CVE-2020-11935 aufs: improperly managed inode reference counts in the vfsub_dentry_open() method

What is CVE-2020-11935?

CVE-2020-11935 is a medium-severity denial of service vulnerability in Canonical Ubuntu Linux, published on 7 Apr 2023. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

It was discovered that aufs improperly managed inode reference counts in the vfsub_dentry_open() method. A local attacker could use this vulnerability to cause a denial of service attack.

Weakness: CWE-911

Which versions are affected by CVE-2020-11935?

It affects 2 products.

Products include Canonical Ubuntu Linux, Debian Debian Linux.

How do I fix CVE-2020-11935?

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-2020-11935 being exploited?

There is no known exploitation of CVE-2020-11935 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-m5wq-r6hh-xqf5, LSN-0070-1, ROOT-OS-UBUNTU-2204-CVE-2020-11935, UBUNTU-CVE-2020-11935.