CVE-2018-16884 Use after free in kernel:

What is CVE-2018-16884?

CVE-2018-16884 is a medium-severity use after free vulnerability in Canonical Ubuntu Linux, published on 18 Dec 2018. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

A flaw was found in the Linux kernel's NFS41+ subsystem. NFS41+ shares mounted in different network namespaces at the same time can make bc_svc_process() use wrong back-channel IDs and cause a use-after-free vulnerability. Thus a malicious container user can cause a host kernel memory corruption and a system panic. Due to the nature of the flaw, privilege escalation cannot be fully ruled out.

Weakness: CWE-416

Which versions are affected by CVE-2018-16884?

It affects 5 products.

Products include Canonical Ubuntu Linux, Debian Debian Linux, Linux kernel, Redhat Enterprise Linux, Redhat Enterprise Mrg.

How do I fix CVE-2018-16884?

Apply the vendor's patch.

Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.

Is CVE-2018-16884 being exploited?

There is no known exploitation of CVE-2018-16884 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 DEBIAN-CVE-2018-16884, GHSA-cxqg-5c27-qx45, SUSE-SU-2019:0236-1, SUSE-SU-2019:0298-1, SUSE-SU-2019:0326-1, SUSE-SU-2019:0356-1 and 1 more.