CVE-2026-43214

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

KVM: x86: Add SRCU protection for reading PDPTRs in __get_sregs2()

Add SRCU read-side protection when reading PDPTR registers in

__get_sregs2().

Reading PDPTRs may trigger access to guest memory:

kvm_pdptr_read() -> svm_cache_reg() -> load_pdptrs() ->

kvm_vcpu_read_guest_page() -> kvm_vcpu_gfn_to_memslot()

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. Currently only vcpu->mutex is held,

triggering lockdep warning:

=============================

WARNING: suspicious RCU usage in kvm_vcpu_gfn_to_memslot

6.12.59+ #3 Not tainted

include/linux/kvm_host.h:1062 suspicious rcu_dereference_check() usage!

other info that might help us debug this:

rcu_scheduler_active = 2, debug_locks = 1

1 lock held by syz.5.1717/15100:

#0: ff1100002f4b00b0 (&vcpu->mutex){+.+.}-{3:3}, at: kvm_vcpu_ioctl+0x1d5/0x1590

Call Trace:

<TASK>

__dump_stack lib/dump_stack.c:94 [inline]

dump_stack_lvl+0xf0/0x120 lib/dump_stack.c:120

lockdep_rcu_suspicious+0x1e3/0x270 kernel/locking/lockdep.c:6824

__kvm_memslots include/linux/kvm_host.h:1062 [inline]

__kvm_memslots include/linux/kvm_host.h:1059 [inline]

kvm_vcpu_memslots include/linux/kvm_host.h:1076 [inline]

kvm_vcpu_gfn_to_memslot+0x518/0x5e0 virt/kvm/kvm_main.c:2617

kvm_vcpu_read_guest_page+0x27/0x50 virt/kvm/kvm_main.c:3302

load_pdptrs+0xff/0x4b0 arch/x86/kvm/x86.c:1065

svm_cache_reg+0x1c9/0x230 arch/x86/kvm/svm/svm.c:1688

kvm_pdptr_read arch/x86/kvm/kvm_cache_regs.h:141 [inline]

__get_sregs2 arch/x86/kvm/x86.c:11784 [inline]

kvm_arch_vcpu_ioctl+0x3e20/0x4aa0 arch/x86/kvm/x86.c:6279

kvm_vcpu_ioctl+0x856/0x1590 virt/kvm/kvm_main.c:4663

vfs_ioctl fs/ioctl.c:51 [inline]

__do_sys_ioctl fs/ioctl.c:907 [inline]

__se_sys_ioctl fs/ioctl.c:893 [inline]

__x64_sys_ioctl+0x18b/0x210 fs/ioctl.c:893

do_syscall_x64 arch/x86/entry/common.c:52 [inline]

do_syscall_64+0xbd/0x1d0 arch/x86/entry/common.c:83

entry_SYSCALL_64_after_hwframe+0x77/0x7f

Found by Linux Verification Center (linuxtesting.org) with Syzkaller.