SB2026090122 - Incorrect authorization in zfs

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Main Vulnerability Database SB2026090122

SB2026090122 - Incorrect authorization in zfs

Published: September 1, 2026

Security Bulletin ID SB2026090122
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Code execution

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Incorrect authorization (CVE-ID: CVE-2026-79619)

CWE-ID: CWE-863 - Incorrect Authorization

CVSSv4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a local user to bypass authorization checks and perform administrative OpenZFS operations.

The vulnerability exists due to incorrect authorization in several OpenZFS ioctl authorization checks when evaluating CAP_SYS_ADMIN within a user-created namespace. A local user can create an unprivileged user namespace and invoke affected ioctls to bypass authorization checks and perform administrative OpenZFS operations.

Exploitation requires that the user can open /dev/zfs and that the kernel permits unprivileged user namespace creation. No prior access to the target pool or its underlying devices is required.


Remediation

Install update from vendor's website.

References