SB20261023103 - NULL pointer dereference in Linux kernel is_chained_work() in kernel/workqueue.c

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Main Vulnerability Database SB20261023103

SB20261023103 - NULL pointer dereference in Linux kernel is_chained_work() in kernel/workqueue.c

Published: October 23, 2026

Security Bulletin ID SB20261023103
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) NULL pointer dereference (CVE-ID: CVE-2026-99058)

CWE-ID: CWE-476 - NULL Pointer Dereference

CVSSv4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a local user to potentially cause a denial of service by triggering a kernel fault.

The vulnerability exists due to a NULL pointer dereference in is_chained_work() in kernel/workqueue.c when a kernel worker outside work-item execution queues work on a draining or destroying workqueue. A local user can potentially trigger this condition to cause the chained-work check to dereference a NULL worker->current_pwq pointer and fault.


Remediation

Install update from vendor's website.

References