CVE catalog
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 E
- Severity
- Medium · CVSS 5.5
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.12% · Oct 25, 2026
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).
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | efivar | sid | 39-2 | vulnerable |
| Debian | efivar | forky | 39-2 | vulnerable |
| Debian | efivar | trixie | 38-3.1 | vulnerable |
| Debian | efivar | bookworm | 37-6 | vulnerable |
| Cpe | efivar | Not reported | Not reported | vulnerable |
| Cpe | libefiboot | Not reported | Not reported | unknown |
| Cpe | libefiboot | Not reported | Not reported | unknown |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | efivar | source | sid | (unfixed) | not yet assigned | Not reported | [1134691] |
| Debian | efivar | source | forky | (unfixed) | not yet assigned | Not reported | [1134691] |
| Debian | efivar | source | trixie | (unfixed) | not yet assigned | Not reported | [1134691] |
| Debian | efivar | source | bookworm | (unfixed) | not yet assigned | Not reported | [1134691] |
Notes
[trixie] efivar: Minor issue [bookworm] efivar: Minor issue
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [efivar]Affected
Details (2)
37-6· amd64 · bookwormAffected
nvd · efivar · debian · bookworm; nvd · efivar · debian · 12
37-6· arm64 · bookwormAffected
nvd · efivar · debian · bookworm; nvd · efivar · debian · 12
- [libefiboot1]Affected
Source package: [efivar]
Details (2)
37-6· amd64 · bookwormAffected
nvd · efivar · debian · bookworm; nvd · efivar · debian · 12
37-6· arm64 · bookwormAffected
nvd · efivar · debian · bookworm; nvd · efivar · debian · 12
- [libefiboot-dev]Affected
Source package: [efivar]
Details (2)
37-6· amd64 · bookwormAffected
nvd · efivar · debian · bookworm; nvd · efivar · debian · 12
37-6· arm64 · bookwormAffected
nvd · efivar · debian · bookworm; nvd · efivar · debian · 12
- [libefivar1]Affected
Source package: [efivar]
Details (2)
37-6· amd64 · bookwormAffected
nvd · efivar · debian · bookworm; nvd · efivar · debian · 12
37-6· arm64 · bookwormAffected
nvd · efivar · debian · bookworm; nvd · efivar · debian · 12
- [libefivar-dev]Affected
Source package: [efivar]
Details (2)
37-6· amd64 · bookwormAffected
nvd · efivar · debian · bookworm; nvd · efivar · debian · 12
37-6· arm64 · bookwormAffected
nvd · efivar · debian · bookworm; nvd · efivar · debian · 12
[Debian 13 (Trixie)]
- [efivar]Affected
Details (4)
38-3.1+b1· amd64 · trixieAffected
nvd · efivar · debian · 13
38-3.1+b1· arm64 · trixieAffected
nvd · efivar · debian · 13
39-2~bpo13+1· amd64 · trixie-backportsAffected
nvd · efivar · debian · 13
39-2~bpo13+1· arm64 · trixie-backportsAffected
nvd · efivar · debian · 13
- [libefiboot1t64]Affected
Source package: [efivar]
Details (4)
38-3.1+b1· amd64 · trixieAffected
nvd · efivar · debian · 13
38-3.1+b1· arm64 · trixieAffected
nvd · efivar · debian · 13
39-2~bpo13+1· amd64 · trixie-backportsAffected
nvd · efivar · debian · 13
39-2~bpo13+1· arm64 · trixie-backportsAffected
nvd · efivar · debian · 13
- [libefiboot-dev]Affected
Source package: [efivar]
Details (4)
38-3.1+b1· amd64 · trixieAffected
nvd · efivar · debian · 13
38-3.1+b1· arm64 · trixieAffected
nvd · efivar · debian · 13
39-2~bpo13+1· amd64 · trixie-backportsAffected
nvd · efivar · debian · 13
39-2~bpo13+1· arm64 · trixie-backportsAffected
nvd · efivar · debian · 13
- [libefisec1t64]Affected
Source package: [efivar]
Details (4)
38-3.1+b1· amd64 · trixieAffected
nvd · efivar · debian · 13
38-3.1+b1· arm64 · trixieAffected
nvd · efivar · debian · 13
39-2~bpo13+1· amd64 · trixie-backportsAffected
nvd · efivar · debian · 13
39-2~bpo13+1· arm64 · trixie-backportsAffected
nvd · efivar · debian · 13
- [libefisec-dev]Affected
Source package: [efivar]
Details (4)
38-3.1+b1· amd64 · trixieAffected
nvd · efivar · debian · 13
38-3.1+b1· arm64 · trixieAffected
nvd · efivar · debian · 13
39-2~bpo13+1· amd64 · trixie-backportsAffected
nvd · efivar · debian · 13
39-2~bpo13+1· arm64 · trixie-backportsAffected
nvd · efivar · debian · 13
- [libefivar1t64]Affected
Source package: [efivar]
Details (4)
38-3.1+b1· amd64 · trixieAffected
nvd · efivar · debian · 13
38-3.1+b1· arm64 · trixieAffected
nvd · efivar · debian · 13
39-2~bpo13+1· amd64 · trixie-backportsAffected
nvd · efivar · debian · 13
39-2~bpo13+1· arm64 · trixie-backportsAffected
nvd · efivar · debian · 13
- [libefivar-dev]Affected
Source package: [efivar]
Details (4)
38-3.1+b1· amd64 · trixieAffected
nvd · efivar · debian · 13
38-3.1+b1· arm64 · trixieAffected
nvd · efivar · debian · 13
39-2~bpo13+1· amd64 · trixie-backportsAffected
nvd · efivar · debian · 13
39-2~bpo13+1· arm64 · trixie-backportsAffected
nvd · efivar · debian · 13
Observed:
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]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-6862]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-6862]
- [https://security-tracker.debian.org/tracker/CVE-2026-6862]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-6862.json]
[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]