Description
The ZFS_IOC_RECV_NEW ioctl, in the heal receive path, similarly truncated a 64-bit payload size to a 32-bit integer for allocation, then used the original 64-bit size as the length for a byteswap operation.
A local user with the "receive" delegated ZFS permission can trigger kernel memory corruption via ZFS_IOC_RECV_NEW by sending a crafted receive stream in heal mode.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| FreeBSD | FreeBSD | 15.1-RELEASE – < p1, 15.0-RELEASE – < p11, 14.4-RELEASE – < p7, 14.3-RELEASE – < p16 | p1 |
Advisories 1
- WID-SEC-2026-2165 FreeBSD Project FreeBSD OS: Mehrere Schwachstellen BSI CERT-Bund (WID) · Aug 19, 2026
References
- https://security.freebsd.org/advisories/FreeBSD-SA-26:40.zfs.asc vendor-advisory