CVE-2022-50224

{"id": "CVE-2022-50224", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.5, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 1.8}]}, "published": "2025-06-18T11:15:53.410", "references": [{"url": "https://git.kernel.org/stable/c/6271f2854b9233702e236e576b885a876dde4889", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/6c6ab524cfae0799e55c82b2c1d61f1af0156f8d", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "nvd@nist.gov", "description": [{"lang": "en", "value": "NVD-CWE-noinfo"}]}], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: x86/mmu: Treat NX as a valid SPTE bit for NPT\n\nTreat the NX bit as valid when using NPT, as KVM will set the NX bit when\nthe NX huge page mitigation is enabled (mindblowing) and trigger the WARN\nthat fires on reserved SPTE bits being set.\n\nKVM has required NX support for SVM since commit b26a71a1a5b9 (\"KVM: SVM:\nRefuse to load kvm_amd if NX support is not available\") for exactly this\nreason, but apparently it never occurred to anyone to actually test NPT\nwith the mitigation enabled.\n\n ------------[ cut here ]------------\n spte = 0x800000018a600ee7, level = 2, rsvd bits = 0x800f0000001fe000\n WARNING: CPU: 152 PID: 15966 at arch/x86/kvm/mmu/spte.c:215 make_spte+0x327/0x340 [kvm]\n Hardware name: Google, Inc. Arcadia_IT_80/Arcadia_IT_80, BIOS 10.48.0 01/27/2022\n RIP: 0010:make_spte+0x327/0x340 [kvm]\n Call Trace:\n <TASK>\n tdp_mmu_map_handle_target_level+0xc3/0x230 [kvm]\n kvm_tdp_mmu_map+0x343/0x3b0 [kvm]\n direct_page_fault+0x1ae/0x2a0 [kvm]\n kvm_tdp_page_fault+0x7d/0x90 [kvm]\n kvm_mmu_page_fault+0xfb/0x2e0 [kvm]\n npf_interception+0x55/0x90 [kvm_amd]\n svm_invoke_exit_handler+0x31/0xf0 [kvm_amd]\n svm_handle_exit+0xf6/0x1d0 [kvm_amd]\n vcpu_enter_guest+0xb6d/0xee0 [kvm]\n ? kvm_pmu_trigger_event+0x6d/0x230 [kvm]\n vcpu_run+0x65/0x2c0 [kvm]\n kvm_arch_vcpu_ioctl_run+0x355/0x610 [kvm]\n kvm_vcpu_ioctl+0x551/0x610 [kvm]\n __se_sys_ioctl+0x77/0xc0\n __x64_sys_ioctl+0x1d/0x20\n do_syscall_64+0x44/0xa0\n entry_SYSCALL_64_after_hwframe+0x46/0xb0\n </TASK>\n ---[ end trace 0000000000000000 ]---"}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: KVM: x86/mmu: Tratar NX como un bit SPTE v\u00e1lido para NPT. Se trata el bit NX como v\u00e1lido al usar NPT, ya que KVM lo activar\u00e1 cuando la mitigaci\u00f3n de p\u00e1ginas enormes de NX est\u00e9 habilitada (\u00a1incre\u00edble!) y activar\u00e1 la advertencia que se activa al activarse los bits SPTE reservados. KVM ha requerido compatibilidad con NX para SVM desde el commit b26a71a1a5b9 (\"KVM: SVM: Rechazar la carga de kvm_amd si la compatibilidad con NX no est\u00e1 disponible\") precisamente por esta raz\u00f3n, pero aparentemente a nadie se le ocurri\u00f3 probar NPT con la mitigaci\u00f3n habilitada. ------------[ cortar aqu\u00ed ]------------ spte = 0x800000018a600ee7, nivel = 2, bits rsvd = 0x800f0000001fe000 ADVERTENCIA: CPU: 152 PID: 15966 en arch/x86/kvm/mmu/spte.c:215 make_spte+0x327/0x340 [kvm] Nombre del hardware: Google, Inc. Arcadia_IT_80/Arcadia_IT_80, BIOS 10.48.0 27/01/2022 RIP: 0010:make_spte+0x327/0x340 [kvm] Rastreo de llamadas: tdp_mmu_map_handle_target_level+0xc3/0x230 [kvm] kvm_tdp_mmu_map+0x343/0x3b0 [kvm] direct_page_fault+0x1ae/0x2a0 [kvm] kvm_tdp_page_fault+0x7d/0x90 [kvm] kvm_mmu_page_fault+0xfb/0x2e0 [kvm] npf_interception+0x55/0x90 [kvm_amd] svm_invoke_exit_handler+0x31/0xf0 [kvm_amd] svm_handle_exit+0xf6/0x1d0 [kvm_amd] vcpu_enter_guest+0xb6d/0xee0 [kvm] ? kvm_pmu_trigger_event+0x6d/0x230 [kvm] vcpu_run+0x65/0x2c0 [kvm] kvm_arch_vcpu_ioctl_run+0x355/0x610 [kvm] kvm_vcpu_ioctl+0x551/0x610 [kvm] __se_sys_ioctl+0x77/0xc0 __x64_sys_ioctl+0x1d/0x20 do_syscall_64+0x44/0xa0 entry_SYSCALL_64_after_hwframe+0x46/0xb0 ---[ fin de seguimiento 0000000000000000 ]---"}], "lastModified": "2025-11-19T12:58:27.033", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "15D2C268-DDDE-47F4-84C9-F08736D6047A", "versionEndExcluding": "4.10", "versionStartIncluding": "4.9.202"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "344FEFB4-E393-4E04-905A-4734AC267EC1", "versionEndExcluding": "4.15", "versionStartIncluding": "4.14.154"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "B7EACEB9-7173-47F4-83A4-AE06CE74D78B", "versionEndExcluding": "4.20", "versionStartIncluding": "4.19.84"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "2C477253-CAE4-47C3-A62D-F5EC4455A1CD", "versionEndExcluding": "5.4", "versionStartIncluding": "5.3.11"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "8FF8A7C0-7DA3-4C1C-A8ED-E8658CD33449", "versionEndExcluding": "5.19.2", "versionStartIncluding": "5.4.1"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.4:-:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "4D70AB13-37BE-4BD3-A652-10191F1642E4"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:5.4:rc8:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "D980DAA0-07F8-4C47-B178-0BDDDA234A06"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}