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CVE-2026-49413

HighPublished

Flaw in Linuxulator execution of setugid binaries

Published: Jun 27, 2026
Updated: Jun 29, 2026
Assigning CNA: freebsd
Evidence observed: Aug 8, 2026

Primary CVSS

7.1/ 10High

nvd · CVSS 3.1

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

EPSS probability estimate

0.1%

Low · next 30 days

Percentile: 2.6%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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.

Sources

CVE-2026-49413Exploit
FreeBSD LPE

Responsible use

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