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CVE-2026-43315: Linux

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CVSS

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Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)

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Атакува се

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Време до експлоатация

    Описание

    Оригинално описание

    In the Linux kernel, the following vulnerability has been resolved: KVM: nSVM: Remove a user-triggerable WARN on nested_svm_load_cr3() succeeding Drop the WARN in svm_set_nested_state() on nested_svm_load_cr3() failing as it is trivially easy to trigger from userspace by modifying CPUID after loading CR3. E.g. modifying the state restoration selftest like so: --- tools/testing/selftests/kvm/x86/state_test.c +++ tools/testing/selftests/kvm/x86/state_test.c @@ -280,7 +280,16 @@ int main(int argc, char *argv[]) /* Restore state in a new VM. */ vcpu = vm_recreate_with_one_vcpu(vm); - vcpu_load_state(vcpu, state); + + if (stage == 4) { + state->sregs.cr3 = BIT(44); + vcpu_load_state(vcpu, state); + + vcpu_set_cpuid_property(vcpu, X86_PROPERTY_MAX_PHY_ADDR, 36); + __vcpu_nested_state_set(vcpu, &state->nested); + } else { + vcpu_load_state(vcpu, state); + } /* * Restore XSAVE state in a dummy vCPU, first without doing generates: WARNING: CPU: 30 PID: 938 at arch/x86/kvm/svm/nested.c:1877 svm_set_nested_state+0x34a/0x360 [kvm_amd] Modules linked in: kvm_amd kvm irqbypass [last unloaded: kvm] CPU: 30 UID: 1000 PID: 938 Comm: state_test Tainted: G W 6.18.0-rc7-58e10b63777d-next-vm Tainted: [W]=WARN Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015 RIP: 0010:svm_set_nested_state+0x34a/0x360 [kvm_amd] Call Trace: <TASK> kvm_arch_vcpu_ioctl+0xf33/0x1700 [kvm] kvm_vcpu_ioctl+0x4e6/0x8f0 [kvm] __x64_sys_ioctl+0x8f/0xd0 do_syscall_64+0x61/0xad0 entry_SYSCALL_64_after_hwframe+0x4b/0x53 Simply delete the WARN instead of trying to prevent userspace from shoving "illegal" state into CR3. For better or worse, KVM's ABI allows userspace to set

    Засегнати продукти

    • Linux Linux: b222b0b88162bdef4eceb12a79d5edbbdb23dbfd преди 155ec243ef726f4bc49536fa0bfb565dc011ab17; b222b0b88162bdef4eceb12a79d5edbbdb23dbfd преди 580ea57840864d40e019bc13fd26afdc8d510a2f; b222b0b88162bdef4eceb12a79d5edbbdb23dbfd преди deb8f6dfd31d94b18dbeeaa8c01fbec5fc70fd2b; b222b0b88162bdef4eceb12a79d5edbbdb23dbfd преди ce904c8a5bbe697eae0f7e34b07095bd7a6dee19; b222b0b88162bdef4eceb12a79d5edbbdb23dbfd преди 969e5e13ff5c18603f21d1f9f64ec9194e141ac0; b222b0b88162bdef4eceb12a79d5edbbdb23dbfd преди ebb2ab4f1c87d6b52776292cf7dc16aea48e95f8; b222b0b88162bdef4eceb12a79d5edbbdb23dbfd преди fc3ba56385d03501eb582e4b86691ba378e556f9
    • Linux Linux: 5.14; преди 5.14; 5.15.202 до 5.15.*; 6.1.165 до 6.1.*; 6.6.128 до 6.6.*; 6.12.75 до 6.12.*; 6.18.16 до 6.18.*; 6.19.6 до 6.19.*; от 7.0 нататък

    История

    • 8 май 2026 Публикувано

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    CVE-2026-43315: Linux | freedomonline.bg