SB20260424218 - Improper access control in Linux kernel ipv4

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Main Vulnerability Database SB20260424218

SB20260424218 - Improper access control in Linux kernel ipv4

Published: April 24, 2026

Security Bulletin ID SB20260424218
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 access control (CVE-ID: CVE-2026-31503)

CWE-ID: CWE-284 - Improper Access Control

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 access control in the UDP socket bind conflict check when binding a wildcard address after multiple sockets are already bound to the same local port. A local user can bind sockets to multiple specific local addresses on the same port and then bind a wildcard address to bypass conflict detection and cause a denial of service.

The issue affects IPv6 wildcard, IPv4 wildcard, and IPv4-mapped wildcard addresses when the bind bucket count exceeds 10.


Remediation

Install update from vendor's website.

References