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CVE-2026-79619 Affecting zfs-linux package, versions <0.7.5-1ubuntu16.12+esm1

Severity

 Recommended
high

Based on Ubuntu security rating.

Threat Intelligence

EPSS
0.14% (4th percentile)

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  • Snyk IDSNYK-UBUNTU1804-ZFSLINUX-19384727
  • published28 Aug 2026
  • disclosed26 Aug 2026
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Introduced: 26 Aug 2026

NewCVE-2026-79619  (opens in a new tab)

How to fix?

Upgrade Ubuntu:18.04 zfs-linux to version 0.7.5-1ubuntu16.12+esm1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream zfs-linux package and not the zfs-linux package as distributed by Ubuntu. See How to fix? for Ubuntu:18.04 relevant fixed versions and status.

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.