SB2026050882 - Memory leak in Linux kernel netfilter

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Main Vulnerability Database SB2026050882

SB2026050882 - Memory leak in Linux kernel netfilter

Published: May 8, 2026

Security Bulletin ID SB2026050882
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Denial of service

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Memory leak (CVE-ID: CVE-2026-43451)

CWE-ID: CWE-401 - Missing release of memory after effective lifetime

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green


The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to a memory leak in nfqnl_recv_verdict() in nfnetlink_queue when parsing bridge VLAN attributes for PF_BRIDGE packets. A remote attacker can send a specially crafted netfilter queue verdict message to cause a denial of service.

Repeated triggering can exhaust kernel memory by leaking an nf_queue_entry, its associated sk_buff, and related references.


Remediation

Install update from vendor's website.

References