CVE-2026-8933

high

Published 2026-07-21 · Modified 2026-07-22

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CVSS v3

7.8

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v4 NEW

—

not yet in upstream

VIR risk

7.8

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.

Predictions

Exploit likelihood

75%

Patch ETA

—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

No mitigations published for this CVE yet.

The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.

✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here with source_tier=community-verified.

OS impact

Ubuntu Fixed 6 releases

Version	Status	Fixed in
xenial	Fixed	`2.61.4ubuntu0.16.04.1+esm4`
resolute	Fixed	`2.76+ubuntu26.04.3`
noble	Fixed	`2.76+ubuntu24.04.1`
jammy	Fixed	`2.76+ubuntu22.04.1`
focal	Fixed	`2.67.1+20.04ubuntu1~esm3`
bionic	Fixed	`2.61.4ubuntu0.18.04.1+esm4`

References

CWEs

CWE-250

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.