Input validation error in FreeBSD - CVE-2026-49428
Published: July 1, 2026
Vulnerability identifier: #VU136015
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-49428
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 largepage shared memory object operations when invoking unsupported system calls such as open(2) with the O_TRUNC flag set or fspacectl(2). A local user can invoke unsupported operations on a largepage object to escalate privileges.
These operations are not permitted on largepage objects, but the implementation did not verify this.
How to mitigate CVE-2026-49428
Install security update from vendor's website.