SB20260816289 - Improper access control in Linux kernel netfilter

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Main Vulnerability Database SB20260816289

SB20260816289 - Improper access control in Linux kernel netfilter

Published: August 16, 2026

Security Bulletin ID SB20260816289
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Data manipulation

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Improper access control (CVE-ID: CVE-2026-72247)

CWE-ID: CWE-284 - Improper Access Control

CVSSv4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to bypass connection counting limits.

The vulnerability exists due to improper access control in nf_conncount when processing connection tuples across conntrack zones. A remote attacker can send network traffic that creates connections with matching tuples in different zones to bypass connection counting limits.

The issue affects the tuple dedup logic in __nf_conncount_add(), where original-direction tuples are compared using an incorrect zone direction value.


Remediation

Install update from vendor's website.

References