SB20260727206 - Improper Initialization in Linux kernel mm

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Main Vulnerability Database SB20260727206

SB20260727206 - Improper Initialization in Linux kernel mm

Published: July 27, 2026

Security Bulletin ID SB20260727206
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Information disclosure

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Improper Initialization (CVE-ID: CVE-2026-64368)

CWE-ID: CWE-665 - Improper Initialization

CVSSv4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]


The vulnerability allows a local user to disclose sensitive information.

The vulnerability exists due to improper initialization in slab allocation handling in mm/slub.c when allocating kmalloc objects with zeroing enabled. A local user can trigger a memory allocation pattern that leaves part of the allocated object uninitialized to disclose sensitive information.

The issue occurs when requested-size tracking is not enabled while red zoning alone is enabled, which can break krealloc() __GFP_ZERO expectations.


Remediation

Install update from vendor's website.

References