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.

The remote Ubuntu 22.04 LTS / 24.04 LTS / 26.04 LTS host has packages installed that are affected by a vulnerability as referenced in the USN-8705-1 advisory.

    It was discovered that OpenZFS incorrectly handled authorization checks for certain ioctl operations on     Linux. A local attacker could possibly use this issue to perform pool-administrative operations or access     privileged information, resulting in an authorization bypass.

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - 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. (CVE-2026-79619)

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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. (CVE-2026-79619)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Type	Severity
365433	Ubuntu 22.04 LTS / 24.04 LTS / 26.04 LTS : OpenZFS vulnerability (USN-8705-1)	Nessus	Ubuntu Local Security Checks	Local	high
458309	Echo: zfs-linux: security update to 2.3.2-2+e1	Tenable Cloud Security	Echo Local Security Checks	Local	high
458309	Echo: zfs-linux: security update to 2.3.2-2+e1	Tenable Self-Hosted Container Security	Echo Local Security Checks	Local	high
340809	Linux Distros Unpatched Vulnerability : CVE-2026-79619	Nessus	Misc.	Local	high

Detections

Analytics

CVE-2026-79619

high

Tenable Plugins

high

high

high

high