SB20261103137 - Infinite loop in Linux kernel kernel/pid_namespace.c: zap_pid_ns_processes()

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Main Vulnerability Database SB20261103137

SB20261103137 - Infinite loop in Linux kernel kernel/pid_namespace.c: zap_pid_ns_processes()

Published: November 3, 2026

Security Bulletin ID SB20261103137
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) Infinite loop (CVE-ID: CVE-2026-99244)

CWE-ID: CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')

CVSSv4: 2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]


The vulnerability allows a local user to potentially cause a denial of service through excessive CPU consumption.

The vulnerability exists due to improper handling of notification signals in zap_pid_ns_processes() when waiting for processes in a PID namespace to exit. A local user can potentially trigger PID namespace teardown under conditions where TIF_NOTIFY_SIGNAL is repeatedly raised to cause the namespace reaper to busy-wait instead of sleeping, consuming CPU resources.


Remediation

Install update from vendor's website.

References