Use of Uninitialized Variable in Linux kernel - CVE-2026-46279

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Main Vulnerability Database Vulnerabilities #VU134253

Use of Uninitialized Variable in Linux kernel - CVE-2026-46279

Published: June 10, 2026


Vulnerability identifier: #VU134253
CSH Severity: Low
CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-46279
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 uninitialized codetag references in page allocation tagging when freeing pages that were allocated before page_ext initialization. A local user can trigger kernel memory allocation and free activity to cause a denial of service.

This warning is only observed with CONFIG_MEM_ALLOC_PROFILING_DEBUG enabled and mem_profiling_compressed disabled.


Affected software

Linux kernel
Ubuntu
linux (Ubuntu package)
linux-azure (Ubuntu package)
linux-nvidia (Ubuntu package)
linux-raspi (Ubuntu package)

How to mitigate CVE-2026-46279

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
linux (Ubuntu package) - update to 7.0.0-27.27
linux-azure (Ubuntu package) - addressed in versions 7.0.0-1009.9, 7.0.0-1010.10
linux-nvidia (Ubuntu package) - update to 7.0.0-1013.13
linux-raspi (Ubuntu package) - update to 7.0.0-1014.14

External References

Related Security Bulletins