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
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Red Hat | Red Hat Hardened Images | — | — |
| Red Hat | Red Hat Enterprise Linux 10 | — | — |
| Red Hat | Red Hat Enterprise Linux 7 | — | — |
| Red Hat | Red Hat Enterprise Linux 8 | — | — |
| Red Hat | Red Hat Enterprise Linux 9 | — | — |
| Red Hat | Red Hat OpenShift Container Platform 4 | — | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | efivar | No fix yet | — |
| Debian 13 | efivar | No fix yet | — |
| Debian 12 | efivar | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | efivar | No fix yet | — |
| Ubuntu 26.04 LTS | efivar | No fix yet | — |
| Ubuntu 25.10 | efivar | No fix yet | — |
| Ubuntu 24.04 LTS | efivar | No fix yet | — |
| Ubuntu 22.04 LTS | efivar | No fix yet | — |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | efivar | No fix yet | — |
| Ubuntu 18.04 LTS | efivar | No fix yet | — |
| Ubuntu 16.04 LTS | efivar | No fix yet | — |
| Ubuntu 14.04 LTS | efivar | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Hardened Images 1 | efivar +2 | 39-13.1.hum1 | RHSA-2026:69321 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP5 | efivar | 31-3.6.1 | SUSE-SU-2026:5213-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | efivar | 39-1.1 | openSUSE-SU-2026:12378-1 |
Advisories 3
- SUSE-SU-2026:5213-1 Security update for efivar SUSE / openSUSE Security Updates · Nov 13, 2026
- openSUSE-SU-2026:12378-1 efivar-39-1.1 on GA media SUSE / openSUSE Security Updates · Nov 2, 2026
- RHSA-2026:69321 Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update Red Hat Security Advisories (RHSA) · Sep 22, 2026
References
- RHSA-2026:69321 vendor-advisory
- https://access.redhat.com/security/cve/CVE-2026-6862 vdb-entry
- RHBZ#2459982 issue-tracking