SB2026081623 - Improper input validation in Linux kernel netfilter

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Main Vulnerability Database SB2026081623

SB2026081623 - Improper input validation in Linux kernel netfilter

Published: August 16, 2026

Security Bulletin ID SB2026081623
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 input validation (CVE-ID: CVE-2026-72347)

CWE-ID: CWE-20 - Improper input validation

CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/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 input validation in the xt_connmark CONNMARK target revision 2 handling when evaluating a rule with invalid shift parameters. A local user can install a malformed rule with a shift_bits value of 32 or more or an invalid shift_dir value to cause a denial of service.

The issue is triggered when the malformed rule is evaluated in the packet path.


Remediation

Install update from vendor's website.

References