CVE-2026-98638

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

KVM: arm64: Validate the SVE vector length in pkvm_vcpu_init_sve()

pkvm_vcpu_init_sve() clamps only the upper bound of the host-provided

sve_max_vl, so an invalid vector length reaches sve_state_size_from_vl()

and the WARN_ON() there, which is fatal at EL2. The existing

!sve_state_size test rejects such a length, but only after the macro has

run.

Check sve_vl_valid() before deriving the state size. A valid length

cannot yield a zero size, so the !sve_state_size test goes with it.