Use of Uninitialized Variable in Linux kernel - CVE-2026-68461

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Main Vulnerability Database Vulnerabilities #VU143614

Use of Uninitialized Variable in Linux kernel - CVE-2026-68461

Published: August 17, 2026


Vulnerability identifier: #VU143614
CSH Severity: Low
CVSS v4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-68461
CWE-ID: CWE-457
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to use of uninitialized memory in fwnode_init() in the firmware node handling code when initializing a fwnode_handle allocated on the stack or with a non-zeroing heap allocation. A local user can trigger dereference of an uninitialized secondary pointer to cause a denial of service.

Exploitation requires control over the lifetime and initialization context of the firmware node object.


Affected software

Linux kernel
Ubuntu
linux (Ubuntu package)
linux-gcp-7.0 (Ubuntu package)
linux-oem-7.0 (Ubuntu package)

How to mitigate CVE-2026-68461

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
linux (Ubuntu package) - addressed in versions 7.0.0-31.31, 7.0.0-31.31.1, 7.0.0-31.31~24.04.1, 7.0.0-1006.7, 7.0.0-1011.11~24.04.1, 7.0.0-1012.12, 7.0.0-1012.12~24.04.1
linux-gcp-7.0 (Ubuntu package) - update to 7.0.0-1011.11~24.04.1
linux-oem-7.0 (Ubuntu package) - update to 7.0.0-1013.13

External References

Related Security Bulletins