CVE-2026-49413

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.

PUBLISHED Reserved 2026-05-29 | Published 2026-06-27 | Updated 2026-06-27 | Assigner freebsd

Problem types

CWE-266: Incorrect Privilege Assignment

Product status

Credits

Minseong Kim of NSHC Red Alert Labs finder

References

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

cve.org (CVE-2026-49413)

nvd.nist.gov (CVE-2026-49413)

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