CVE-2026-79619
HighCVSS 7.3Exploitation Probability (EPSS)
Low risk4th percentile - higher than 4% of all known CVEs
Summary
On Linux, several OpenZFS ioctl authorization checks accept a capability held only within an unprivileged user 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 (e.g., create, import, destroy), pool event log access (zpool events), and fault injection (zinject). Exploitation requires only that the local user can open /dev/zfs and that the kernel permits unprivileged user namespace creation.
Risk Assessment
An unprivileged local user can take over ZFS pools, potentially leading to data loss, system integrity compromise, or privilege escalation.
Recommendation
Update OpenZFS to a patched version and consider restricting access to /dev/zfs and disabling unprivileged user namespaces if not needed.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

