CVE-2026-49413

High

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.

SeverityHigh

CVSS7.1

Exploit probability—

Product

Freebsd

PublishedJun 27, 2026

First seenJun 27, 2026

Weakness typeCWE-266CWE-266

How to fix

Vendor advisories

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

Affected products

Product	Affected versions	Fixed in
freebsd freebsd	14.3, 14.4, 15.0	—

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