Linux kernel KVM x86 race condition in __get_sregs2() PDPTR handling
CVE-2026-43214 is a flaw in the Linux kernel KVM x86 subsystem in the __get_sregs2() path when reading PDPTR registers. Reading PDPTRs can trigger guest-memory access through the call chain kvm_pdptr_read() -> svm_cache_reg() -> load_pdptrs() -> kvm_vcpu_read_guest_page() -> kvm_vcpu_gfn_to_memslot(). In the vulnerable path, kvm_vcpu_gfn_to_memslot() dereferences memslots via __kvm_memslots(), which uses srcu_dereference_check() and requires either kvm->srcu or kvm->slots_lock to be held. However, only vcpu->mutex was held. The issue was resolved by adding SRCU read-side protection around the PDPTR read path in __get_sregs2(). The bug was identified by the Linux Verification Center using Syzkaller.
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