CVE-2020-8992 Denial of service in n/a

What is CVE-2020-8992?

CVE-2020-8992 is a medium-severity denial of service vulnerability in Canonical Ubuntu Linux, published on 14 Feb 2020. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

ext4_protect_reserved_inode in fs/ext4/block_validity.c in the Linux kernel through 5.5.3 allows attackers to cause a denial of service (soft lockup) via a crafted journal size.

Weakness: CWE-834, CWE-400

Which versions are affected by CVE-2020-8992?

It affects 10 products.

Products include Canonical Ubuntu Linux, Linux kernel, Netapp Active Iq Unified Manager, Netapp Cloud Backup, Netapp Data Availability Services, Netapp H410c Firmware and 4 more.

How do I fix CVE-2020-8992?

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-2020-8992 being exploited?

There is no known exploitation of CVE-2020-8992 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-2020-8992, GHSA-44rm-95c5-h9cw, UBUNTU-CVE-2020-8992.