SB20260727148 - Improper Initialization in Linux kernel bridge netfilter

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Main Vulnerability Database SB20260727148

SB20260727148 - Improper Initialization in Linux kernel bridge netfilter

Published: July 27, 2026

Security Bulletin ID SB20260727148
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Denial of service

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Improper Initialization (CVE-ID: CVE-2026-64413)

CWE-ID: CWE-665 - Improper Initialization

CVSSv4: 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]


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

The vulnerability exists due to improper initialization in the ebtables table translation logic in net/bridge/netfilter/ebtables.c when allocating and freeing the chainstack array. A local user can trigger an allocation failure during table translation to cause a denial of service.

The issue arises when a sparse cpu_possible_mask causes an uninitialized chainstack entry to be freed during cleanup.


Remediation

Install update from vendor's website.

References