CVE-2026-49413

Flaw in Linuxulator execution of setugid binaries

State: Published
Severity: 7.1 High
Published: Jun 27, 2026
Updated: Jun 29, 2026
Reserved: May 29, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	7.1 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H	CISA-ADP

Weaknesses

CWE-266 Incorrect Privilege Assignment

Affected Products

Product	Versions
FreeBSDFreeBSD	15.0-RELEASE to before p10Affected 14.4-RELEASE to before p6Affected 14.3-RELEASE to before p15Affected

References

https://security.freebsd.org/advisories/FreeBSD-SA-26:30.linux.ascvendor-advisory

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