CVE-2026-8933
snap-confine Local Privilege Escalation via Capabilities Misconfiguration or Flaw in Execution Environment Setup
- Published
- Jul 21, 2026
- Updated
- Jul 22, 2026
- Assigning CNA
- canonical
- Evidence observed
- Nov 4, 2026
Primary CVSS
nvd · CVSS 3.1
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HLow · next 30 days
- Percentile
- 7.4%
- Model date
- Nov 4, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
Summary
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.
Sources
C proof-of-concept for CVE-2026-8933, a snap-confine local privilege escalation using cgroup freezing, symlink races, and udev rule injection to execute commands as root.
Working PoC for CVE-2026-8933: a snap-confine mount-namespace symlink race that plants a root-owned udev rule, yielding local root via systemd-udevd.
Responsible use
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