CVE-2026-49413 - Vulnerability Details - OpenCVE

The Linuxulator determined whether a binary was set-user-ID or set-group-ID by checking the P_SUGID process flag. During execve(2), this flag is not yet set at the point where the auxiliary vector is constructed, so AT_SECURE was incorrectly set to zero for set-user-ID and set-group-ID executables. An unprivileged local user can inject a shared library via LD_PRELOAD into a set-user-ID or set-group-ID Linux binary, gaining the privileges of that binary.

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact None

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploitation none

Automatable no

Technical Impact total

Vendors	Products
Freebsd	Freebsd

No data.

No data.

References

Link	Providers
https://security.freebsd.org/advisories/FreeBSD-SA-26:30.linux.asc

History

Mon, 29 Jun 2026 13:30:00 +0000

Type	Values Removed	Values Added
Metrics		cvssV3_1 `{'score': 7.1, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H'}` ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}`

Sat, 27 Jun 2026 14:30:00 +0000

Type	Values Removed	Values Added
First Time appeared		Freebsd Freebsd freebsd
Vendors & Products		Freebsd Freebsd freebsd

Sat, 27 Jun 2026 09:15:00 +0000

Type	Values Removed	Values Added
Description		The Linuxulator determined whether a binary was set-user-ID or set-group-ID by checking the P_SUGID process flag. During execve(2), this flag is not yet set at the point where the auxiliary vector is constructed, so AT_SECURE was incorrectly set to zero for set-user-ID and set-group-ID executables. An unprivileged local user can inject a shared library via LD_PRELOAD into a set-user-ID or set-group-ID Linux binary, gaining the privileges of that binary.
Title		Flaw in Linuxulator execution of setugid binaries
Weaknesses		CWE-266
References		https://security.freebsd.org/advisories/FreeBSD-SA-26:30.linux.asc

MITRE

Status: PUBLISHED

Assigner: freebsd

Published: 2026-06-27T09:08:23.756Z

Updated: 2026-06-29T13:05:38.668Z

Reserved: 2026-05-29T20:24:28.615Z

Link: CVE-2026-49413

Vulnrichment

Updated: 2026-06-29T13:05:27.585Z

NVD

No data.

Redhat

No data.

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