CVE-2026-49431

Incorrect user validation in ZFS_IOC_SET_PROP ioctl

State: Published
Severity: 3.3 Low
Published: Aug 19, 2026
Updated: Aug 26, 2026
Reserved: May 29, 2026

Description

The ZFS_IOC_SET_PROP ioctl, used by zfs-set(8), incorrectly validated the calling user such that an unprivileged user is able to set metadata on a dataset indicating that the dataset has received properties from a zfs-recv(8) stream.

Any local user can set the internal ZFS metadata flag "$hasrecvd" on datasets via ZFS_IOC_SET_PROP.

Scores

CVSS	Score	Vector	Source
3.1	3.3 Low	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N	CISA-ADP

Weaknesses

CWE-863 Incorrect Authorization

Affected Products

Product	Versions
FreeBSDFreeBSD	15.1-RELEASE to before p1Affected 15.0-RELEASE to before p11Affected 14.4-RELEASE to before p7Affected 14.3-RELEASE to before p16Affected

References

https://security.freebsd.org/advisories/FreeBSD-SA-26:40.zfs.ascvendor-advisory

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