{"id":"CVE-2026-64309","state":"PUBLISHED","title":"crypto: ccp - Do not initialize SNP for ioctl(SNP_COMMIT)","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: ccp - Do not initialize SNP for ioctl(SNP_COMMIT)\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 SNP_COMMIT command does not require the firmware to be in any\nparticular state. Skip initializing it if it was previously uninitialized.\n\nThe SEV-SNP firmware specification doc 56860 does not mention SNP_COMMIT in\nTable 5 as a command that is allowed in the UNINIT state, but it is in fact\nallowed and a future documentation update will reflect that.","publishedAt":"2026-07-25T08:49:42.035Z","updatedAt":"2026-08-17T04:53:08.770Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"1c3506ea8599a3ad1b9aae5cbd573134f8d18db7","status":"affected","lessThan":"74768f73854d647a6462f252dc8782ab8a835211","versionType":"git"},{"version":"ceac7fb89e8da465aec3ac3c20477f912f5c3a6c","status":"affected","lessThan":"7a361c74bb12f3398c388905f1d325be642cd36e","versionType":"git"},{"version":"ceac7fb89e8da465aec3ac3c20477f912f5c3a6c","status":"affected","lessThan":"67ed191b4c8bdf432a3f32d1eb302880b4795cd1","versionType":"git"},{"version":"ceac7fb89e8da465aec3ac3c20477f912f5c3a6c","status":"affected","lessThan":"5a1364da2f04217a36e2fdfa2db4ee025b383a20","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/74768f73854d647a6462f252dc8782ab8a835211","https://git.kernel.org/stable/c/7a361c74bb12f3398c388905f1d325be642cd36e","https://git.kernel.org/stable/c/67ed191b4c8bdf432a3f32d1eb302880b4795cd1","https://git.kernel.org/stable/c/5a1364da2f04217a36e2fdfa2db4ee025b383a20"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:41.951Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/64xxx/CVE-2026-64309.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-64309","state":"PUBLISHED","datePublished":"2026-07-25T08:49:42.035Z","dateUpdated":"2026-08-17T04:53:08.770Z","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_COMMIT)","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: ccp - Do not initialize SNP for ioctl(SNP_COMMIT)\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 SNP_COMMIT command does not require the firmware to be in any\nparticular state. Skip initializing it if it was previously uninitialized.\n\nThe SEV-SNP firmware specification doc 56860 does not mention SNP_COMMIT in\nTable 5 as a command that is allowed in the UNINIT state, but it is in fact\nallowed and a future documentation update will reflect that."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"1c3506ea8599a3ad1b9aae5cbd573134f8d18db7","status":"affected","lessThan":"74768f73854d647a6462f252dc8782ab8a835211","versionType":"git"},{"version":"ceac7fb89e8da465aec3ac3c20477f912f5c3a6c","status":"affected","lessThan":"7a361c74bb12f3398c388905f1d325be642cd36e","versionType":"git"},{"version":"ceac7fb89e8da465aec3ac3c20477f912f5c3a6c","status":"affected","lessThan":"67ed191b4c8bdf432a3f32d1eb302880b4795cd1","versionType":"git"},{"version":"ceac7fb89e8da465aec3ac3c20477f912f5c3a6c","status":"affected","lessThan":"5a1364da2f04217a36e2fdfa2db4ee025b383a20","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/74768f73854d647a6462f252dc8782ab8a835211"},{"url":"https://git.kernel.org/stable/c/7a361c74bb12f3398c388905f1d325be642cd36e"},{"url":"https://git.kernel.org/stable/c/67ed191b4c8bdf432a3f32d1eb302880b4795cd1"},{"url":"https://git.kernel.org/stable/c/5a1364da2f04217a36e2fdfa2db4ee025b383a20"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-17T04:53:08.770Z"},"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"}}}}}