{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-64307","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-07-19T15:36:31.779Z","datePublished":"2026-07-25T08:49:40.782Z","dateUpdated":"2026-08-17T04:53:06.569Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-17T04:53:06.569Z"},"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"}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/crypto/ccp/sev-dev.c"],"versions":[{"version":"1c3506ea8599a3ad1b9aae5cbd573134f8d18db7","lessThan":"345a6e869b33687e9268044bcaeeefd7c61da675","status":"affected","versionType":"git"},{"version":"ceac7fb89e8da465aec3ac3c20477f912f5c3a6c","lessThan":"441ea32cf2755a0dc593557056b00b7caa0651f5","status":"affected","versionType":"git"},{"version":"ceac7fb89e8da465aec3ac3c20477f912f5c3a6c","lessThan":"20f548cdac94860a164e5ebba4f7e4a01051cb06","status":"affected","versionType":"git"},{"version":"ceac7fb89e8da465aec3ac3c20477f912f5c3a6c","lessThan":"08f0e65e784c4b20e6e620dd4f68d8636073a3d2","status":"affected","versionType":"git"},{"version":"6.12.75","lessThan":"6.12.97","status":"affected","versionType":"semver"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/crypto/ccp/sev-dev.c"],"versions":[{"version":"6.16","status":"affected"},{"version":"0","lessThan":"6.16","status":"unaffected","versionType":"semver"},{"version":"6.12.97","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.39","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.1.4","lessThanOrEqual":"7.1.*","status":"unaffected","versionType":"semver"},{"version":"7.2","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.12.75","versionEndExcluding":"6.12.97"},{"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"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/345a6e869b33687e9268044bcaeeefd7c61da675"},{"url":"https://git.kernel.org/stable/c/441ea32cf2755a0dc593557056b00b7caa0651f5"},{"url":"https://git.kernel.org/stable/c/20f548cdac94860a164e5ebba4f7e4a01051cb06"},{"url":"https://git.kernel.org/stable/c/08f0e65e784c4b20e6e620dd4f68d8636073a3d2"}],"title":"crypto: ccp - Do not initialize SNP for ioctl(SNP_CONFIG)","x_generator":{"engine":"bippy-1.2.0"}}}}