CVE-2021-47407 KVM: x86: Handle SRCU initialization failure during page track init
A missing check for SRCU initialization failure in KVM page track init 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-2021-47407?
CVE-2021-47407 is a medium-severity vulnerability in Linux kernel, published on 21 May 2024. 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: Handle SRCU initialization failure during page track init
Check the return of init_srcu_struct(), which can fail due to OOM, when initializing the page track mechanism. Lack of checking leads to a NULL pointer deref found by a modified syzkaller.
[Move the call towards the beginning of kvm_arch_init_vm. - Paolo]
Weakness: CWE-476
Which versions are affected by CVE-2021-47407?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2021-47407?
Apply the vendor's patch.
Is CVE-2021-47407 being exploited?
There is no known exploitation of CVE-2021-47407 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as DEBIAN-CVE-2021-47407, GHSA-xchp-7x95-36g7, UBUNTU-CVE-2021-47407.