CVE-2026-49413Public exploit

Local privilege escalation via incorrect AT_SECURE flag

Published Jun 27, 2026 · Updated Jun 27, 2026

Privilege escalation in FreeBSD allows local users to gain a set-ID Linux binary's privileges through the Linuxulator. The copyout_auxargs path checks P_SUGID before execve sets it, causing the Linuxulator to emit AT_SECURE as zero for a set-user-ID or set-group-ID binary. An unprivileged local account can consequently use LD_PRELOAD to inject a shared library that executes with the binary's elevated identity.

CVSS severity7.1
High
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Privilege escalation in FreeBSD allows local users to gain a set-ID Linux binary's privileges through the Linuxulator. The copyout_auxargs path checks P_SUGID before execve sets it, causing the Linuxulator to emit AT_SECURE as zero for a set-user-ID or set-group-ID binary. An unprivileged local account can consequently use LD_PRELOAD to inject a shared library that executes with the binary's elevated identity.

The record

CVE
CVE-2026-49413
Published
Jun 27, 2026
Updated
Jun 27, 2026
Vendor
The FreeBSD Project
Product
FreeBSD
Classifications
CWE-266, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 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=14.3-RELEASE <p15
  2. Affected versionversion=14.4-RELEASE <p6
  3. Affected versionversion=15.0-RELEASE <p10

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The FreeBSD Project · FreeBSDversion=14.3-RELEASE <p15; version=14.4-RELEASE <p6; version=15.0-RELEASE <p10

Published CVSS scores

7.1CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-266Incorrect Privilege Assignment
T1068Exploitation for Privilege Escalation

Public exploit references

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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