Low severity · published Aug 19, 2026
CVE-2026-49431
Incorrect user validation in ZFS_IOC_SET_PROP ioctl
3.3
CVSS
0.1%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.1% · higher than 2% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FR
FreeBSD · FreeBSD
15.1-RELEASE before p1; 15.0-RELEASE before p11; 14.4-RELEASE before p7; 14.3-RELEASE before p16 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-49431
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-49431
Vendor Advisory
https://security.freebsd.org/advisories/FreeBSD-SA-26:40.zfs.asc
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