CVE-2026-49430CWE-122

CVE-2026-49430

High · published August 19, 2026

CVSS v3.1
7.8
EPSS
0%
Percentile
4.1
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.8 · HIGH
Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00153 · 4.1th percentile
Weakness
CWE-122 · Heap-based Buffer Overflow
Published
2026-08-19T10:17Z
Affected products (38)
ProductVersionsFixed in
freebsd/freebsdall versions—
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References (1)
https://security.freebsd.org/advisories/FreeBSD-SA-26:40.zfs.asc · [email protected]
EPSS history
Timeline
  • 19 AUG 05:15Z
    Kernel heap overflow in ZFS_IOC_RECV_NEW ioctl
    cvelistv5