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CVE-2026-6862

Efivar: efivar: denial of service due to stack overflow in device path node parsing

5.5 MediumFix available

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).

Attack profile

How easy it is to exploit

Attack vector
Local
Complexity
Low
Privileges needed
None
User interaction
Required

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
High

Exploit likelihood

0.12%Up 0.1 points since Apr 23, 2026
90%50%10%1%

What each source reports

CVE List Score used 5.5

Efivar: efivar: denial of service due to stack overflow in device path node parsing

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).

Record
CVE-2026-6862
CVSS 3.1
5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Weakness
CWE-674
Updated
2026-11-02
EUVDEUVD-2026-24957 5.5

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).

Record
EUVD-2026-24957
CVSS 3.1
5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated
2026-11-02
GitHub AdvisoriesGHSA-364h-vxjm-52rp 5.5

A flaw was found in libefiboot, a component of efivar. The device path node parser in libefiboot...

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).

Record
GHSA-364h-vxjm-52rp
CVSS 3.1
5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Weakness
CWE-674
Updated
2026-11-02
NVD 5.5

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).

Record
CVE-2026-6862
CVSS 3.1
5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Weakness
CWE-674
Updated
2026-11-02
OSVDEBIAN-CVE-2026-6862 5.5

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).

Record
DEBIAN-CVE-2026-6862
CVSS 3.1
5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVOESA-2026-4450 5.5

efivar security update

Some command line interface of the UEFI variables tools are offered by .

Security Fix(es):

A flaw was found in libefiboot, a component of the efivar project. 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).(CVE-2026-6862)

Record
OESA-2026-4450
CVSS 3.1
5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVRHSA-2026:69321 5.5

Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update

Record
RHSA-2026:69321
CVSS 3.1
5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2026-6862 5.5

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).

Record
UBUNTU-CVE-2026-6862
CVSS 3.1
5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVopenSUSE-SU-2026:12378-1 No score

efivar-39-1.1 on GA media

These are all security issues fixed in the efivar-39-1.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2026:12378-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
efivar
Debian:12
 All versions, plus listed versions
37-638-138-238-338-3.1
Show 4 moreShow less
38-3.1~exp139-139-239-2~bpo13+1
 None known
efivar
Debian:13
 All versions, plus listed versions
38-3.139-139-239-2~bpo13+1
 None known
efivar
Debian:14
 All versions, plus listed versions
38-3.139-139-239-2~bpo13+1
 None known
efivar
openEuler:24.03-LTS-SP3
 before 38-9.oe2403sp3
38-9.oe2403sp3
efivar
Red Hat:hummingbird:1
 before 0:39-13.1.hum1
0:39-13.1.hum1
efivar-devel
Red Hat:hummingbird:1
 before 0:39-13.1.hum1
0:39-13.1.hum1
efivar-libs
Red Hat:hummingbird:1
 before 0:39-13.1.hum1
0:39-13.1.hum1
efivar
Ubuntu:14.04:LTS
 All versions, plus listed versions
0.21-1~14.04.2
 None known
efivar
Ubuntu:16.04:LTS
 All versions, plus listed versions
0.21-10.23-10.23-2
 None known
efivar
Ubuntu:18.04:LTS
 All versions, plus listed versions
31-132-132-234-1
 None known
Show 7 moreShow less
Affected packages
PackageAffectedFixed
efivar
Ubuntu:20.04:LTS
 All versions, plus listed versions
37-2ubuntu237-2ubuntu2.137-2ubuntu2.2
 None known
efivar
Ubuntu:22.04:LTS
 All versions, plus listed versions
37-6ubuntu2
 None known
efivar
Ubuntu:24.04:LTS
 All versions, plus listed versions
37-6ubuntu338-338-3.138-3.1build1
 None known
efivar
Ubuntu:25.10
 All versions, plus listed versions
38-3.1build1
 None known
efivar
Ubuntu:26.10
 All versions, plus listed versions
39-2
 None known
efivar
Ubuntu:26.04:LTS
 All versions, plus listed versions
38-3.1build139-2
 None known
efivar
openSUSE:Tumbleweed
 before 39-1.1
39-1.1

History

History
RecordedChangedSources
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-6862 is a medium vulnerability (CVSS 5.5) in Ubuntu Libefiboot, published April 22, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.12%, the 1st percentile. Fixed in efivar 38-9.oe2403sp3.

References

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