SB2026072045 - Improper locking in Linux kernel phonet

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Main Vulnerability Database SB2026072045

SB2026072045 - Improper locking in Linux kernel phonet

Published: July 20, 2026

Security Bulletin ID SB2026072045
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-2026-64177)

CWE-ID: CWE-667 - Improper Locking

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 locking in pep_do_rcv() in net/phonet/pep.c when forwarding an skb to a child socket via sk_receive_skb(). A local user can trigger socket backlog processing that acquires the child socket lock with bottom halves enabled to cause a denial of service.

The issue can lead to an inconsistent lock state and a self-deadlock on the same CPU when packets are received for the same child socket.


Remediation

Install update from vendor's website.

References