What’s Vulnerable › Vulnerabilities
CVE-2026-49430: Kernel heap overflow in ZFS_IOC_RECV_NEW ioctl
- Severity: high (CVSS 7.8 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.2% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-08-19 · updated 2026-09-01
- Weakness: CWE-122
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
- FreeBSD: 14.3, 14.3-p1, 14.3-p10, 14.3-p11, 14.3-p12, 14.3-p13 (+32)
References
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