CVE-2026-49414

ASLR bypass for setuid executables via procctl(2)

State: Published
Severity: 7.8 High
Published: Jun 27, 2026
Updated: Jun 29, 2026
Reserved: May 29, 2026

Description

The ELF image activator cleared per-process ASLR preference flags for setuid binaries after the code that computes the PIE base address, rather than before. As a result, a user-requested ASLR disable was still in effect at the point where the base address was chosen.

An unprivileged local user can disable ASLR for a setuid PIE binary by calling procctl(2) before execve(2). This makes exploitation of any separate memory corruption vulnerability in that binary significantly easier.

Scores

CVSS	Score	Vector	Source
3.1	7.8 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	CISA-ADP

Weaknesses

CWE-179 Incorrect Behavior Order: Early Validation

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-26:32.elf.ascvendor-advisory

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