CVE-2022-49774 KVM: x86/xen: Fix eventfd error handling in kvm_xen_eventfd_assign()
A flaw in Linux kernel KVM Xen eventfd handling causes a null pointer dereference, leading to a denial of service.
- 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-2022-49774?
CVE-2022-49774 is a medium-severity vulnerability in Linux kernel, published on 1 May 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
KVM: x86/xen: Fix eventfd error handling in kvm_xen_eventfd_assign()
Should not call eventfd_ctx_put() in case of error.
[Introduce new goto target instead. - Paolo]
Which versions are affected by CVE-2022-49774?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2022-49774?
Apply the vendor's patch.
Is CVE-2022-49774 being exploited?
There is no known exploitation of CVE-2022-49774 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as DEBIAN-CVE-2022-49774, GHSA-7jp4-523x-8hmf, UBUNTU-CVE-2022-49774.