SB2026052866 - Improper locking in Linux kernel ipv4

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Main Vulnerability Database SB2026052866

SB2026052866 - Improper locking in Linux kernel ipv4

Published: May 28, 2026

Security Bulletin ID SB2026052866
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 locking (CVE-ID: CVE-2026-46015)

CWE-ID: CWE-667 - Improper Locking

CVSSv4: 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/E:U/U:Clear


The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to improper notification handling in inet_csk_listen_stop() when migrating an established child socket between listeners in the same SO_REUSEPORT group. A local user can trigger listener migration to cause poll()/epoll_wait() waiters and blocking accept() callers to remain asleep indefinitely.

Nonblocking accept() is not affected because it checks the accept queue directly.


Remediation

Install update from vendor's website.

References