crypto: ccp - Do not initialize SNP for ioctl(SNP_CONFIG)

{
  "id": "46c925b8e547f74b4d1a78477199f2c021093f3f30bc861321cfc6effa222341",
  "url": "https://osv.dev/vulnerability/CVE-2026-64307",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "crypto: ccp - Do not initialize SNP for ioctl(SNP_CONFIG)",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: crypto: ccp - Do not initialize SNP for ioctl(SNP_CONFIG) Sashiko notes: > if SEV initialization fails and KVM is actively running normal VMs, could a > userspace process trigger this code path via /dev/sev ioctls (e.g., > SEV_PDH_GEN) and zero out MSR_VM_HSAVE_PA globally? Would the next VMRUN > execution for an active VM trigger a general protection fault and crash the > host? Refuse to re-try initialization if SNP is not already initialized for SNP_CONFIG. This is technically an ABI break: before if SNP initialization failed it could be transparently retriggered by this ioctl, and if no VMs were running, everything worked fine. Hopefully this is enough of a corner case that nobody will notice, but someone does, there are a few options: * do something like symbol_get() for kvm and refuse to initialize if KVM is loaded * check each cpu's HSAVE_PA for non-zero data before re-initializing * once initialization has failed, continue to refuse to initialize until the ccp module is unloaded",
    "evidence": "osv:CVE-2026-64307",
    "products": [
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        "name": {
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        "prerequisites": [],
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    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-64307",
      "aliases": [
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      ],
      "modified": "2026-10-28T02:30:37.656416286Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/08f0e65e784c4b20e6e620dd4f68d8636073a3d2",
        "https://git.kernel.org/stable/c/20f548cdac94860a164e5ebba4f7e4a01051cb06",
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        "https://git.kernel.org/stable/c/441ea32cf2755a0dc593557056b00b7caa0651f5",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64307.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-64307",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
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    "security_relevant": true,
    "severity_evidence": null
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  "source_id": "core-osv",
  "document_id": 504988,
  "published_at": "2026-07-25T08:49:40.782+00:00"
}