CVE-2026-8933: Ubuntu security flaw breaks Snap sandbox protections
Qualys disclosed CVE-2026-8933, a high-severity Ubuntu flaw that lets local attackers gain root privileges through a race condition in snap-confine. Qualys has disclosed a high-severity local privilege escalation vulnerability, tracked as CVE-2026-8933 (CVSS score of 7.8), affecting default installations of Ubuntu Desktop 24.04, 25.10, and 26.04. The flaw stems from a race condition introduced during a […]
Qualys has disclosed a high-severity local privilege escalation vulnerability, tracked as CVE-2026-8933 (CVSS score of 7.8), affecting default installations of Ubuntu Desktop 24.04, 25.10, and 26.04. The flaw stems from a race condition introduced during a security hardening change in the snap-confine sandbox initialization process. An unprivileged local attacker could exploit the issue to gain root access and take full control of the affected system.
snap-confine is a privileged security component of Snap, Ubuntu’s package and application management system. It is responsible for launching Snap applications inside a sandbox, restricting their access to the rest of the operating system. snapd is the background service (daemon) that manages Snap packages on Linux systems, especially Ubuntu. It installs, updates, removes, and runs Snap applications, while enforcing their security policies.
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