CVE-2026-47328
Analyzed Analyzed - Analysis Complete
AppArmor SAUCE Patch Memory Leak in Ubuntu Linux

Publication date: 2026-05-28

Last updated on: 2026-06-09

Assigner: Canonical Ltd.

Description
Ubuntu Linux 6.8, 6.17 and 7.0 contain AppArmor SAUCE patches which incorrectly attempt to free a pointer which was not previously kmalloc()d, while at the same time leaking allocated memory. The bug can be triggered by an unprivileged local user and can result in the corruption of slab metadata and could lead to resource exhaustion.
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Meta Information
Published
2026-05-28
Last Modified
2026-06-09
Generated
2026-06-18
AI Q&A
2026-05-29
EPSS Evaluated
2026-06-16
NVD
CVE-2026-47328
EUVD
EUVD-2026-32983
Affected Vendors & Products
Showing 3 associated CPEs
Vendor Product Version / Range
canonical ubuntu_linux 24.04
canonical ubuntu_linux 25.10
canonical ubuntu_linux 26.04
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-590 The product calls free() on a pointer to memory that was not allocated using associated heap allocation functions such as malloc(), calloc(), or realloc().
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Compliance Impact

The provided information does not specify any direct impact of this vulnerability on compliance with common standards and regulations such as GDPR or HIPAA.

Executive Summary

This vulnerability exists in Ubuntu Linux versions 6.8, 6.17, and 7.0 within the AppArmor SAUCE patches. It involves an incorrect attempt to free a pointer that was not previously allocated using kmalloc(), which is a kernel memory allocation function. At the same time, this bug causes allocated memory to leak. The issue can be triggered by an unprivileged local user.

Specifically, the bug can corrupt slab metadata, which is part of the kernel's memory management system, and may lead to resource exhaustion.

Impact Analysis

The vulnerability can be exploited by an unprivileged local user to cause corruption of slab metadata in the kernel memory management system. This corruption can lead to resource exhaustion, potentially causing system instability or denial of service.

Because the issue involves leaking allocated memory and improper freeing of pointers, it may degrade system performance or cause crashes, impacting availability.

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