CVE-2026-64307

{"id": "CVE-2026-64307", "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}]}, "affected": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "affectedData": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "1c3506ea8599a3ad1b9aae5cbd573134f8d18db7", "lessThan": "345a6e869b33687e9268044bcaeeefd7c61da675", "versionType": "git"}, {"status": "affected", "version": "ceac7fb89e8da465aec3ac3c20477f912f5c3a6c", "lessThan": "441ea32cf2755a0dc593557056b00b7caa0651f5", "versionType": "git"}, {"status": "affected", "version": "ceac7fb89e8da465aec3ac3c20477f912f5c3a6c", "lessThan": "20f548cdac94860a164e5ebba4f7e4a01051cb06", "versionType": "git"}, {"status": "affected", "version": "ceac7fb89e8da465aec3ac3c20477f912f5c3a6c", "lessThan": "08f0e65e784c4b20e6e620dd4f68d8636073a3d2", "versionType": "git"}, {"status": "affected", "version": "6.12.75", "lessThan": "6.12.97", "versionType": "semver"}], "programFiles": ["drivers/crypto/ccp/sev-dev.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "6.16"}, {"status": "unaffected", "version": "0", "lessThan": "6.16", "versionType": "semver"}, {"status": "unaffected", "version": "6.12.97", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.39", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.1.4", "versionType": "semver", "lessThanOrEqual": "7.1.*"}, {"status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["drivers/crypto/ccp/sev-dev.c"], "defaultStatus": "affected"}]}], "published": "2026-07-25T10:17:11.800", "references": [{"url": "https://git.kernel.org/stable/c/08f0e65e784c4b20e6e620dd4f68d8636073a3d2", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/20f548cdac94860a164e5ebba4f7e4a01051cb06", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/345a6e869b33687e9268044bcaeeefd7c61da675", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/441ea32cf2755a0dc593557056b00b7caa0651f5", "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\ncrypto: ccp - Do not initialize SNP for ioctl(SNP_CONFIG)\n\nSashiko notes:\n\n> if SEV initialization fails and KVM is actively running normal VMs, could a\n> userspace process trigger this code path via /dev/sev ioctls (e.g.,\n> SEV_PDH_GEN) and zero out MSR_VM_HSAVE_PA globally? 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"}], "lastModified": "2026-10-24T13:10:00.147", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "ADEED594-2788-4BF2-B514-7C2CC3CA9228", "versionEndExcluding": "6.12.97", "versionStartIncluding": "6.12.75"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "FFBD7467-7FB0-4538-9CC0-98199E9EC402", "versionEndExcluding": "6.18.39", "versionStartIncluding": "6.16"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "6228DDD6-4557-4AA3-9F43-AB995D471E42", "versionEndExcluding": "7.1.4", "versionStartIncluding": "6.19"}], "operator": "OR"}]}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}