SB20260919149 - NULL pointer dereference in Linux kernel ftrace

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Main Vulnerability Database SB20260919149

SB20260919149 - NULL pointer dereference in Linux kernel ftrace

Published: September 19, 2026

Security Bulletin ID SB20260919149
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) NULL pointer dereference (CVE-ID: CVE-2026-90066)

CWE-ID: CWE-476 - NULL Pointer Dereference

CVSSv4: 1.8 [CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]


The vulnerability allows a local privileged user to cause a denial of service.

The vulnerability exists due to improper validation of an error pointer in ftrace_direct_multi_init() and ftrace_direct_multi_exit() in samples/ftrace/ftrace-direct-multi-modify.c when unloading the ftrace-direct-multi-modify module after kthread_run() fails. A local privileged user can cause kthread_stop() to receive an error pointer to cause a denial of service.


Remediation

Install update from vendor's website.

References