SB20260916131 - Use-after-free in Linux kernel kprobe blacklist traversal function __within_kprobe_blacklist()

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Main Vulnerability Database SB20260916131

SB20260916131 - Use-after-free in Linux kernel kprobe blacklist traversal function __within_kprobe_blacklist()

Published: September 16, 2026

Security Bulletin ID SB20260916131
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Code execution

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Use-after-free (CVE-ID: CVE-2026-89988)

CWE-ID: CWE-416 - Use After Free

CVSSv4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a local user to execute arbitrary code, escalate privileges, disclose sensitive information, or cause a denial of service.

The vulnerability exists due to a use-after-free in the kprobe blacklist traversal function __within_kprobe_blacklist() when concurrently checking a kprobe blacklist entry during module unloading. A local user can trigger concurrent blacklist traversal and entry removal to dereference freed memory.

The blacklist traversal can occur in atomic or non-preemptible contexts.


Remediation

Install update from vendor's website.

References