SB2026040672 - Integer overflow in Linux kernel netfilter

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Main Vulnerability Database SB2026040672

SB2026040672 - Integer overflow in Linux kernel netfilter

Published: April 6, 2026

Security Bulletin ID SB2026040672
Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Denial of service

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 security vulnerability.


1) Integer overflow (CVE-ID: CVE-2026-23457)

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to integer truncation in nf_conntrack_sip when parsing the SIP Content-Length header in sip_help_tcp() over TCP. A remote attacker can send a specially crafted SIP message with an oversized Content-Length value to cause a denial of service.

On 64-bit systems, a Content-Length value exceeding UINT_MAX can be truncated before the SIP message boundary is computed, causing trailing TCP segment data to be treated as a second SIP message and processed through the SDP parser.


Remediation

Install update from vendor's website.

References