CVE-2026-47326 Memory leak in Ubuntu Linux AppArmor large notification response allocation

What is CVE-2026-47326?

CVE-2026-47326 is a medium-severity denial of service vulnerability in Canonical Ubuntu Linux, published on 28 May 2026. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

Ubuntu Linux 6.8, 6.17 and 7.0 contain SAUCE patches with a memory leak in the handling of big responses to AppArmor notifications. The bug can be triggered by an unprivileged local user. The memory leak could lead to resource exhaustion.

Weakness: CWE-401

Which versions are affected by CVE-2026-47326?

It affects 1 product.

Products include Canonical Ubuntu Linux.

How do I fix CVE-2026-47326?

Apply the vendor's patch.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2026-47326 being exploited?

There is no known exploitation of CVE-2026-47326 in the wild and no public exploit code.

Other vulnerabilities in Canonical Ubuntu Linux

• CVE-2020-11651 SaltStack Salt Authentication Bypass Exploited Critical 9.8
• CVE-2020-7247 OpenSMTPD Remote Code Execution Exploited Critical 9.8
• CVE-2019-16928 Exim Out-of-bounds Write Exploited Critical 9.8
• CVE-2018-6789 Exim Buffer Overflow Exploited Critical 9.8
• CVE-2015-2590 Oracle Java SE and Java SE Embedded Remote Code Execution Exploited Critical 9.8

All Canonical Ubuntu Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-rpqm-wqwm-759w, UBUNTU-CVE-2026-47326.