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PatchSiren cyber security CVE debrief

CVE-2026-47330 Canonical CVE debrief

A vulnerability in Ubuntu Linux kernel AppArmor SAUCE patches allows unprivileged local users to trigger use of an uninitialized variable in notification handling code, potentially causing incorrect caching of AppArmor notification responses. The issue affects Ubuntu Linux versions 6.8, 7.17, and 7.0. The vulnerability has a LOW severity CVSS score of 3.3 and was published on May 28, 2026. The root cause is classified as CWE-457 (Use of Uninitialized Variable).

Vendor
Canonical
Product
Ubuntu Linux
CVSS
LOW 3.3
CISA KEV
Not listed in stored evidence
Original CVE published
2026-05-28
Original CVE updated
2026-06-09
Advisory published
2026-05-28
Advisory updated
2026-06-09

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].

Sources and references

Verified primary and authoritative sources

  • CVE-2026-47330 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-47330

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-47330 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-47330

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.