SB20261103131 - Infinite loop in Linux kernel zap_pid_ns_processes() in kernel/pid_namespace.c and do_wait() in kernel/exit.c

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Main Vulnerability Database SB20261103131

SB20261103131 - Infinite loop in Linux kernel zap_pid_ns_processes() in kernel/pid_namespace.c and do_wait() in kernel/exit.c

Published: November 3, 2026

Security Bulletin ID SB20261103131
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-2026-99249)

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

CVSSv4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]


The vulnerability allows a local user to cause a denial of service by preventing system suspend and causing excessive CPU consumption.

The vulnerability exists due to non-freezable, potentially unbounded wait loops in zap_pid_ns_processes() when a PID namespace's init process exits while a tracer outside the namespace retains unreaped traced zombies. A local user can leave traced zombies unreaped to keep namespace teardown waiting indefinitely, prevent system suspend, and cause the final wait loop to spin after a freeze attempt.


Remediation

Install update from vendor's website.

References