CVE-2026-6862: A flaw was found in libefiboot, a component of efivar

Routine

MEDIUM 5.5WATCHLISTMITIGATE

CVE-2026-6862 is a medium-severity flaw (CVSS 5.5) affecting libefiboot. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A flaw was found in libefiboot, a component of efivar. The device path node parser in libefiboot fails to validate that each node's Length field is at least 4 bytes, which is the minimum size for an EFI (Extensible Firmware Interface) device path node header. A local user could exploit this vulnerability by providing a specially crafted device path node. This can lead to infinite recursion, causing stack exhaustion and a process crash, resulting

Why this priority

On your watchlist

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	5.5 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.1% (top 98%)
CISA exploited list	No
Weakness	CWE-674
Published	2026-04-22
Last modified	2026-10-26

Publisher (CNA): Red Hat, Inc. · Vendor: ubuntu

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-22 14:17 UTCPublished CVE record published
2026-10-26 21:10 UTCUpdated Record last modified

ubuntu libefiboot MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy libefiboot || rpm -q libefiboot || libefiboot --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

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-2026-6862?

libefiboot: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-6862 being exploited?

CVE-2026-6862 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-2026-6862 affect?

CVE-2026-6862 affects libefiboot. Severity is medium (CVSS 5.5). A flaw was found in libefiboot, a component of efivar. The device path node parser in libefiboot fails to validate that each node's Length field is at least 4 bytes, which is the minimum size for an EFI (Extensible Firmware Interface) devic

How urgent is CVE-2026-6862?

Priority 25/100. On your watchlist

Software pages

Ubuntu vulnerabilities

References

← Back to latest CVEs