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

What is CVE-2026-47328?

CVE-2026-47328 is a medium-severity memory corruption 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 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.

Weakness: CWE-590

Which versions are affected by CVE-2026-47328?

It affects 1 product.

Products include Canonical Ubuntu Linux.

How do I fix CVE-2026-47328?

Apply the vendor's patch.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2026-47328 being exploited?

There is no known exploitation of CVE-2026-47328 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-5x7q-wm95-r63c, UBUNTU-CVE-2026-47328.