CVE-2026-6862
Efivar: efivar: denial of service due to stack overflow in device path node parsing
- State
- Published
- Severity
- 5.5 Medium
- Published
- Apr 22, 2026
- Updated
- Sep 21, 2026
- Reserved
- Apr 22, 2026
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).
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 5.5 Medium | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H | redhat |
Weaknesses
- CWE-674 Uncontrolled Recursion
Affected Products
| Product | Versions |
|---|---|
Red Hat Hardened ImagesRed Hat |
|
Red Hat Enterprise Linux 10Red Hat | |
Red Hat Enterprise Linux 7Red Hat | |
Red Hat Enterprise Linux 8Red Hat | |
Red Hat Enterprise Linux 9Red Hat | |
Red Hat OpenShift Container Platform 4Red Hat | |
Red Hat OpenShift Container Platform 4Red Hat |
References
- RHSA-2026:69321vendor-advisory
- https://access.redhat.com/security/cve/CVE-2026-6862vdb-entry
- RHBZ#2459982issue-tracking
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