CVE-2026-58092

Local privilege escalation via incorrect primary group selection

Published Aug 26, 2026 · Updated Aug 27, 2026

Credential-switching flaw in FreeBSD 15.0-RELEASE before p13 and 15.1-RELEASE before p3 allows local users to gain unintended group privileges. group_is_primary() reads the first supplementary-group array element instead of the dedicated primary-group field when a rule omits a target group. With a matching administrator-defined rule, an empty supplementary-group list yields wheel membership; root access additionally requires a configured group-0 transition.

CVSS severity5.4
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Credential-switching flaw in FreeBSD 15.0-RELEASE before p13 and 15.1-RELEASE before p3 allows local users to gain unintended group privileges. group_is_primary() reads the first supplementary-group array element instead of the dedicated primary-group field when a rule omits a target group. With a matching administrator-defined rule, an empty supplementary-group list yields wheel membership; root access additionally requires a configured group-0 transition.

The record

CVE
CVE-2026-58092
Published
Aug 26, 2026
Updated
Aug 27, 2026
Vendor
The FreeBSD Project
Product
FreeBSD
Classifications
CWE-288, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 26, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 27, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=15.0-RELEASE <p13
  2. Affected versionversion=15.1-RELEASE <p3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The FreeBSD Project · FreeBSDversion=15.0-RELEASE <p13; version=15.1-RELEASE <p3

Published CVSS scores

5.4FreeBSDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-288Authentication Bypass Using an Alternate Path or Channel
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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