CVE-2021-46907 Information

Description

In the Linux kernel the following vulnerability has been resolved:

KVM: VMX: Don’t use vcpu->run->internal.ndata as an array index

__vmx_handle_exit() uses vcpu->run->internal.ndata as an index for an array access. Since vcpu->run is (can be) mapped to a user address space with a writer permission the ’ndata’ could be updated by the user process at anytime (the user process can set it to outside the bounds of the array). So it is not safe that __vmx_handle_exit() uses the ’ndata’ that way.

Reference

https://git.kernel.org/stable/c/7f64753835a78c7d2cc2932a5808ef3b7fd4c050 https://git.kernel.org/stable/c/ce541d7b59566a0d94c7c99bfb5d34b050e6af70 https://git.kernel.org/stable/c/04c4f2ee3f68c9a4bf1653d15f1a9a435ae33f7a