SB20261022477 - Always-Incorrect Control Flow Implementation in Linux kernel get_optimized_kprobe() in kernel/kprobes.c

CSH
CYBERSECURITY HELP
Sign In REGISTER

Main Vulnerability Database SB20261022477

SB20261022477 - Always-Incorrect Control Flow Implementation in Linux kernel get_optimized_kprobe() in kernel/kprobes.c

Published: October 22, 2026

Security Bulletin ID SB20261022477
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) Always-Incorrect Control Flow Implementation (CVE-ID: CVE-2026-98856)

CWE-ID: CWE-670 - Always-Incorrect Control Flow Implementation

CVSSv4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a local privileged user to disrupt kernel execution and potentially cause a denial of service.

The vulnerability exists due to premature termination of overlap checks in get_optimized_kprobe() in kernel/kprobes.c when arming overlapping probes on x86. A local privileged user can arrange overlapping probes with an intervening disabled probe so that a new probe's INT3 instruction overwrites part of an active optimized probe's jump displacement, redirecting kernel execution to an incorrect address and potentially causing a denial of service.


Remediation

Install update from vendor's website.

References