---
id: "CVE-2026-91348"
kind: "vulnerability"
aliases: ["CVE-2026-91348"]
title: "Oracle Solaris Utility flaw lets a local user take over the system"
severity: "high"
cvss: 8.4
epss: 0.00129
exploited: false
status: "open"
category: "infrastructure"
products: []
ecosystems: []
tags: ["infrastructure", "on-prem", "oracle-solaris", "shared-hosts", "solaris"]
not_affected_if: ["no-untrusted-local-logons", "other-os"]
published_at: "2026-10-20T22:20:37+00:00"
first_seen_at: "2026-10-23T21:57:26+00:00"
updated_at: "2026-10-25T12:38:52+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-91348", "first_seen_at": "2026-10-23T21:57:26+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-91348", "first_seen_at": "2026-10-25T12:38:52+00:00"}]
---

# Oracle Solaris Utility flaw lets a local user take over the system

A flaw in the Utility component of Oracle Solaris 11.3 and 11.4 lets an attacker who already has a logon on the machine compromise the operating system. Per the CVSS vector, no user interaction or privileges are needed beyond local access, and a successful attack gives full takeover.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Run `uname -v` or `pkg info entire` to see the Solaris release, and compare it with the fixed level in Oracle's advisory.
- Check whether the system is running Solaris 11.3 or 11.4 at all; releases outside those lines are not listed as affected.

## Fix

- Apply the Oracle Critical Patch Update fix for Solaris 11.3 and 11.4 (`pkg update` on a system with the Oracle support repository configured), then reboot.
- Exact fixed package versions: unknown; the sources do not list them.

## Timeline

- 2026-10-23T21:57:26+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-91348
- 2026-10-25T12:38:52+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2026-91348

## From the sources

Vulnerability in the Oracle Solaris product of Oracle Systems (component: Utility).  Supported versions that are affected are 11.3 and  11.4. Easily exploitable vulnerability allows unauthenticated attacker with logon to the infrastructure where Oracle Solaris executes to compromise Oracle Solaris.  Successful attacks of this vulnerability can result in takeover of Oracle Solaris. CVSS 3.1 Base Score 8.4 (Confidentiality, Integrity and Availability impacts).  CVSS Vector: (CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_