VulnerabilityAnalyzed

CVE-2026-49430

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.

HIGH 7.8EPSS 0.16%

Does this matter?

High impact if exploited, but EPSS currently rates exploitation as unlikely (0.16%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.

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.

CVSS 3.1: 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS: 0.16% probability · 6th percentile
CISA KEV: Not listed
Weakness: CWE-122
Affected: freebsd/freebsd
Source: secteam@freebsd.org

References

https://security.freebsd.org/advisories/FreeBSD-SA-26:40.zfs.ascVendor Advisory

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.