USN-8705-1: OpenZFS vulnerability

unknownCVE-2026-79619

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.

CSIRTS triage

vendor: OpenZFS product: OpenZFS Authentication bypass Privilege escalation

What: OpenZFS incorrectly handles authorization checks for certain ioctl operations on Linux, allowing unauthorized pool-administrative operations.
Who is affected: Local users on systems running OpenZFS on Linux.
Urgency: High urgency; local privilege escalation via authorization bypass affecting active deployments.
Action: Apply the security update from USN-8705-1 to patch CVE-2026-79619.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: Ubuntu Security Notices (INTL · vendor-psirt · site)
Severity: unknown
Published: 2026-08-31
Exploitation: Not in CISA KEV at last sync

Original advisory: https://ubuntu.com/security/notices/USN-8705-1

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-796190.14% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 4% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-79619	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.