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"text":"In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: x86/mmu: Drop/zap existing present SPTE even when creating an MMIO SPTE\n\nWhen installing an emulated MMIO SPTE, do so *after* dropping/zapping the\nexisting SPTE (if it's shadow-present). While commit a54aa15c6bda3 was\nright about it being impossible to convert a shadow-present SPTE to an\nMMIO SPTE due to a _guest_ write, it failed to account for writes to guest\nmemory that are outside the scope of KVM.\n\nE.g. if host userspace modifies a shadowed gPTE to switch from a memslot\nto emulted MMIO and then the guest hits a relevant page fault, KVM will\ninstall the MMIO SPTE without first zapping the shadow-present SPTE.\n\n ------------[ cut here ]------------\n is_shadow_present_pte(*sptep)\n WARNING: arch/x86/kvm/mmu/mmu.c:484 at mark_mmio_spte+0xb2/0xc0 [kvm], CPU#0: vmx_ept_stale_r/4292\n Modules linked in: kvm_intel kvm irqbypass\n CPU: 0 UID: 1000 PID: 4292 Comm: vmx_ept_stale_r Not tainted 7.0.0-rc2-eafebd2d2ab0-sink-vm #319 PREEMPT\n Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015\n RIP: 0010:mark_mmio_spte+0xb2/0xc0 [kvm]\n Call Trace:\n \n mmu_set_spte+0x237/0x440 [kvm]\n ept_page_fault+0x535/0x7f0 [kvm]\n kvm_mmu_do_page_fault+0xee/0x1f0 [kvm]\n kvm_mmu_page_fault+0x8d/0x620 [kvm]\n vmx_handle_exit+0x18c/0x5a0 [kvm_intel]\n kvm_arch_vcpu_ioctl_run+0xc55/0x1c20 [kvm]\n kvm_vcpu_ioctl+0x2d5/0x980 [kvm]\n __x64_sys_ioctl+0x8a/0xd0\n do_syscall_64+0xb5/0x730\n entry_SYSCALL_64_after_hwframe+0x4b/0x53\n RIP: 0033:0x47fa3f\n \n ---[ end trace 0000000000000000 ]---",
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"title":"Synopsis"
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"text":"In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: x86/mmu: Drop/zap existing present SPTE even when creating an MMIO SPTE\n\nWhen installing an emulated MMIO SPTE, do so *after* dropping/zapping the\nexisting SPTE (if it's shadow-present). While commit a54aa15c6bda3 was\nright about it being impossible to convert a shadow-present SPTE to an\nMMIO SPTE due to a _guest_ write, it failed to account for writes to guest\nmemory that are outside the scope of KVM.\n\nE.g. if host userspace modifies a shadowed gPTE to switch from a memslot\nto emulted MMIO and then the guest hits a relevant page fault, KVM will\ninstall the MMIO SPTE without first zapping the shadow-present SPTE.\n\n ------------[ cut here ]------------\n is_shadow_present_pte(*sptep)\n WARNING: arch/x86/kvm/mmu/mmu.c:484 at mark_mmio_spte+0xb2/0xc0 [kvm], CPU#0: vmx_ept_stale_r/4292\n Modules linked in: kvm_intel kvm irqbypass\n CPU: 0 UID: 1000 PID: 4292 Comm: vmx_ept_stale_r Not tainted 7.0.0-rc2-eafebd2d2ab0-sink-vm #319 PREEMPT\n Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015\n RIP: 0010:mark_mmio_spte+0xb2/0xc0 [kvm]\n Call Trace:\n \n mmu_set_spte+0x237/0x440 [kvm]\n ept_page_fault+0x535/0x7f0 [kvm]\n kvm_mmu_do_page_fault+0xee/0x1f0 [kvm]\n kvm_mmu_page_fault+0x8d/0x620 [kvm]\n vmx_handle_exit+0x18c/0x5a0 [kvm_intel]\n kvm_arch_vcpu_ioctl_run+0xc55/0x1c20 [kvm]\n kvm_vcpu_ioctl+0x2d5/0x980 [kvm]\n __x64_sys_ioctl+0x8a/0xd0\n do_syscall_64+0xb5/0x730\n entry_SYSCALL_64_after_hwframe+0x4b/0x53\n RIP: 0033:0x47fa3f\n \n ---[ end trace 0000000000000000 ]---",
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"title":"Vulnerability Description"
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"vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
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"title":"CVE-2026-23401"
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