SB2026061090 - Use of Uninitialized Variable in Linux kernel mm

Description

This security bulletin contains information about 1 vulnerability.

1) Use of Uninitialized Variable (CVE-ID: CVE-2026-46279)

CWE-ID: CWE-457 - Use of Uninitialized Variable

CVSSv4: 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/E:U/U:Clear

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.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/6b1842775a460245e97d36d3a67d0cfba7c4ff79
• https://git.kernel.org/stable/c/b49dfabc38cad5e50af24f63edd124a10de3ebb6
• https://git.kernel.org/stable/c/d5b495ba9de0423ef39f8bd86729a885870c7efe