SB20260824198 - Improper locking in Linux kernel netfilter

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Main Vulnerability Database SB20260824198

SB20260824198 - Improper locking in Linux kernel netfilter

Published: August 24, 2026

Security Bulletin ID SB20260824198
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) Improper locking (CVE-ID: CVE-2026-74624)

CWE-ID: CWE-667 - Improper Locking

CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


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

The vulnerability exists due to improper lock handling in netfilter nf_conntrack TCP and SCTP invalid-packet logging when processing invalid packets while invalid logging is routed to nfnetlink_log and conntrack export is enabled. A remote attacker can send specially crafted packets to cause a denial of service.

The issue can deadlock when invalid-packet logging re-enters conntrack netlink glue and attempts to dump the same connection tracking entry again.


Remediation

Install update from vendor's website.

References