CVE-2026-49413 — Flaw in Linuxulator execution of setugid binaries

Description (CNA)

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.

Affected (CNA)

Vendor / product	Versions
FreeBSD / FreeBSD	affected 15.0-RELEASE before p10; affected 14.4-RELEASE before p6; affected 14.3-RELEASE before p15

CWE

CWE-266

References

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

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.