CVE-2026-47328: Invalid pointer deallocation in Ubuntu Linux AppArmor notification handling

Published May 28, 2026
·
Updated

Last updated 5 June 2026

Other sources

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.

— NVD

Affected Software

5 affected componentsFixes available
debian/linux
5.10.223-15.10.257-16.1.170-36.1.174-16.12.86-16.12.90-27.0.10-1
Ubuntu apparmor=6.8, =6.17, =7.0
Canonical Ubuntu Linux=24.04
Canonical Ubuntu Linux=25.10
Canonical Ubuntu Linux=26.04

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade debian/linux to a version that resolves this vulnerability.

    Fixed in 5.10.223-1Fixed in 5.10.257-1Fixed in 6.1.170-3Fixed in 6.1.174-1Fixed in 6.12.86-1Fixed in 6.12.90-2Fixed in 7.0.10-1
  2. Upgrade

    Upgrade debian/linux to a version that resolves this vulnerability.

    Fixed in 5.10.223-1
  3. Upgrade

    Upgrade debian/linux to a version that resolves this vulnerability.

    Fixed in 5.10.257-1
  4. Upgrade

    Upgrade debian/linux to a version that resolves this vulnerability.

    Fixed in 6.1.170-3
  5. Upgrade

    Upgrade debian/linux to a version that resolves this vulnerability.

    Fixed in 6.1.174-1
  6. Upgrade

    Upgrade debian/linux to a version that resolves this vulnerability.

    Fixed in 6.12.86-1
  7. Upgrade

    Upgrade debian/linux to a version that resolves this vulnerability.

    Fixed in 6.12.90-2
  8. Upgrade

    Upgrade debian/linux to a version that resolves this vulnerability.

    Fixed in 7.0.10-1

Event History

May 28, 2026
CVE Published
via MITRE·06:27 PM
Data Sourced
via MITRE·06:27 PM
DescriptionSeverityWeakness
Data Sourced
via NVD·07:16 PM
DescriptionSeverityWeakness
Data Sourced
via NVD·07:16 PM
RemedyAffected Software
Jun 3, 2026
Data Sourced
via Debian·03:38 PM
DescriptionAffected Software
Data Sourced
via Launchpad·03:38 PM
Description
Jun 6, 2026
Data Sourced
via Ubuntu·03:40 PM
RemedyDescriptionSeverityAffected Software
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Frequently Asked Questions

1

What is the severity of CVE-2026-47328?

The severity of CVE-2026-47328 is categorized as medium, with a CVSS score of 6.1.

2

How can I mitigate CVE-2026-47328?

Mitigation of CVE-2026-47328 involves updating Ubuntu Linux to the latest version that addresses the vulnerability.

3

Who is affected by CVE-2026-47328?

CVE-2026-47328 affects users of Ubuntu Linux versions 6.8, 6.17, and 7.0.

4

What type of vulnerability is CVE-2026-47328?

CVE-2026-47328 is an invalid pointer deallocation vulnerability in AppArmor notification handling.

5

Can CVE-2026-47328 be exploited by unprivileged users?

Yes, CVE-2026-47328 can be triggered by an unprivileged local user.

Company

Resources

Contact

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