Vulnerability · Published Apr 22, 2026 · Assigned by redhat
CVE-2026-6862Efivar: efivar: denial of service due to stack overflow in device path node parsing
Medium 5.5
In plain English
A medium-severity security flaw in Red Hat Enterprise Linux 10 from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 2% of all known vulnerabilities).
Official 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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | efivar | no fix listed | DEBIAN-CVE-2026-6862 |
| Debian:13 | efivar | no fix listed | DEBIAN-CVE-2026-6862 |
| Debian:14 | efivar | no fix listed | DEBIAN-CVE-2026-6862 |
| Ubuntu:22.04:LTS | efivar | no fix listed | UBUNTU-CVE-2026-6862 |
| Ubuntu:24.04:LTS | efivar | no fix listed | UBUNTU-CVE-2026-6862 |
| Ubuntu:25.10 | efivar | no fix listed | UBUNTU-CVE-2026-6862 |
| Ubuntu:26.04:LTS | efivar | no fix listed | UBUNTU-CVE-2026-6862 |
| Ubuntu:26.10 | efivar | no fix listed | UBUNTU-CVE-2026-6862 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Red Hat | Red Hat Hardened Images | see references |
| Red Hat | Red Hat Enterprise Linux 10 | see references |
| Red Hat | Red Hat Enterprise Linux 7 | see references |
| Red Hat | Red Hat Enterprise Linux 8 | see references |
| Red Hat | Red Hat Enterprise Linux 9 | see references |
| Red Hat | Red Hat OpenShift Container Platform 4 | see references |
| Red Hat | Red Hat OpenShift Container Platform 4 | see references |
Weakness: CWE-674 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
References
- RHSA-2026:69321 vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/security/cve/CVE-2026-6862 vdb-entry, x_refsource_REDHAT
- RHBZ#2459982 issue-tracking, x_refsource_REDHAT