Freebsd EUVD-2026-101856

| CVE-2026-58099

Race Condition (CWE-362)

2026-10-15 freebsd

GHSA-f53j-rp59-76p7

Privilege Escalation Race Condition Freebsd

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Vulnerability Assessment

Weakness

CWE

CWE-362

OWASP Top 10:2025

A06:2025 - Insecure Design

ASVS 5.0

V15 - Secure Coding and Architecture Concurrency control, locking

MITRE ATT&CK

1 technique across 1 tactic: Privilege Escalation

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

Monitor Track and reassess. Why: No CVSS yet + weak signal (CWE or non-zero EPSS).

No patch listed yet 0.1% exploitation probability (EPSS)

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AnalysisCVE.org

When copying knotes from a parent kqueue to a child, the copy code did not correctly exclude marker knotes (used internally to track list traversal position) before marking them as in-flux and releasing the kqueue lock. If another thread freed a marker while the lock was dropped, the subsequent in-flux decrement operated on freed memory.

An unprivileged local user may be able to exploit these races to escalate privileges.

Affected VersionsENISA

FreeBSD 15.1-RELEASE <p4

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

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Check this CVE against your own stack and servers
Exploit and PoC references, threat intelligence from 22 sources

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Threat Intelligence Overview

EPSS Score

0.1%

Top 97% exploitable

Data Quality

3 sources

Confidence: Low

EUVD

CVE.org

EPSS

Vulnrichment

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity Not scored yet

CISA KEV No

Public POC No

EPSS 0.1%

Patch available No

Active threat No

Deciding rule

No CVSS yet + weak signal (CWE or non-zero EPSS)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

Attack Technique

Privilege Escalation HIGH

Privilege escalation occurs when an attacker leverages flaws in access control mechanisms to gain permissions beyond what they were originally granted.

Race Condition MEDIUM

Race conditions occur when multiple concurrent requests exploit the brief time gap between checking a condition and acting upon it (TOCTOU - Time of Check, Time of Use).