CVE-2024-43819 kvm: s390: Reject memory region operations for ucontrol VMs
A null pointer dereference in the Linux kernel KVM s390 subsystem allows local attackers to cause a denial of service by triggering specific memory region operations on ucontrol VMs.
- 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-2024-43819?
CVE-2024-43819 is a medium-severity vulnerability in Linux kernel, published on 17 Aug 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: Reject memory region operations for ucontrol VMs
This change rejects the KVM_SET_USER_MEMORY_REGION and KVM_SET_USER_MEMORY_REGION2 ioctls when called on a ucontrol VM. This is necessary since ucontrol VMs have kvm->arch.gmap set to 0 and would thus result in a null pointer dereference further in. Memory management needs to be performed in userspace and using the ioctls KVM_S390_UCAS_MAP and KVM_S390_UCAS_UNMAP.
Also improve s390 specific documentation for KVM_SET_USER_MEMORY_REGION and KVM_SET_USER_MEMORY_REGION2.
[[email protected]: commit message spelling fix, subject prefix fix]
Weakness: CWE-476
Which versions are affected by CVE-2024-43819?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2024-43819?
Apply the vendor's patch.
Is CVE-2024-43819 being exploited?
There is no known exploitation of CVE-2024-43819 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-48480, AZL-48517, BELL-CVE-2024-43819, DEBIAN-CVE-2024-43819, GHSA-p6j3-p28j-4x3h, ROOT-OS-DEBIAN-11-CVE-2024-43819 and 2 more.