Input validation error in FreeBSD - CVE-2026-45253
Published: May 21, 2026
Vulnerability identifier: #VU132009
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-45253
CWE-ID: CWE-20
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: FreeBSD Foundation
Affected software:
FreeBSD
FreeBSD
Detailed vulnerability description
The vulnerability allows a local user to escalate privileges.
The vulnerability exists due to improper input validation in ptrace(PT_SC_REMOTE) when handling syscall(2) and __syscall(2) meta-system calls. A local user can supply crafted parameters to trigger arbitrary code execution in the kernel to escalate privileges.
Exploitation requires the ability to debug a process.
How to mitigate CVE-2026-45253
Install security update from vendor's website.