CVE-2026-98928

In the Linux kernel, the following vulnerability has been resolved:

KVM: arm64: Derive GUEST HAS SVE from the SVE feature bit at EL2

pkvm init features from host() takes KVM ARCH FLAG GUEST HAS SVE and KVM ARM VCPU SVE from the host separately, but pkvm vcpu init sve() tests the bit while vcpu has sve() reads the flag. A host that sets the flag without the bit gets a vCPU with a NULL sve state that the world switch loads the guest's SVE state from.

Derive the flag from the bit, and drop the protected path's copy of the host's flag, which is dead code since protected VMs are not allowed SVE.