CVE-2020-14314 Denial of service in kernel

What is CVE-2020-14314?

CVE-2020-14314 is a medium-severity denial of service vulnerability in Canonical Ubuntu Linux, published on 15 Sep 2020. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

A memory out-of-bounds read flaw was found in the Linux kernel before 5.9-rc2 with the ext3/ext4 file system, in the way it accesses a directory with broken indexing. This flaw allows a local user to crash the system if the directory exists. The highest threat from this vulnerability is to system availability.

Weakness: CWE-125

Which versions are affected by CVE-2020-14314?

It affects 4 products.

Products include Canonical Ubuntu Linux, Debian Debian Linux, Linux kernel, Starwindsoftware Starwind Virtual San.

How do I fix CVE-2020-14314?

Upgrade to a fixed version.

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-2020-14314 being exploited?

There is no known exploitation of CVE-2020-14314 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-2020-14314, GHSA-4vqp-m886-hqhq, UBUNTU-CVE-2020-14314.