{"id":"CVE-2026-43214","revision":"0e6227f7dcff424b8e9ce6f600e427e8","records":[{"revision":"0e6227f7dcff424b8e9ce6f600e427e8","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-43214","aliases":[],"title":"KVM: x86: Add SRCU protection for reading PDPTRs in __get_sregs2()","description":"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 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.","state":0,"publishedAt":"2026-05-06T11:28:16.766+00:00","modifiedAt":"2026-10-19T19:16:24.58+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"arch/x86/kvm/x86.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"6dba940352038b56db9b591b172fb2ec76a5fd5e\",\n                            \"lessThan\": \"f621ca24f9f489e226e22560761b04884984133b\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"6dba940352038b56db9b591b172fb2ec76a5fd5e\",\n                            \"lessThan\": \"708e20c66b2761d878a2bc3c7534e7f814e4dec5\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"6dba940352038b56db9b591b172fb2ec76a5fd5e\",\n                            \"lessThan\": \"9f2bfea51151dfbb24b52f452eb3d5f5fe0e506e\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"6dba940352038b56db9b591b172fb2ec76a5fd5e\",\n                            \"lessThan\": \"57536ff0a6bd69a5808d682925202babdb5ddc13\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"6dba940352038b56db9b591b172fb2ec76a5fd5e\",\n                            \"lessThan\": \"b33f8d816950b10e7879cd8ffd7ae4b649ada4db\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"6dba940352038b56db9b591b172fb2ec76a5fd5e\",\n                            \"lessThan\": \"95d848dc7e639988dbb385a8cba9b484607cf98c\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"arch/x86/kvm/x86.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"5.14\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"5.14\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.165\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.128\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.75\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.16\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.19.6\",\n                            \"lessThanOrEqual\": \"6.19.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.0\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/f621ca24f9f489e226e22560761b04884984133b","https://git.kernel.org/stable/c/708e20c66b2761d878a2bc3c7534e7f814e4dec5","https://git.kernel.org/stable/c/9f2bfea51151dfbb24b52f452eb3d5f5fe0e506e","https://git.kernel.org/stable/c/57536ff0a6bd69a5808d682925202babdb5ddc13","https://git.kernel.org/stable/c/b33f8d816950b10e7879cd8ffd7ae4b649ada4db","https://git.kernel.org/stable/c/95d848dc7e639988dbb385a8cba9b484607cf98c"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-43214","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-43214","identifiers":["CVE-2026-43214"]},"retained":false,"historicalAffected":[]}],"coverage":[]}