affect?

CVE-2026-21400 affects ai reference models. Severity is medium (CVSS 6.7). Protection mechanism failure for some Intel(R) AI Reference Models before version v3.4.1 within Ring 3: User Applications may allow an escalation of privilege. Unprivileged software adversary with a privileged user combined with a low compl

How urgent is CVE-2026-21400?

Priority 25/100. No elevated risk signals yet.

Software pages

Intel vulnerabilities

References

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