CVE-2026-64307

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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\nRefuse to re-try initialization if SNP is not already initialized for\nSNP_CONFIG.\n\nThis is technically an ABI break: before if SNP initialization failed it\ncould be transparently retriggered by this ioctl, and if no VMs were\nrunning, everything worked fine. Hopefully this is enough of a corner case\nthat nobody will notice, but someone does, there are a few options:\n\n* do something like symbol_get() for kvm and refuse to initialize if KVM is\n loaded\n* check each cpu's HSAVE_PA for non-zero data before re-initializing\n* once initialization has failed, continue to refuse to initialize until\n the ccp module is unloaded"}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ncrypto: ccp - No inicializar SNP para ioctl(SNP_CONFIG)\n\nNotas de Sashiko:\n\n> si la inicializaci\u00f3n de SEV falla y KVM est\u00e1 ejecutando activamente m\u00e1quinas virtuales 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 m\u00e1quina virtual activa desencadenar\u00eda una falla de protecci\u00f3n general y bloquear\u00eda el host?\n\nRechazar reintentar la inicializaci\u00f3n si SNP no est\u00e1 ya inicializado para SNP_CONFIG.\n\nEsto es t\u00e9cnicamente una ruptura de ABI: antes, si la inicializaci\u00f3n de SNP fallaba, pod\u00eda ser re-activada transparentemente por este ioctl, y si no hab\u00eda m\u00e1quinas virtuales en ejecuci\u00f3n, todo funcionaba bien. Con suerte, este es un caso tan excepcional que nadie lo notar\u00e1, pero si alguien lo hace, hay algunas opciones:\n\n* hacer algo como symbol_get() para kvm y negarse a inicializar si KVM est\u00e1 cargado\n* verificar el HSAVE_PA de cada CPU en busca de datos no nulos antes de reinicializar\n* una vez que la inicializaci\u00f3n ha fallado, continuar neg\u00e1ndose a inicializar hasta que el m\u00f3dulo ccp sea descargado"}], "id": "CVE-2026-64307", "lastModified": "2026-11-06T17:18:46.863", "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-2026-64307", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-06T16:34:35.438688Z", "version": "2.0.3"}}]}, "published": "2026-07-25T10:17:11.800", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/08f0e65e784c4b20e6e620dd4f68d8636073a3d2"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/20f548cdac94860a164e5ebba4f7e4a01051cb06"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/345a6e869b33687e9268044bcaeeefd7c61da675"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/441ea32cf2755a0dc593557056b00b7caa0651f5"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: crypto: ccp - Do not initialize SNP for ioctl(SNP_CONFIG)", "id": "2507090", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2507090"}, "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-455", "details": ["A flaw was found in the Linux kernel's crypto:ccp module. A local attacker with access to a userspace process could exploit this vulnerability. If Secure Encrypted Virtualization (SEV) initialization fails while Kernel-based Virtual Machine (KVM) is running virtual machines, the attacker can trigger a specific code path through `/dev/sev` input/output controls (ioctls). This can cause a system crash, leading to a Denial of Service (DoS) for the host."], "name": "CVE-2026-64307", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "impact": "moderate", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "impact": "moderate", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "impact": "moderate", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "impact": "moderate", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "impact": "moderate", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "impact": "moderate", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "impact": "moderate", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "impact": "moderate", "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-2026-64307\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-64307\nhttps://lore.kernel.org/linux-cve-announce/2026072508-CVE-2026-64307-2673@gregkh/T"], "threat_severity": "Moderate"}

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