# CVE-2026-8933 — Canonical Ubuntu 26.04 LTS

> As of 2026-07-22, CVE-2026-8933 is a HIGH-severity vulnerability in Canonical Ubuntu 26.04 LTS, CVSS v3.1 7.8, EPSS 0.1% (4.2th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-8933, most recently “CVE-2026-8933: Race Condition in Ubuntu snap-confine Enables Local Privilege Escalation to Root”.

**Last updated:** 2026-07-22

## What is CVE-2026-8933?

A local privilege escalation vulnerability exists in snap-confine, a set-capabilities core component used internally by Canonical snapd to construct the secure execution environment for snap applications. This vulnerability uniquely affects versions of snap-confine configured with set-capabilities (rather than standard set-uid-root installations). Due to a flaw in how privilege boundaries or security sandboxes are initialized when the binary runs under limited ambient capabilities, a local, unprivileged attacker can exploit this behavior to bypass intended restrictions and execute arbitrary code. Successful exploitation allows the local user to elevate their privileges to full root authority.

The record classifies CVE-2026-8933 under weakness class [CWE-250](https://cwe.mitre.org/data/definitions/250.html). Its CVSS v3 base vector states that the flaw requires local access to the host, needs low-privilege credentials, needs no user interaction, and has high impact on confidentiality, integrity, availability. 3 affected-product entries are recorded, across 1 vendor, listed below. The identifier was first published 76 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 7.8 — HIGH (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`)
- **EPSS (FIRST):** 0.1% probability of exploitation in the next 30 days, higher than 4.2% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 4.1/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-07-21, last modified 2026-07-22

## Is CVE-2026-8933 being exploited?

No public exploitation evidence for CVE-2026-8933 is recorded in the sources Threadlinqs tracks — CISA KEV, Exploit-DB, public proof-of-concept repositories and ProjectDiscovery Nuclei — as of 2026-07-22. That is an absence of evidence in those feeds, not a guarantee that the vulnerability is unexploited.

## Affected products and versions

- [Canonical](https://intel.threadlinqs.com/vendors/canonical): Ubuntu 26.04 LTS, Ubuntu 24.04 LTS, Ubuntu 22.04 LTS

## How to fix CVE-2026-8933

No vendor patch reference has been recorded for CVE-2026-8933 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-8933

1 tracked threat in the Threadlinqs corpus references CVE-2026-8933, either in the campaign’s CVE list or as an indicator on the campaign record.

- [CVE-2026-8933: Race Condition in Ubuntu snap-confine Enables Local Privilege Escalation to Root](https://intel.threadlinqs.com/threat/TL-2026-1633) — HIGH · 2026-07-22

## Sources

Enriched from CVE.org, NVD, FIRST EPSS, GitHub Security Advisories. Last verified by Threadlinqs on 2026-07-22. This product uses the NVD API but is not endorsed or certified by the NVD.

**Vulnerability database entry**

- [ubuntu.com — vdb entry](https://ubuntu.com/security/CVE-2026-8933)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-8933
Full detection coverage and IOCs for threats exploiting CVE-2026-8933 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp