CVE-2026-47328: CWE-590 Free of memory not on the heap in Canonical Ubuntu Linux
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.
AI Analysis
Technical Summary
Ubuntu Linux versions 6.8.0, 6.17.0, and 7.0.0 include AppArmor SAUCE patches that incorrectly free a pointer not allocated via kmalloc(), causing a CWE-590 type vulnerability (free of memory not on the heap). This bug can be exploited by an unprivileged local user to corrupt slab allocator metadata and cause resource exhaustion. The issue does not impact confidentiality but can affect system integrity and availability. No known exploits are reported in the wild, and no patch or official remediation level has been disclosed by Canonical as of the publication date.
Potential Impact
The vulnerability allows an unprivileged local user to corrupt kernel slab metadata and potentially exhaust system resources. This can lead to denial of service conditions affecting system availability. There is no impact on confidentiality, and integrity impact is limited to potential corruption of kernel memory management structures.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no official fix or remediation level has been provided by Canonical, users should monitor Canonical's security advisories for updates. Until a patch is available, restricting local user access and minimizing untrusted local user activity may reduce risk.
CVE-2026-47328: CWE-590 Free of memory not on the heap in Canonical Ubuntu Linux
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.
CVSS v3.1
Score 6.1medium
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Ubuntu Linux versions 6.8.0, 6.17.0, and 7.0.0 include AppArmor SAUCE patches that incorrectly free a pointer not allocated via kmalloc(), causing a CWE-590 type vulnerability (free of memory not on the heap). This bug can be exploited by an unprivileged local user to corrupt slab allocator metadata and cause resource exhaustion. The issue does not impact confidentiality but can affect system integrity and availability. No known exploits are reported in the wild, and no patch or official remediation level has been disclosed by Canonical as of the publication date.
Potential Impact
The vulnerability allows an unprivileged local user to corrupt kernel slab metadata and potentially exhaust system resources. This can lead to denial of service conditions affecting system availability. There is no impact on confidentiality, and integrity impact is limited to potential corruption of kernel memory management structures.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no official fix or remediation level has been provided by Canonical, users should monitor Canonical's security advisories for updates. Until a patch is available, restricting local user access and minimizing untrusted local user activity may reduce risk.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- canonical
- Date Reserved
- 2026-05-19T10:37:36.433Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a188e08e29bf47b501d6817
Added to database: 5/28/2026, 6:48:40 PM
Last enriched: 5/28/2026, 7:05:09 PM
Last updated: 5/29/2026, 6:29:15 PM
Views: 8
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