The kvm_arch_vcpu_ioctl_set_sregs function in the KVM in Linux kernel 2.6 before 2.6.30, when running on x86 systems, does not validate the page table root in a KVM_SET_SREGS call, which allows local users to cause a denial of service (crash or hang) via a crafted cr3 value, which triggers a NULL pointer dereference in the gfn_to_rmap function.
A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Linux_kernel | Linux | 2.6.0 (including) | 2.6.30 (excluding) |
| Kvm | Ubuntu | hardy | * |
| Kvm | Ubuntu | intrepid | * |
| Kvm | Ubuntu | jaunty | * |
| Kvm | Ubuntu | upstream | * |
| Linux | Ubuntu | hardy | * |
| Linux | Ubuntu | intrepid | * |
| Linux | Ubuntu | jaunty | * |
| Linux | Ubuntu | upstream | * |
| Linux-ec2 | Ubuntu | maverick | * |
| Linux-ec2 | Ubuntu | upstream | * |
| Linux-fsl-imx51 | Ubuntu | upstream | * |
| Linux-lts-backport-maverick | Ubuntu | upstream | * |
| Linux-mvl-dove | Ubuntu | karmic | * |
| Linux-mvl-dove | Ubuntu | upstream | * |
| Linux-source-2.6.15 | Ubuntu | dapper | * |
| Linux-source-2.6.15 | Ubuntu | upstream | * |
| Linux-ti-omap4 | Ubuntu | upstream | * |