SB2026110316 - Use-after-free in Linux kernel trace

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Main Vulnerability Database SB2026110316

SB2026110316 - Use-after-free in Linux kernel trace

Published: November 3, 2026

Security Bulletin ID SB2026110316
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-2026-99233)

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 potentially execute arbitrary code in kernel context, disclose sensitive information, or cause a denial of service.

The vulnerability exists due to a use-after-free caused by incorrect synthetic-event reference counting in the Linux kernel tracing histogram subsystem when registering or unregistering histograms on non-synthetic events with basenames matching synthetic events. A local user can register a histogram on a non-synthetic event before creating a same-named synthetic event and remove the histogram afterwards to prematurely free the synthetic event while an active histogram action retains a pointer to it, potentially enabling arbitrary kernel code execution, sensitive information disclosure, or a kernel crash.


Remediation

Install update from vendor's website.

References