Buffer Overflow Vulnerability in FreeBSD's Kernel Privilege Management
CVE-2026-45250

7.8HIGH

Key Information:

Vendor

FreeBSD

Status
FreeBSD
Vendor
CVE Published:
21 May 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-45250?

A vulnerability exists in FreeBSD's setcred(2) system call, where an unprivileged local user can exploit a stack buffer overflow due to improper length validation of a user-supplied supplementary groups list. This oversight allows for an arbitrary code execution in the kernel context, potentially granting elevated privileges to unauthorized users. Proper input validation measures are critical to mitigating such risks and protecting system integrity.

Affected Version(s)

FreeBSD 15.0-RELEASE

FreeBSD 14.4-RELEASE

FreeBSD 14.3-RELEASE

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

setcred
Created by venglin

References

https://security.freebsd.org/advisories/FreeBSD-SA-26:18....
vendor-advisory

CVSS V3.1

Score:
7.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Ryan of Calif.io
Przemyslaw Frasunek
.