CVE-2019-20811 Use after free in n/a
A reference count mishandling in the Linux kernel network subsystem allows attackers to cause use-after-free conditions, potentially leading to privilege escalation or system crashes.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2019-20811?
CVE-2019-20811 is a medium-severity use after free vulnerability in Canonical Ubuntu Linux, published on 3 Jun 2020. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
An issue was discovered in the Linux kernel before 5.0.6. In rx_queue_add_kobject() and netdev_queue_add_kobject() in net/core/net-sysfs.c, a reference count is mishandled, aka CID-a3e23f719f5c.
Which versions are affected by CVE-2019-20811?
It affects 3 products.
Products include Canonical Ubuntu Linux, Debian Debian Linux, Linux kernel.
How do I fix CVE-2019-20811?
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-2019-20811 being exploited?
There is no known exploitation of CVE-2019-20811 in the wild and no public exploit code.
Other vulnerabilities in Canonical Ubuntu Linux
Sources
Also known as DEBIAN-CVE-2019-20811, GHSA-9758-m2fm-98xg, UBUNTU-CVE-2019-20811.