SB20260507110 - Out-of-bounds read in Linux kernel netfilter

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Main Vulnerability Database SB20260507110

SB20260507110 - Out-of-bounds read in Linux kernel netfilter

Published: May 7, 2026

Security Bulletin ID SB20260507110
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Information disclosure

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Out-of-bounds read (CVE-ID: CVE-2026-43233)

CWE-ID: CWE-125 - Out-of-bounds read

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green


The vulnerability allows a remote attacker to disclose sensitive information.

The vulnerability exists due to an out-of-bounds read in decode_choice() in nf_conntrack_h323 when processing a crafted Q.931 SETUP message containing a User-User Information Element with PER-encoded data. A remote attacker can send a specially crafted network message to disclose sensitive information.

Exploitation requires the nf_conntrack_h323 helper to be active and can be triggered via port 1720.


Remediation

Install update from vendor's website.

References