CVE-2020-14394 Denial of service in QEMU
A privileged guest user can cause a denial of service by triggering an infinite loop in QEMU's USB xHCI controller emulation.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2020-14394?
CVE-2020-14394 is a low-severity denial of service vulnerability in Fedoraproject Extra Packages for Enterprise Linux, published on 17 Aug 2022. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
An infinite loop flaw was found in the USB xHCI controller emulation of QEMU while computing the length of the Transfer Request Block (TRB) Ring. This flaw allows a privileged guest user to hang the QEMU process on the host, resulting in a denial of service.
Weakness: CWE-835
Which versions are affected by CVE-2020-14394?
It affects 5 products.
Products include Fedoraproject Extra Packages for Enterprise Linux, Fedoraproject Fedora, Qemu Qemu, Redhat Enterprise Linux, Redhat Openstack Platform.
How do I fix CVE-2020-14394?
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-2020-14394 being exploited?
There is no known exploitation of CVE-2020-14394 in the wild and no public exploit code.
Other vulnerabilities in Fedoraproject Extra Packages for Enterprise Linux
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- CVE-2022-4170 Code injection in rxvt-unicode
- CVE-2022-40315 Moodle Minor SQL injection risk in admin user browsing
- CVE-2022-45152 Moodle blind Server-Side Request Forgery (SSRF) vulnerability in LTI provider library
- CVE-2022-24882 Server side NTLM does not properly check parameters in FreeRDP
All Fedoraproject Extra Packages for Enterprise Linux vulnerabilities
Sources
Also known as DEBIAN-CVE-2020-14394, GHSA-9gg5-9c3q-7g76, OESA-2022-1918, UBUNTU-CVE-2020-14394.