CVE-2026-64287

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> KVM: arm64: Bound used_lrs when flushing the pKVM hyp vCPU<br /> <br /> flush_hyp_vcpu() copies the host vGIC state into the hyp&amp;#39;s private vCPU<br /> on every run. The vGIC list register save and restore use used_lrs as<br /> their loop bound and expect it to stay within the number of implemented<br /> list registers. While this is generally the case, flush_hyp_vcpu()<br /> copies vgic_v3 verbatim and does not enforce this, so a value provided<br /> by the host is used at EL2 to index vgic_lr[] and access ICH_LR_EL2<br /> (host -&gt; EL2).<br /> <br /> Fix by clamping used_lrs to the number of implemented list registers<br /> after the copy, as the trusted path already does in<br /> vgic_flush_lr_state(). The number of implemented list registers is<br /> constant after init, so it is replicated once from<br /> kvm_vgic_global_state.nr_lr into hyp_gicv3_nr_lr rather than read on<br /> every entry.