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CVE-2026-99176: Linux

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CVSS

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Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)

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    Описание

    Оригинално описание

    In the Linux kernel, the following vulnerability has been resolved: KVM: nVMX: Reset MMU back to the root MMU if loading L2 state fails for !VM-Entry Reset the vCPU's MMU pointer back to the root MMU if loading L2 state fails in the "not from VM-Entry" case, i.e. when emulating RSM or handling KVM_SET_NESTED_STATE. Failure to unwind the MMU pointer results in KVM trying to run L1 with a nested MMU, and is especially problematic if the vCPU manages to free its nested state before the VM crashes. Constructing the root for a nested EPT MMU goes through vmcs12, which is dynamically allocated/freed when nVMX is enabled/disabled. And so if the nested state is freed with the MMU still pointing at the nested MMU, KVM will hit a NULL pointer deref when attempting to get L1=>L2 EPTP. BUG: kernel NULL pointer dereference, address: 0000000000000078 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 114a2d067 P4D 111743067 PUD 11141f067 PMD 0 Oops: Oops: 0000 [#1] SMP CPU: 20 UID: 1000 PID: 1272 Comm: nested_tdp_faul Not tainted 7.3.0-rc4-8c89f11d1a99b-sink-vm #1914 PREEMPTLAZY Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015 RIP: 0010:nested_ept_get_eptp+0xb/0x10 [kvm_intel] Call Trace: <TASK> kvm_mmu_load+0xcd/0x870 [kvm] kvm_arch_vcpu_ioctl_run+0x18f5/0x1f80 [kvm] kvm_vcpu_ioctl+0x2c7/0x970 [kvm] __x64_sys_ioctl+0x90/0xd0 do_syscall_64+0x9c/0x4d0 entry_SYSCALL_64_after_hwframe+0x4b/0x53 RIP: 0033:0x47491b </TASK> Modules linked in: kvm_intel kvm irqbypass CR2: 0000000000000078 ---[ end trace 0000000000000000 ]--- RIP: 0010:nested_ept_get_eptp+0xb/0x10 [kvm_intel] [sean: write changelog]

    Засегнати продукти

    • Linux Linux: 72e9cbdb43384ceacc49e2fb6b8c8fb7c5988778 преди c2586874605ec23b611c57fe71d183d98f168971; 72e9cbdb43384ceacc49e2fb6b8c8fb7c5988778 преди c611337aee17a0627e365e58e2b6e78803fb3c36; 72e9cbdb43384ceacc49e2fb6b8c8fb7c5988778 преди df4d01be5b318024bec68654c7af0ebc0e0ed8a1; 72e9cbdb43384ceacc49e2fb6b8c8fb7c5988778 преди 6a36b05fc5b3d660fcc826133dc92e2fc87bd1de; 72e9cbdb43384ceacc49e2fb6b8c8fb7c5988778 преди f0c077c36fda9d498db39199e3997860e985efc8; 72e9cbdb43384ceacc49e2fb6b8c8fb7c5988778 преди d00d5f534a8238674755e59826a6c7d3c8efb870; 72e9cbdb43384ceacc49e2fb6b8c8fb7c5988778 преди c9716f956216eb74ab0aad7f633586edd49e0322; 72e9cbdb43384ceacc49e2fb6b8c8fb7c5988778 преди c8f4cfe1cf93bce924e27f2abead7a4c4a487505
    • Linux Linux: 4.15; преди 4.15; 5.10.273 до 5.10.*; 5.15.224 до 5.15.*; 6.1.191 до 6.1.*; 6.6.161 до 6.6.*; 6.12.115 до 6.12.*; 6.18.59 до 6.18.*; 7.2.13 до 7.2.*; 7.3 до *

    История

    • 28 октомври 2026 Публикувано

    Други уязвимости в Linux Linux

    Първоизточници

    CVE-2026-99176: Linux | freedomonline.bg