CVE-2026-79619 (High) detected in zfszfs-2.1.15

[mend-bolt-for-github]

CVE-2026-79619 - High Severity Vulnerability

Vulnerable Library - zfszfs-2.1.15

OpenZFS on Linux and FreeBSD

Library home page: https://github.com/openzfs/zfs.git

Found in base branch: stable/4.0

Vulnerable Source Files (1)

/sys/contrib/openzfs/module/os/linux/zfs/policy.c

Vulnerability Details

On Linux, several OpenZFS ioctl authorization checks accept a capability held only within a user-created, unprivileged namespace as equivalent to real host privilege, allowing an unprivileged local user to perform operations that should require root. Affected operations include pool-administrative operations (eg create, import, destroy), pool event log access (zpool events) and fault injection (zinject). Exploiting the problem requires only that the local user is permitted to open /dev/zfs (governed by local device permissions) and that the kernel permits unprivileged user namespace creation. No prior access to the target pool or its underlying devices is needed.

Publish Date: 2026-08-26

URL: CVE-2026-79619

CVSS 3 Score Details (7.8)

Base Score Metrics:

• Exploitability Metrics:
  • Attack Vector: Local
  • Attack Complexity: Low
  • Privileges Required: Low
  • User Interaction: None
  • Scope: Unchanged
• Impact Metrics:
  • Confidentiality Impact: High
  • Integrity Impact: High
  • Availability Impact: High

For more information on CVSS3 Scores, click here.

Suggested Fix

Type: Upgrade version

Release Date: 2026-08-26

Fix Resolution: https://github.com/openzfs/zfs.git - zfs-2.3.9,https://github.com/openzfs/zfs.git - zfs-2.4.4,https://github.com/openzfs/zfs.git - zfs-2.2.11

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