{"id":"CVE-2026-64308","state":"PUBLISHED","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.","publishedAt":"2026-07-25T08:49:41.411Z","updatedAt":"2026-08-17T04:53:07.657Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"1c3506ea8599a3ad1b9aae5cbd573134f8d18db7","status":"affected","lessThan":"61cf5eef20657bff9ca235fe938a99ce5ff65c06","versionType":"git"},{"version":"ceac7fb89e8da465aec3ac3c20477f912f5c3a6c","status":"affected","lessThan":"92567ed9306d5a3d1b007eb4faeff30cc3ffc3e4","versionType":"git"},{"version":"ceac7fb89e8da465aec3ac3c20477f912f5c3a6c","status":"affected","lessThan":"8836801847b9479ac046cb18a24981e1b0b05e9d","versionType":"git"},{"version":"ceac7fb89e8da465aec3ac3c20477f912f5c3a6c","status":"affected","lessThan":"f91e9dbb5845d1e5abf1028e6df57dcf61583e1b","versionType":"git"},{"version":"6.12.75","status":"affected","lessThan":"6.12.96","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/crypto/ccp/sev-dev.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.16","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.16","versionType":"semver"},{"version":"6.12.96","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.39","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.4","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/crypto/ccp/sev-dev.c"]}],"references":["https://git.kernel.org/stable/c/61cf5eef20657bff9ca235fe938a99ce5ff65c06","https://git.kernel.org/stable/c/92567ed9306d5a3d1b007eb4faeff30cc3ffc3e4","https://git.kernel.org/stable/c/8836801847b9479ac046cb18a24981e1b0b05e9d","https://git.kernel.org/stable/c/f91e9dbb5845d1e5abf1028e6df57dcf61583e1b"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:41.951Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/64xxx/CVE-2026-64308.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-64308","state":"PUBLISHED","datePublished":"2026-07-25T08:49:41.411Z","dateUpdated":"2026-08-17T04:53:07.657Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-07-19T15:36:31.779Z"},"containers":{"cna":{"title":"crypto: ccp - Do not initialize SNP for ioctl(SNP_VLEK_LOAD)","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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"1c3506ea8599a3ad1b9aae5cbd573134f8d18db7","status":"affected","lessThan":"61cf5eef20657bff9ca235fe938a99ce5ff65c06","versionType":"git"},{"version":"ceac7fb89e8da465aec3ac3c20477f912f5c3a6c","status":"affected","lessThan":"92567ed9306d5a3d1b007eb4faeff30cc3ffc3e4","versionType":"git"},{"version":"ceac7fb89e8da465aec3ac3c20477f912f5c3a6c","status":"affected","lessThan":"8836801847b9479ac046cb18a24981e1b0b05e9d","versionType":"git"},{"version":"ceac7fb89e8da465aec3ac3c20477f912f5c3a6c","status":"affected","lessThan":"f91e9dbb5845d1e5abf1028e6df57dcf61583e1b","versionType":"git"},{"version":"6.12.75","status":"affected","lessThan":"6.12.96","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/crypto/ccp/sev-dev.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.16","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.16","versionType":"semver"},{"version":"6.12.96","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.39","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.4","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/crypto/ccp/sev-dev.c"]}],"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"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-17T04:53:07.657Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.12.75","versionEndExcluding":"6.12.96"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.16","versionEndExcluding":"6.18.39"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.16","versionEndExcluding":"7.1.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.16","versionEndExcluding":"7.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}