{"id":"CVE-2026-64309","summary":"crypto: ccp - Do not initialize SNP for ioctl(SNP_COMMIT)","details":"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\u003e if SEV initialization fails and KVM is actively running normal VMs, could a\n\u003e userspace process trigger this code path via /dev/sev ioctls (e.g.,\n\u003e SEV_PDH_GEN) and zero out MSR_VM_HSAVE_PA globally? Would the next VMRUN\n\u003e execution for an active VM trigger a general protection fault and crash the\n\u003e 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.","modified":"2026-07-27T04:03:21.203659255Z","published":"2026-07-25T08:49:42.035Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64309.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/5a1364da2f04217a36e2fdfa2db4ee025b383a20"},{"type":"WEB","url":"https://git.kernel.org/stable/c/67ed191b4c8bdf432a3f32d1eb302880b4795cd1"},{"type":"WEB","url":"https://git.kernel.org/stable/c/74768f73854d647a6462f252dc8782ab8a835211"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7a361c74bb12f3398c388905f1d325be642cd36e"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64309.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64309"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"1c3506ea8599a3ad1b9aae5cbd573134f8d18db7"},{"fixed":"74768f73854d647a6462f252dc8782ab8a835211"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"ceac7fb89e8da465aec3ac3c20477f912f5c3a6c"},{"fixed":"7a361c74bb12f3398c388905f1d325be642cd36e"},{"fixed":"67ed191b4c8bdf432a3f32d1eb302880b4795cd1"},{"fixed":"5a1364da2f04217a36e2fdfa2db4ee025b383a20"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"6.12.75"},{"fixed":"6.12.96"}]}],"versions":["v6.12.95","v6.12.94","v6.12.93","v6.12.92","v6.12.91","v6.12.90","v6.12.89","v6.12.88","v6.12.87","v6.12.86","v6.12.85","v6.12.84","v6.12.83","v6.12.82","v6.12.81","v6.12.80","v6.12.79","v6.12.78","v6.12.77","v6.12.76","v6.12.75"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64309.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.12.96"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.39"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.16.0"},{"fixed":"7.1.4"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64309.json"}}],"schema_version":"1.7.5"}