What’s Vulnerable › Vulnerabilities

CVE-2026-6862: Efivar: efivar: denial of service due to stack overflow in device path node parsing

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-04-22 · updated 2026-10-26
• Weakness: CWE-674

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).

Affected products

• Ubuntu Libefiboot: all versions

References

• https://access.redhat.com/errata/RHSA-2026:69321
• https://access.redhat.com/security/cve/CVE-2026-6862
• https://bugzilla.redhat.com/show_bug.cgi?id=2459982

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