{"api_version":"1","generated_at":"2026-07-26T00:28:16+00:00","cve":"CVE-2026-64308","urls":{"html":"https://cve.report/CVE-2026-64308","api":"https://cve.report/api/cve/CVE-2026-64308.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-64308","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-64308"},"summary":{"title":"crypto: ccp - Do not initialize SNP for ioctl(SNP_VLEK_LOAD)","description":"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.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-07-25 10:17:11","updated_at":"2026-07-25 10:17:11"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/f91e9dbb5845d1e5abf1028e6df57dcf61583e1b","name":"https://git.kernel.org/stable/c/f91e9dbb5845d1e5abf1028e6df57dcf61583e1b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/61cf5eef20657bff9ca235fe938a99ce5ff65c06","name":"https://git.kernel.org/stable/c/61cf5eef20657bff9ca235fe938a99ce5ff65c06","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/8836801847b9479ac046cb18a24981e1b0b05e9d","name":"https://git.kernel.org/stable/c/8836801847b9479ac046cb18a24981e1b0b05e9d","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/92567ed9306d5a3d1b007eb4faeff30cc3ffc3e4","name":"https://git.kernel.org/stable/c/92567ed9306d5a3d1b007eb4faeff30cc3ffc3e4","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-64308","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64308","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1c3506ea8599a3ad1b9aae5cbd573134f8d18db7 61cf5eef20657bff9ca235fe938a99ce5ff65c06 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected ceac7fb89e8da465aec3ac3c20477f912f5c3a6c 92567ed9306d5a3d1b007eb4faeff30cc3ffc3e4 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected ceac7fb89e8da465aec3ac3c20477f912f5c3a6c 8836801847b9479ac046cb18a24981e1b0b05e9d git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected ceac7fb89e8da465aec3ac3c20477f912f5c3a6c f91e9dbb5845d1e5abf1028e6df57dcf61583e1b git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.12.75 6.12.96 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.16","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.16 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.96 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.39 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.4 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2-rc1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"64308","cve":"CVE-2026-64308","epss":"0.002250000","percentile":"0.132610000","score_date":"2026-07-25","updated_at":"2026-07-26 00:12:33"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["drivers/crypto/ccp/sev-dev.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"61cf5eef20657bff9ca235fe938a99ce5ff65c06","status":"affected","version":"1c3506ea8599a3ad1b9aae5cbd573134f8d18db7","versionType":"git"},{"lessThan":"92567ed9306d5a3d1b007eb4faeff30cc3ffc3e4","status":"affected","version":"ceac7fb89e8da465aec3ac3c20477f912f5c3a6c","versionType":"git"},{"lessThan":"8836801847b9479ac046cb18a24981e1b0b05e9d","status":"affected","version":"ceac7fb89e8da465aec3ac3c20477f912f5c3a6c","versionType":"git"},{"lessThan":"f91e9dbb5845d1e5abf1028e6df57dcf61583e1b","status":"affected","version":"ceac7fb89e8da465aec3ac3c20477f912f5c3a6c","versionType":"git"},{"lessThan":"6.12.96","status":"affected","version":"6.12.75","versionType":"semver"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/crypto/ccp/sev-dev.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.16"},{"lessThan":"6.16","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.96","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.39","versionType":"semver"},{"lessThanOrEqual":"7.1.*","status":"unaffected","version":"7.1.4","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.2-rc1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.96","versionStartIncluding":"6.12.75","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.39","versionStartIncluding":"6.16","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.4","versionStartIncluding":"6.16","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2-rc1","versionStartIncluding":"6.16","vulnerable":true}],"negate":false,"operator":"OR"}]}],"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."}],"providerMetadata":{"dateUpdated":"2026-07-25T08:49:41.411Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/61cf5eef20657bff9ca235fe938a99ce5ff65c06"},{"url":"https://git.kernel.org/stable/c/92567ed9306d5a3d1b007eb4faeff30cc3ffc3e4"},{"url":"https://git.kernel.org/stable/c/8836801847b9479ac046cb18a24981e1b0b05e9d"},{"url":"https://git.kernel.org/stable/c/f91e9dbb5845d1e5abf1028e6df57dcf61583e1b"}],"title":"crypto: ccp - Do not initialize SNP for ioctl(SNP_VLEK_LOAD)","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-64308","datePublished":"2026-07-25T08:49:41.411Z","dateReserved":"2026-07-19T15:36:31.779Z","dateUpdated":"2026-07-25T08:49:41.411Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-07-25 10:17:11","lastModifiedDate":"2026-07-25 10:17:11","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"64308","Ordinal":"1","Title":"crypto: ccp - Do not initialize SNP for ioctl(SNP_VLEK_LOAD)","CVE":"CVE-2026-64308","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"64308","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"crypto: ccp - Do not initialize SNP for ioctl(SNP_VLEK_LOAD)"}]}}}