CVE-2026-49430

High

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.

SeverityHigh

CVSS7.8

Exploit probability—

Product

Freebsd

PublishedAug 19, 2026

First seenAug 19, 2026

Weakness typeCWE-122CWE-122

How to fix

Vendor advisories

security.freebsd.org/advisories/FreeBSD-SA-26:40.zfs.asc

Affected products

Product	Affected versions	Fixed in
freebsd freebsd	14.3, 14.4, 15.0, 15.1	—

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