SB20261023124 - Uncontrolled Recursion in Linux kernel bridge

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Main Vulnerability Database SB20261023124

SB20261023124 - Uncontrolled Recursion in Linux kernel bridge

Published: October 23, 2026

Security Bulletin ID SB20261023124
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) Uncontrolled Recursion (CVE-ID: CVE-2026-99031)

CWE-ID: CWE-674 - Uncontrolled Recursion

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 through kernel stack exhaustion.

The vulnerability exists due to uncontrolled recursion in br_multicast_sg_del_exclude_ports() in the Linux kernel bridge multicast subsystem when removing automatically added STAR_EXCL port groups from source-specific multicast entries. A local user can trigger cleanup of an entry containing a large number of these port groups to exhaust the kernel stack and potentially crash the system.


Remediation

Install update from vendor's website.

References