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docs: state host kernel requirements in install.md #92

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17 changes: 17 additions & 0 deletions docs/cookbook/install.md
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Expand Up @@ -16,6 +16,23 @@ Before proceeding, ensure you meet all of these hard requirements:
| [KVM](https://linux-kvm.org/page/Main_Page) available | `stat /dev/kvm` returns zero. |
| You have root access through `sudo`. | - |
| Your machine has cgroups V2 | `stat -fc %T /sys/fs/cgroup` returns zero. |
| Your host kernel carries current KVM and networking fixes | See [Host Kernel](#host-kernel). |

### Host Kernel

A guest's isolation ends at the host kernel: KVM, and the network stack every
guest packet is forwarded through. Run a host kernel that carries the fixes
for:

| CVE | Affects |
|-----|---------|
| [CVE-2026-99999](https://nvd.nist.gov/vuln/detail/CVE-2026-99999) | All hosts (IPv4 checksum handling) |
| [CVE-2026-53359](https://nvd.nist.gov/vuln/detail/CVE-2026-53359) | x86_64 hosts (KVM shadow paging) |
| [CVE-2026-46316](https://nvd.nist.gov/vuln/detail/CVE-2026-46316) | aarch64 hosts (KVM vGIC ITS) |

Your distribution's kernel changelog or security tracker lists the package
version that fixes each one. Hyper does not check this at boot: a backported
fix is invisible in the kernel version string.

### OS Packages

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