How severe is CVE-2026-6862?

CVE-2026-6862 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-6862 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (1st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-6862?

CVE-2026-6862 affects Ubuntu Libefiboot. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-6862?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-6862 have an EU (EUVD) identifier?

Yes. CVE-2026-6862 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-24957.

When was CVE-2026-6862 published?

CVE-2026-6862 was published on 2026-04-22 and last updated on 2026-06-17.

CVE-2026-6862

CVE-2026-6862 is a medium-severity vulnerability in Ubuntu Libefiboot with a CVSS 3.x base score of 5.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-674.

Key facts

Severity: Medium (CVSS 3.x base score 5.5)
EPSS exploit prediction: 0% (1st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-24957
Weakness: CWE-674
Affected product: Ubuntu Libefiboot
Published: 2026-04-22
Last modified: 2026-06-17

Description

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 in a denial of service (DoS).

Frequently asked questions

What is CVE-2026-6862?: 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 in a denial of service (DoS).
How severe is CVE-2026-6862?: CVE-2026-6862 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-6862 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (1st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-6862?: CVE-2026-6862 affects Ubuntu Libefiboot. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-6862?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-6862 have an EU (EUVD) identifier?: Yes. CVE-2026-6862 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-24957.
When was CVE-2026-6862 published?: CVE-2026-6862 was published on 2026-04-22 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:ubuntu:libefiboot:-:*:*:*:*:*:*:*

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