CVE-2026-21399: Heap-based buffer overflow for the Intel(R) Open Volume Kernel Library (Intel(R) Open VKL) library maintained

Q: How do I fix CVE-2026-21399?

open vkl: upgrade to 2.0.2. Exact commands for each OS are on this page.

Q: Is CVE-2026-21399 being exploited?

CVE-2026-21399 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-2026-21399 affect?

CVE-2026-21399 affects open vkl. Severity is medium (CVSS 6.1). Heap-based buffer overflow for the Intel(R) Open Volume Kernel Library (Intel(R) Open VKL) library maintained by intel(R) before version 2.0.2 within Ring 3: User Applications may allow a denial of service. System software adversary with an

Q: How urgent is CVE-2026-21399?

Priority 22/100. No elevated risk signals yet.

Routine

MEDIUM 6.1UPGRADE

CVE-2026-21399 is a medium-severity flaw (CVSS 6.1) affecting open vkl. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Heap-based buffer overflow for the Intel(R) Open Volume Kernel Library (Intel(R) Open VKL) library maintained by intel(R) before version 2.0.2 within Ring 3: User Applications may allow a denial of service. System software adversary with an authenticated user combined with a low complexity attack may enable denial of service. This result may potentially occur via local access when attack requirements are not present without special internal knowl

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.1% (top 99%)
CISA exploited list	No
Weakness	CWE-122
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 20:47 UTCUpdated Record last modified

intel open vkl UPGRADE

Affected: < 2.0.2

Fixed in: 2.0.2

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy open-vkl || rpm -q open-vkl || open-vkl --version

2. UPGRADE to 2.0.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade open-vkl

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade open-vkl

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-2026-21399?

open vkl: upgrade to 2.0.2. Exact commands for each OS are on this page.

Is CVE-2026-21399 being exploited?

CVE-2026-21399 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-2026-21399 affect?

CVE-2026-21399 affects open vkl. Severity is medium (CVSS 6.1). Heap-based buffer overflow for the Intel(R) Open Volume Kernel Library (Intel(R) Open VKL) library maintained by intel(R) before version 2.0.2 within Ring 3: User Applications may allow a denial of service. System software adversary with an

How urgent is CVE-2026-21399?

Priority 22/100. No elevated risk signals yet.

Software pages

Intel vulnerabilities

References

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