CVE-2026-8933
snap-confine Local Privilege Escalation via Capabilities Misconfiguration or Flaw in Execution Environment Setup
No known exploitation. EPSS puts it in the 7th percentile. Fixed versions are out.
What to do
Find your product and version, then upgrade to the build on the right.
- Canonical Ubuntu 26.04 LTSFixed builds2.76+ubuntu26.04.3, 2.76+ubuntu24.04.1, 2.76+ubuntu22.04.1Stated by: CVE record
Versions as the sources state them. Full version matrix after sign-in
Coverage timeline
2 publishersTechnical analysis published
Local privilege escalation vulnerability (CVE-2026-8933) in Ubuntu's snap-confine allows unprivileged users to gain root access.
Sourced from public security reporting — each date is when it was published, not when it happened. 1 further article named this CVE in wider roundups without reporting it as a distinct event.
What it is
From the CVE record
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.
In plain language
No plain-language summary for this CVE yet.
Exploitation
Where each signal puts this CVE on the scale from published to confirmed exploited.
- CISA KEV
Not in the catalog. CISA has not confirmed exploitation.
- Public exploits
No public exploit or proof of concept found in the sources we track.
- EPSS
0.2% chance of exploitation activity in the next 30 days, which ranks it in the 7th percentile of scored CVEs.
Exploit Prediction Scoring System, FIRST.org. A probability, not a confirmation.
Lifecycle
7 events over 2 days, from the signal feeds we watch.
- OpenVAS check added
- Record updated
- Publishedweakness classified, att&ck mapped, record updated, record updated
Affected products
And 3 more affected products. See all after sign-in
Technical detail
CVSS 3.1 vector
Open in the CVSS calculatorCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Scored 7.8 by NVD.
How it is reached
- Attack Vector LocalRequires local access to the vulnerable system (e.g. local login, malicious file)
- Attack Complexity LowNo special conditions — the attack can be reliably reproduced
- Privileges Required LowRequires basic user-level privileges
- User Interaction NoneNo user interaction needed — fully automated exploitation
Scope
- Scope UnchangedImpact is limited to the vulnerable component itself
Impact if exploited
- Confidentiality HighTotal information disclosure — all data in the component is compromised
- Integrity HighTotal loss of integrity — attacker can modify any data in the component
- Availability HighTotal denial of service — the component is completely unavailable
Weaknesses
ATT&CK techniques
Mapped from the weaknesses above (CWE to ATT&CK), not observed in attacks.
Sources
References in the record
In the news
- ⚡ Weekly Recap: Rogue AI Agents, Check Point Exploit, Slopsquatting, ClickFix Lures and More
- Nine-Year-Old RefluXFS Linux Flaw Gives Local Users Root on Default RHEL Installs
- Ubuntu snap-confine Flaw Could Give Local Users Root on Default Desktop Installs
- CVE-2026-8933: Local Privilege Escalation in Set-Capabilities snap-confine
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