CVE-2026-47330 Canonical CVE debrief

Who should care

System administrators managing Ubuntu Linux deployments with AppArmor enabled; security teams responsible for kernel security posture; organizations running affected Ubuntu versions (6.8, 7.17, 7.0) who need to track kernel patch availability.

Technical summary

The vulnerability exists in AppArmor SAUCE patches within Ubuntu Linux kernel versions 6.8, 7.17, and 7.0. The notification handling code contains a path where an uninitialized variable may be used, which can be triggered by an unprivileged local user. This leads to incorrect caching of AppArmor notification responses. The issue is classified under CWE-457 (Use of Uninitialized Variable). The attack requires local access with low privileges, has low complexity, and results in low integrity impact with no confidentiality or availability impact.

Defensive priority

LOW

Recommended defensive actions

• Review Ubuntu security notices for kernel updates addressing CVE-2026-47330
• Apply kernel patches from Ubuntu when available, prioritizing systems with AppArmor enabled
• Monitor for updated AppArmor SAUCE patches in Ubuntu kernel repositories
• Audit systems running Ubuntu Linux 6.8, 7.17, or 7.0 for this vulnerability
• Consider restricting unprivileged local access where feasible as a compensating control

Evidence notes

The vulnerability description identifies specific Ubuntu Linux kernel versions (6.8, 7.17, 7.0) containing AppArmor SAUCE patches with the uninitialized variable issue. The CVSS vector indicates local attack vector with low attack complexity, requiring low privileges and no user interaction, with no confidentiality impact, low integrity impact, and no availability impact. The weakness is classified as CWE-457 (Use of Uninitialized Variable) per [email protected].

Official resources