CVE-2022-49557 x86/fpu: KVM: Set the base guest FPU uABI size to sizeof(struct kvm_xsave)

In the Linux kernel, the following vulnerability has been resolved: x86/fpu: KVM: Set the base guest FPU uABI size to sizeofstruct kvmxsave Set the starting uABI size of KVM's guest FPU to 'struct kvmxsave', i.e. to KVM's historical uABI size. When saving FPU state for usersapce, KVM well, now th...

CVE-2022-49557

CVE-2022-49557 relates to the Linux kernel, specifically the x86 fpu KVM path. The vulnerability arises when the guest FPU uABI size is set to the host default instead of the historical KVM uABI size, causing the kernel to configure the XSAVE header in a way that can lead to out-of-bounds writes ...