CVE-2026-47336 Use of uninitialized value in Ubuntu Linux AppArmor IPv4/IPv6 socket mediation rules

What is CVE-2026-47336?

CVE-2026-47336 is a low-severity 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 contains SAUCE patches with a possible use of an uninitialized variable in AppArmor AF_INET/AF_INET6 socket mediation code. The bug can be triggered by an unprivileged local user and could result in incorrect fine-grained mediation of network sockets.

Weakness: CWE-457

Which versions are affected by CVE-2026-47336?

It affects 1 product.

Products include Canonical Ubuntu Linux.

How do I fix CVE-2026-47336?

Apply the vendor's patch.

Is CVE-2026-47336 being exploited?

There is no known exploitation of CVE-2026-47336 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-cmg4-qjv8-qjh6, UBUNTU-CVE-2026-47336.