CVE-2026-8933
snap-confine Local Privilege Escalation via Capabilities Misconfiguration or Flaw in Execution Environment Setup
Description
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.
INFO
Published Date :
July 21, 2026, 3:16 p.m.
Last Modified :
July 22, 2026, 7:17 p.m.
Remotely Exploit :
No
Source :
[email protected]
Affected Products
The following products are affected by CVE-2026-8933
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | HIGH | cc1ad9ee-3454-478d-9317-d3e869d708bc | ||||
| CVSS 3.1 | HIGH | [email protected] |
Solution
- Update snapd to the latest version.
- Ensure snap-confine is correctly configured.
- Monitor system for unauthorized privilege changes.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-8933.
| URL | Resource |
|---|---|
| https://ubuntu.com/security/CVE-2026-8933 |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-8933 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-8933
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-8933 vulnerability anywhere in the article.
-
The Hacker News
Nine-Year-Old RefluXFS Linux Flaw Gives Local Users Root on Default RHEL Installs
RefluXFS, a new Linux kernel flaw disclosed on July 22 and tracked as CVE-2026-64600, lets an unprivileged local user overwrite root-owned files on an XFS filesystem and gain persistent root access. Q ... Read more
-
The Hacker News
Ubuntu snap-confine Flaw Could Give Local Users Root on Default Desktop Installs
Cybersecurity researchers have disclosed details of a new local privilege escalation (LPE) vulnerability in snap-confine that an unprivileged user can trigger to obtain root access and gain complete c ... Read more
The following table lists the changes that have been made to the
CVE-2026-8933 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jul. 22, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-8933', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-07-22T18:15:11.199548Z'} -
New CVE Received by [email protected]
Jul. 21, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://github.com/canonical/snapd/', 'versions': [{'status': 'affected', 'version': '2.75.0', 'lessThan': '2.76.1', 'versionType': 'semver'}], 'packageName': 'snapd', 'collectionURL': 'https://github.com/canonical', 'defaultStatus': 'unaffected'}, {'repo': 'https://launchpad.net/ubuntu/+source/snapd', 'vendor': 'Canonical', 'product': 'Ubuntu 26.04 LTS', 'versions': [{'status': 'unaffected', 'version': '2.76+ubuntu26.04.3', 'versionType': 'dpkg'}], 'platforms': ['Linux'], 'packageName': 'snapd', 'collectionURL': 'https://launchpad.net/ubuntu/resolute', 'defaultStatus': 'affected'}, {'repo': 'https://launchpad.net/ubuntu/+source/snapd', 'vendor': 'Canonical', 'product': 'Ubuntu 24.04 LTS', 'versions': [{'status': 'unaffected', 'version': '2.76+ubuntu24.04.1', 'versionType': 'dpkg'}], 'platforms': ['Linux'], 'packageName': 'snapd', 'collectionURL': 'https://launchpad.net/ubuntu/noble', 'defaultStatus': 'affected'}, {'repo': 'https://launchpad.net/ubuntu/+source/snapd', 'vendor': 'Canonical', 'product': 'Ubuntu 22.04 LTS', 'versions': [{'status': 'unaffected', 'version': '2.76+ubuntu22.04.1', 'versionType': 'dpkg'}], 'platforms': ['Linux'], 'packageName': 'snapd', 'collectionURL': 'https://launchpad.net/ubuntu/jammy', 'defaultStatus': 'affected'}] Added Description 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. Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Added CWE CWE-250 Added Reference https://ubuntu.com/security/CVE-2026-8933