CVE-2023-52639 KVM: s390: vsie: fix race during shadow creation
A race condition in the Linux kernel's KVM s390 subsystem can cause a crash when accessing uninitialized private data during shadow creation.
- 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-2023-52639?
CVE-2023-52639 is a medium-severity vulnerability in Linux kernel, published on 3 Apr 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: s390: vsie: fix race during shadow creation
Right now it is possible to see gmap->private being zero in kvm_s390_vsie_gmap_notifier resulting in a crash. This is due to the fact that we add gmap->private == kvm after creation:
static int acquire_gmap_shadow(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) { [...] gmap = gmap_shadow(vcpu->arch.gmap, asce, edat); if (IS_ERR(gmap)) return PTR_ERR(gmap); gmap->private = vcpu->kvm;
Let children inherit the private field of the parent.
Weakness: CWE-362
Which versions are affected by CVE-2023-52639?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2023-52639?
Apply the vendor's patch.
Is CVE-2023-52639 being exploited?
There is no known exploitation of CVE-2023-52639 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2023-52639, DEBIAN-CVE-2023-52639, GHSA-82mq-c3x3-cpp9, ROOT-OS-DEBIAN-11-CVE-2023-52639, UBUNTU-CVE-2023-52639.