CVE-2026-47328

Kernel memory corruption via invalid AppArmor free

Published May 28, 2026 · Updated May 28, 2026

Invalid free in AppArmor notification handling in Canonical Ubuntu Linux 6.8, 6.17 and 7.0 allows local users to corrupt kernel memory. Ubuntu's SAUCE notification patches pass a pointer not allocated by kmalloc() to the kernel deallocator while also losing an allocated buffer. An unprivileged local user can trigger the path, corrupt slab metadata, and exhaust kernel memory; no confidentiality impact is reported.

CVSS severity6.1
Medium
EPSS probability0.09%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Invalid free in AppArmor notification handling in Canonical Ubuntu Linux 6.8, 6.17 and 7.0 allows local users to corrupt kernel memory. Ubuntu's SAUCE notification patches pass a pointer not allocated by kmalloc() to the kernel deallocator while also losing an allocated buffer. An unprivileged local user can trigger the path, corrupt slab metadata, and exhaust kernel memory; no confidentiality impact is reported.

The record

CVE
CVE-2026-47328
Published
May 28, 2026
Updated
May 28, 2026
Vendor
Canonical
Product
Ubuntu
Classifications
CWE-590, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 28, 2026CVE publishedPublication date reported by the CVE source.
  2. May 28, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=6.17.0 <6.17.0-35.35
  2. Affected versionversion=6.8.0 <6.8.0-124.124
  3. Affected versionversion=7.0.0 <7.0.0-22.22

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Canonical · Ubuntuversion=6.17.0 <6.17.0-35.35; version=6.8.0 <6.8.0-124.124; version=7.0.0 <7.0.0-22.22

Published CVSS scores

6.1Canonical Ltd.CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-590Free of Memory not on the Heap
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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