CVE-2026-64309

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Would the next VMRUN\n> execution for an active VM trigger a general protection fault and crash the\n> host?\n\nThe SNP_COMMIT command does not require the firmware to be in any\nparticular state. Skip initializing it if it was previously uninitialized.\n\nThe SEV-SNP firmware specification doc 56860 does not mention SNP_COMMIT in\nTable 5 as a command that is allowed in the UNINIT state, but it is in fact\nallowed and a future documentation update will reflect that."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ncrypto: ccp - No inicializar SNP para ioctl(SNP_COMMIT)\n\nNotas de Sashiko:\n\n> si la inicializaci\u00f3n de SEV falla y KVM est\u00e1 ejecutando activamente VMs normales, \u00bfpodr\u00eda un proceso de espacio de usuario activar esta ruta de c\u00f3digo a trav\u00e9s de ioctls de /dev/sev (p. ej., SEV_PDH_GEN) y poner a cero MSR_VM_HSAVE_PA globalmente? \u00bfLa siguiente ejecuci\u00f3n de VMRUN para una VM activa activar\u00eda una falla de protecci\u00f3n general y colapsar\u00eda el host?\n\nEl comando SNP_COMMIT no requiere que el firmware est\u00e9 en ning\u00fan estado particular. Omitir su inicializaci\u00f3n si estaba previamente sin inicializar.\n\nEl documento de especificaci\u00f3n del firmware SEV-SNP 56860 no menciona SNP_COMMIT en la Tabla 5 como un comando permitido en el estado UNINIT, pero de hecho est\u00e1 permitido y una futura actualizaci\u00f3n de la documentaci\u00f3n lo reflejar\u00e1."}], "id": "CVE-2026-64309", "lastModified": "2026-11-06T17:18:47.187", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-64309", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-06T16:34:44.190905Z", "version": "2.0.3"}}]}, "published": "2026-07-25T10:17:12.030", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5a1364da2f04217a36e2fdfa2db4ee025b383a20"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/67ed191b4c8bdf432a3f32d1eb302880b4795cd1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/74768f73854d647a6462f252dc8782ab8a835211"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/7a361c74bb12f3398c388905f1d325be642cd36e"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-908"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: crypto: ccp - Do not initialize SNP for ioctl(SNP_COMMIT)", "id": "2507280", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2507280"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-908", "details": ["A flaw was found in the Linux kernel's `crypto: ccp` module. This vulnerability arises from improper initialization of Secure Nested Paging (SNP) when handling the `ioctl(SNP_COMMIT)` command. A local userspace process can exploit this by sending specific commands via `/dev/sev` ioctls. If Secure Encrypted Virtualization (SEV) initialization fails and Kernel-based Virtual Machine (KVM) is actively running virtual machines, this flaw could lead to a Denial of Service (DoS) by causing a host crash."], "name": "CVE-2026-64309", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-07-25T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-64309\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-64309\nhttps://lore.kernel.org/linux-cve-announce/2026072508-CVE-2026-64309-77b5@gregkh/T"], "threat_severity": "Moderate"}

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