CVE-2022-48793 KVM: x86: nSVM: fix potential NULL derefernce on nested migration
A NULL pointer dereference in the Linux kernel's KVM nested SVM implementation can cause a system crash during nested migration.
- 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-2022-48793?
CVE-2022-48793 is a medium-severity vulnerability in Linux kernel, published on 16 Jul 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: nSVM: fix potential NULL derefernce on nested migration
Turns out that due to review feedback and/or rebases I accidentally moved the call to nested_svm_load_cr3 to be too early, before the NPT is enabled, which is very wrong to do.
KVM can't even access guest memory at that point as nested NPT is needed for that, and of course it won't initialize the walk_mmu, which is main issue the patch was addressing.
Fix this for real.
Weakness: CWE-476
Which versions are affected by CVE-2022-48793?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2022-48793?
Apply the vendor's patch.
Is CVE-2022-48793 being exploited?
There is no known exploitation of CVE-2022-48793 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as DEBIAN-CVE-2022-48793, GHSA-p5hp-9793-2w9c, UBUNTU-CVE-2022-48793.