CVE-2026-47334 Deadlock or kernel panic in Ubuntu Linux AppArmor notification handling

What is CVE-2026-47334?

CVE-2026-47334 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 AppArmor SAUCE patches which incorrectly sleep while holding a spinlock in notification handling code. The bug can be triggered by an unprivileged local user and can result in kernel panic or deadlock.

Weakness: CWE-833

Which versions are affected by CVE-2026-47334?

It affects 1 product.

Products include Canonical Ubuntu Linux.

How do I fix CVE-2026-47334?

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-2026-47334 being exploited?

There is no known exploitation of CVE-2026-47334 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-h65w-p466-mpmx, UBUNTU-CVE-2026-47334.