CVE-2026-49430
Kernel heap overflow in ZFS_IOC_RECV_NEW ioctl
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-122 |
| Vendor | freebsd |
| Product | freebsd |
| Published | Aug 19, 2026 |
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Affected Versions
FreeBSD / FreeBSD
15.1-RELEASE < p1 15.0-RELEASE < p11 14.4-RELEASE < p7 14.3-RELEASE < p16
References
Credits
Yuxiang Yang, Yizhou Zhao, Ao Wang, Xuewei Feng, Qi Li, and Ke Xu from Tsinghua University using GLM-5.1 from Z.ai Emmanuel Genier at Quarkslab