SB20261022406 - Improper input validation in Linux kernel netfilter

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Main Vulnerability Database SB20261022406

SB20261022406 - Improper input validation in Linux kernel netfilter

Published: October 22, 2026

Security Bulletin ID SB20261022406
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-2026-98793)

CWE-ID: CWE-20 - Improper input validation

CVSSv4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a local privileged user to cause a denial of service by triggering a kernel crash.

The vulnerability exists due to improper input validation in the Linux kernel netfilter function bpf_ct_set_nat_info() when handling NAT manipulation types. A local privileged user can supply an invalid NAT manipulation type through this function to trigger a kernel warning and potentially cause a kernel crash. If execution continues after the warning, inconsistent connection tracking state causes cleanup to attempt to unlink an uninitialized list node.


Remediation

Install update from vendor's website.

References