Vulnerability in Canonical Ubuntu 22.04 Lts
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.002 (7.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 7th percentile — 7.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000
Affected products
- Canonical Ubuntu 22.04 Lts — versions 2.76+ubuntu22.04.1
- Canonical Ubuntu 24.04 Lts — versions 2.76+ubuntu24.04.1
- Canonical Ubuntu 26.04 Lts — versions 2.76+ubuntu26.04.3
Weakness classification (CWE)
Public proof-of-concept exploits
References
- ubuntu.com/security/CVE-2026-8933 (issue-tracking, vdb-entry)
Frequently asked questions
- What is CVE-2026-8933?
- CVE-2026-8933 is a high-severity vulnerability in Canonical Ubuntu 22.04 Lts, classified under CWE-250. CVSS score: 7.8/10. Published 2026-07-21.
- How severe is CVE-2026-8933?
- High severity. CVSS v3 base score is 7.8 out of 10.
- Is CVE-2026-8933 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.