SB20261022233 - Improper locking in Linux kernel ipv4

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Main Vulnerability Database SB20261022233

SB20261022233 - Improper locking in Linux kernel ipv4

Published: October 22, 2026

Security Bulletin ID SB20261022233
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Partial DoS

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Improper locking (CVE-ID: CVE-2026-98646)

CWE-ID: CWE-667 - Improper Locking

CVSSv4: 4.6 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]


The vulnerability allows a local privileged user to trigger kernel warnings and potentially disrupt system stability.

The vulnerability exists due to improper locking in inet_csk_listen_stop() when stopping a TCP listener with children in its accept queue from a BPF TCP iterator. A local privileged user can invoke bpf_sock_destroy() through the iterator to reach cond_resched() while an RCU read-side lock is held, triggering an invalid-context warning and potentially disrupting system stability.


Remediation

Install update from vendor's website.

References