CVE-2026-43214

*** Pendiente de traducción *** In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> KVM: x86: Add SRCU protection for reading PDPTRs in __get_sregs2()<br /> <br /> Add SRCU read-side protection when reading PDPTR registers in<br /> __get_sregs2().<br /> <br /> Reading PDPTRs may trigger access to guest memory:<br /> kvm_pdptr_read() -&gt; svm_cache_reg() -&gt; load_pdptrs() -&gt;<br /> kvm_vcpu_read_guest_page() -&gt; kvm_vcpu_gfn_to_memslot()<br /> <br /> kvm_vcpu_gfn_to_memslot() dereferences memslots via __kvm_memslots(),<br /> which uses srcu_dereference_check() and requires either kvm-&gt;srcu or<br /> kvm-&gt;slots_lock to be held. Currently only vcpu-&gt;mutex is held,<br /> triggering lockdep warning:<br /> <br /> =============================<br /> WARNING: suspicious RCU usage in kvm_vcpu_gfn_to_memslot<br /> 6.12.59+ #3 Not tainted<br /> <br /> include/linux/kvm_host.h:1062 suspicious rcu_dereference_check() usage!<br /> <br /> other info that might help us debug this:<br /> <br /> rcu_scheduler_active = 2, debug_locks = 1<br /> 1 lock held by syz.5.1717/15100:<br /> #0: ff1100002f4b00b0 (&amp;vcpu-&gt;mutex){+.+.}-{3:3}, at: kvm_vcpu_ioctl+0x1d5/0x1590<br /> <br /> Call Trace:<br /> <br /> __dump_stack lib/dump_stack.c:94 [inline]<br /> dump_stack_lvl+0xf0/0x120 lib/dump_stack.c:120<br /> lockdep_rcu_suspicious+0x1e3/0x270 kernel/locking/lockdep.c:6824<br /> __kvm_memslots include/linux/kvm_host.h:1062 [inline]<br /> __kvm_memslots include/linux/kvm_host.h:1059 [inline]<br /> kvm_vcpu_memslots include/linux/kvm_host.h:1076 [inline]<br /> kvm_vcpu_gfn_to_memslot+0x518/0x5e0 virt/kvm/kvm_main.c:2617<br /> kvm_vcpu_read_guest_page+0x27/0x50 virt/kvm/kvm_main.c:3302<br /> load_pdptrs+0xff/0x4b0 arch/x86/kvm/x86.c:1065<br /> svm_cache_reg+0x1c9/0x230 arch/x86/kvm/svm/svm.c:1688<br /> kvm_pdptr_read arch/x86/kvm/kvm_cache_regs.h:141 [inline]<br /> __get_sregs2 arch/x86/kvm/x86.c:11784 [inline]<br /> kvm_arch_vcpu_ioctl+0x3e20/0x4aa0 arch/x86/kvm/x86.c:6279<br /> kvm_vcpu_ioctl+0x856/0x1590 virt/kvm/kvm_main.c:4663<br /> vfs_ioctl fs/ioctl.c:51 [inline]<br /> __do_sys_ioctl fs/ioctl.c:907 [inline]<br /> __se_sys_ioctl fs/ioctl.c:893 [inline]<br /> __x64_sys_ioctl+0x18b/0x210 fs/ioctl.c:893<br /> do_syscall_x64 arch/x86/entry/common.c:52 [inline]<br /> do_syscall_64+0xbd/0x1d0 arch/x86/entry/common.c:83<br /> entry_SYSCALL_64_after_hwframe+0x77/0x7f<br /> <br /> Found by Linux Verification Center (linuxtesting.org) with Syzkaller.