Canonical Ubuntu Linux 6.8/6.17/7.0 AppArmor kmalloc free of memory not on the heap

CVSS Meta Temp Score
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CTI Interest Score
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5.1$0-$5k0.00

Summaryinfo

A vulnerability marked as problematic has been reported in Canonical Ubuntu Linux 6.8/6.17/7.0. The affected element is the function kmalloc of the component AppArmor. Performing a manipulation results in free of memory not on the heap. This vulnerability is reported as CVE-2026-47328. The attack requires a local approach. No exploit exists. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic has been found in Canonical Ubuntu Linux 6.8/6.17/7.0. This affects the function kmalloc of the component AppArmor. The manipulation with an unknown input leads to a free of memory not on the heap vulnerability. CWE is classifying the issue as 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(). This is going to have an impact on integrity, and availability. The summary by CVE is:

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.

The weakness was disclosed by Tristan Madani. It is possible to read the advisory at git.launchpad.net. This vulnerability is uniquely identified as CVE-2026-47328 since 05/19/2026. The exploitability is told to be easy. Attacking locally is a requirement. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 321369 (Ubuntu 22.04 LTS : Linux kernel (Azure) vulnerabilities (USN-8440-1)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.8.0-124.124, 6.17.0-35.35 or 7.0.0-22.22 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at git.launchpad.net. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at Tenable (321369). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

Vendor

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.2
VulDB Meta Temp Score: 5.1

VulDB Base Score: 4.4
VulDB Temp Score: 4.2
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 6.1
CNA Vector (canonical): 🔒

CVSSv2info

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Free of memory not on the heap
CWE: CWE-590
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: No

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 321369
Nessus Name: Ubuntu 22.04 LTS : Linux kernel (Azure) vulnerabilities (USN-8440-1)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Ubuntu Linux 6.8.0-124.124/6.17.0-35.35/7.0.0-22.22
Patch: git.launchpad.net

Timelineinfo

05/19/2026 CVE reserved
05/28/2026 +9 days Advisory disclosed
05/28/2026 +0 days VulDB entry created
06/19/2026 +22 days VulDB entry last update

Sourcesinfo

Advisory: git.launchpad.net
Researcher: Tristan Madani
Status: Confirmed

CVE: CVE-2026-47328 (🔒)
GCVE (CVE): GCVE-0-2026-47328
GCVE (VulDB): GCVE-100-366867

Entryinfo

Created: 05/28/2026 22:25
Updated: 06/19/2026 14:53
Changes: 05/28/2026 22:25 (67), 06/19/2026 14:53 (2)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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