{"id":"CVE-2026-43214","title":"KVM: x86: Add SRCU protection for reading PDPTRs in __get_sregs2()","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: x86: Add SRCU protection for reading PDPTRs in __get_sregs2()\n\nAdd SRCU read-side protection when reading PDPTR registers in\n__get_sregs2().\n\nReading PDPTRs may tr…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= 6dba940352038b56db9b591b172fb2ec76a5fd5e < f621ca24f9f489e226e22560761b04884984133b","Linux >= 6dba940352038b56db9b591b172fb2ec76a5fd5e < 708e20c66b2761d878a2bc3c7534e7f814e4dec5","Linux >= 6dba940352038b56db9b591b172fb2ec76a5fd5e < 9f2bfea51151dfbb24b52f452eb3d5f5fe0e506e","Linux >= 6dba940352038b56db9b591b172fb2ec76a5fd5e < 57536ff0a6bd69a5808d682925202babdb5ddc13","Linux >= 6dba940352038b56db9b591b172fb2ec76a5fd5e < b33f8d816950b10e7879cd8ffd7ae4b649ada4db","Linux >= 6dba940352038b56db9b591b172fb2ec76a5fd5e < 95d848dc7e639988dbb385a8cba9b484607cf98c","Linux 5.14"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-16T15:15:51.096773Z"},"published":"2026-05-06","updated":"2026-10-16","sourceUpdated":"2026-10-16T15:20:36.987Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-43214","references":[{"url":"https://git.kernel.org/stable/c/f621ca24f9f489e226e22560761b04884984133b"},{"url":"https://git.kernel.org/stable/c/708e20c66b2761d878a2bc3c7534e7f814e4dec5"},{"url":"https://git.kernel.org/stable/c/9f2bfea51151dfbb24b52f452eb3d5f5fe0e506e"},{"url":"https://git.kernel.org/stable/c/57536ff0a6bd69a5808d682925202babdb5ddc13"},{"url":"https://git.kernel.org/stable/c/b33f8d816950b10e7879cd8ffd7ae4b649ada4db"},{"url":"https://git.kernel.org/stable/c/95d848dc7e639988dbb385a8cba9b484607cf98c"}],"tags":["cve.org"],"epss":0.00176,"epssPercentile":0.0664,"ingestedAt":"2026-10-16T17:24:46.688Z","slug":"CVE-2026-43214","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nKVM: x86: Add SRCU protection for reading PDPTRs in __get_sregs2()\n\nAdd SRCU read-side protection when reading PDPTR registers in\n__get_sregs2().\n\nReading PDPTRs may trigger access to guest memory:\nkvm_pdptr_read() -> svm_cache_reg() -> load_pdptrs() ->\nkvm_vcpu_read_guest_page() -> kvm_vcpu_gfn_to_memslot()\n\nkvm_vcpu_gfn_to_memslot() dereferences memslots via __kvm_memslots(),\nwhich uses srcu_dereference_check() and requires either kvm->srcu or\nkvm->slots_lock to be held. Currently only vcpu->mutex is held,\ntriggering lockdep warning:\n\n=============================\nWARNING: suspicious RCU usage in kvm_vcpu_gfn_to_memslot\n6.12.59+ #3 Not tainted\n\ninclude/linux/kvm_host.h:1062 suspicious rcu_dereference_check() usage!\n\nother info that might help us debug this:\n\nrcu_scheduler_active = 2, debug_locks = 1\n1 lock held by syz.5.1717/15100:\n #0: ff1100002f4b00b0 (&vcpu->mutex){+.+.}-{3:3}, at: kvm_vcpu_ioctl+0x1d5/0x1590\n\nCall Trace:\n <TASK>\n __dump_stack lib/dump_stack.c:94 [inline]\n dump_stack_lvl+0xf0/0x120 lib/dump_stack.c:120\n lockdep_rcu_suspicious+0x1e3/0x270 kernel/locking/lockdep.c:6824\n __kvm_memslots include/linux/kvm_host.h:1062 [inline]\n __kvm_memslots include/linux/kvm_host.h:1059 [inline]\n kvm_vcpu_memslots include/linux/kvm_host.h:1076 [inline]\n kvm_vcpu_gfn_to_memslot+0x518/0x5e0 virt/kvm/kvm_main.c:2617\n kvm_vcpu_read_guest_page+0x27/0x50 virt/kvm/kvm_main.c:3302\n load_pdptrs+0xff/0x4b0 arch/x86/kvm/x86.c:1065\n svm_cache_reg+0x1c9/0x230 arch/x86/kvm/svm/svm.c:1688\n kvm_pdptr_read arch/x86/kvm/kvm_cache_regs.h:141 [inline]\n __get_sregs2 arch/x86/kvm/x86.c:11784 [inline]\n kvm_arch_vcpu_ioctl+0x3e20/0x4aa0 arch/x86/kvm/x86.c:6279\n kvm_vcpu_ioctl+0x856/0x1590 virt/kvm/kvm_main.c:4663\n vfs_ioctl fs/ioctl.c:51 [inline]\n __do_sys_ioctl fs/ioctl.c:907 [inline]\n __se_sys_ioctl fs/ioctl.c:893 [inline]\n __x64_sys_ioctl+0x18b/0x210 fs/ioctl.c:893\n do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n do_syscall_64+0xbd/0x1d0 arch/x86/entry/common.c:83\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nFound by Linux Verification Center (linuxtesting.org) with Syzkaller.\n\n## Affected\n\n- `Linux >= 6dba940352038b56db9b591b172fb2ec76a5fd5e < f621ca24f9f489e226e22560761b04884984133b`\n- `Linux >= 6dba940352038b56db9b591b172fb2ec76a5fd5e < 708e20c66b2761d878a2bc3c7534e7f814e4dec5`\n- `Linux >= 6dba940352038b56db9b591b172fb2ec76a5fd5e < 9f2bfea51151dfbb24b52f452eb3d5f5fe0e506e`\n- `Linux >= 6dba940352038b56db9b591b172fb2ec76a5fd5e < 57536ff0a6bd69a5808d682925202babdb5ddc13`\n- `Linux >= 6dba940352038b56db9b591b172fb2ec76a5fd5e < b33f8d816950b10e7879cd8ffd7ae4b649ada4db`\n- `Linux >= 6dba940352038b56db9b591b172fb2ec76a5fd5e < 95d848dc7e639988dbb385a8cba9b484607cf98c`\n- `Linux 5.14`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}