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.
Published: 2026-08-19
Score: 7.8 High
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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History

Wed, 26 Aug 2026 18:30:00 +0000

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 7.8, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Wed, 19 Aug 2026 11:45:00 +0000

Type Values Removed Values Added
First Time appeared Freebsd
Freebsd freebsd
Vendors & Products Freebsd
Freebsd freebsd

Wed, 19 Aug 2026 05:30:00 +0000

Type Values Removed Values Added
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.
Title Kernel heap overflow in ZFS_IOC_RECV_NEW ioctl
Weaknesses CWE-122
References

cve-icon MITRE

Status: PUBLISHED

Assigner: freebsd

Published:

Updated: 2026-08-26T17:41:36.355Z

Reserved: 2026-05-29T20:24:28.616Z

Link: CVE-2026-49430

cve-icon Vulnrichment

Updated: 2026-08-26T17:41:30.954Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-08-19T06:17:42.767

Modified: 2026-08-26T18:16:37.567

Link: CVE-2026-49430

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-26T20:15:03Z

Weaknesses