Improper access control in FreeBSD - CVE-2026-49431
Published: July 1, 2026
Vulnerability identifier: #VU136010
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-49431
CWE-ID: CWE-284
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 attacker to modify internal ZFS metadata.
The vulnerability exists due to improper access control in the ZFS_IOC_SET_PROP ioctl when validating the calling user for dataset property updates. A local attacker can set the "$hasrecvd" dataset metadata flag to modify internal ZFS metadata.
How to mitigate CVE-2026-49431
Install security update from vendor's website.