CVE-2026-64308

{"id": "CVE-2026-64308", "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": "61cf5eef20657bff9ca235fe938a99ce5ff65c06", "versionType": "git"}, {"status": "affected", "version": "ceac7fb89e8da465aec3ac3c20477f912f5c3a6c", "lessThan": "92567ed9306d5a3d1b007eb4faeff30cc3ffc3e4", "versionType": "git"}, {"status": "affected", "version": "ceac7fb89e8da465aec3ac3c20477f912f5c3a6c", "lessThan": "8836801847b9479ac046cb18a24981e1b0b05e9d", "versionType": "git"}, {"status": "affected", "version": "ceac7fb89e8da465aec3ac3c20477f912f5c3a6c", "lessThan": "f91e9dbb5845d1e5abf1028e6df57dcf61583e1b", "versionType": "git"}, {"status": "affected", "version": "6.12.75", "lessThan": "6.12.96", "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": "6.12.96", "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": "2026-07-25T10:17:11.917", "references": [{"url": "https://git.kernel.org/stable/c/61cf5eef20657bff9ca235fe938a99ce5ff65c06", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/8836801847b9479ac046cb18a24981e1b0b05e9d", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/92567ed9306d5a3d1b007eb4faeff30cc3ffc3e4", "tags": ["Patch"], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/f91e9dbb5845d1e5abf1028e6df57dcf61583e1b", "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_VLEK_LOAD)\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\nThe SEV firmware docs for SNP_VLEK_LOAD note:\n\n> On SNP_SHUTDOWN, the VLEK is deleted.\n\nThat is, the initialization/shutdown wrapper here is pointless, because the\nfirmware immediately throws away the key anyway. Instead, refuse to do\nanything if SNP has not been previously initialized.\n\nThis is an ABI break: before, this was a no-op and almost certainly a\nmistake by userspace, and now it returns -ENODEV. ABI compatibility could be\nmaintained here by simply returning 0 in the check instead."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\ncrypto: ccp - No inicializar SNP para ioctl(SNP_VLEK_LOAD)\n\nSashiko se\u00f1ala:\n\n> si la inicializaci\u00f3n de SEV falla y KVM est\u00e1 ejecutando activamente m\u00e1quinas virtuales normales, \u00bfpodr\u00eda un\n> proceso de espacio de usuario activar esta ruta de c\u00f3digo a trav\u00e9s de ioctls de /dev/sev (por ejemplo,\n> SEV_PDH_GEN) y poner a cero MSR_VM_HSAVE_PA globalmente? \u00bfLa siguiente ejecuci\u00f3n de VMRUN\n> para una m\u00e1quina virtual activa activar\u00eda una falla de protecci\u00f3n general y bloquear\u00eda el\n> anfitri\u00f3n?\n\nLa documentaci\u00f3n del firmware de SEV para SNP_VLEK_LOAD se\u00f1ala:\n\n> En SNP_SHUTDOWN, el VLEK es eliminado.\n\nEs decir, el envoltorio de inicializaci\u00f3n/apagado aqu\u00ed es in\u00fatil, porque el\nfirmware desecha inmediatamente la clave de todos modos. En su lugar, negarse a hacer\nnada si SNP no ha sido inicializado previamente.\n\nEsto es una ruptura de ABI: antes, esto era una operaci\u00f3n nula y casi con certeza un\nerror del espacio de usuario, y ahora devuelve -ENODEV. La compatibilidad ABI podr\u00eda ser\nmantenida aqu\u00ed simplemente devolviendo 0 en la verificaci\u00f3n en su lugar."}], "lastModified": "2026-10-24T13:10:00.147", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "0C1E3642-D5B1-428A-9CC8-2B6059DEA06A", "versionEndExcluding": "6.12.96", "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"}