SB20260626220 - Improper access control in Linux kernel netfilter

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Main Vulnerability Database SB20260626220

SB20260626220 - Improper access control in Linux kernel netfilter

Published: June 26, 2026

Security Bulletin ID SB20260626220
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-2026-52920)

CWE-ID: CWE-284 - Improper Access Control

CVSSv4: 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/E:U/U:Green


The vulnerability allows a remote attacker to bypass inbound IPsec policy matching restrictions.

The vulnerability exists due to improper access control in the xt_policy netfilter matcher when processing strict mode inbound policy matching. A remote attacker can send network traffic that traverses a multi-element inbound rule to bypass inbound IPsec policy matching restrictions.

The issue affects strict matching of multi-element inbound rules.


Remediation

Install update from vendor's website.

References