# CVE-2026-90380: wifi: mt76: mt792x: fix use-after-free in mt76_rx_poll_complete

> A race condition in the Linux kernel mt76 WiFi driver causes a use-after-free, potentially leading to system crashes or arbitrary code execution.

- **Severity:** High 8.8 (`CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 17 Sep 2026
- **Updated:** 19 Oct 2026
- **Also known as:** BELL-CVE-2026-90380, DEBIAN-CVE-2026-90380, GHSA-64jx-xh98-9hg9, UBUNTU-CVE-2026-90380

## What is CVE-2026-90380?

CVE-2026-90380 is a high-severity use after free vulnerability in Linux, published on 17 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

In the Linux kernel, the following vulnerability has been resolved:

wifi: mt76: mt792x: fix use-after-free in mt76_rx_poll_complete

A use-after-free issue occurs in mt76_rx_poll_complete due to a race
condition. The STA has already been removed, but the rx_status still
had a pointer to the wcid in the STA.

Set the links' wcid pointers to be NULL for a MLD in
mt7925_sta_pre_rcu_remove()

BUG: KASAN: invalid-access in mt76_rx_poll_complete+0x280/0x470
Call trace:
dump_backtrace+0xec/0x128
show_stack+0x18/0x28
dump_stack_lvl+0x40/0xc8
print_report+0x1b8/0x710
kasan_report+0xe0/0x144
do_bad_area+0x120/0x260
do_tag_check_fault+0x20/0x34
do_mem_abort+0x54/0xa8
el1_abort+0x3c/0x5c
el1h_64_sync_handler+0x40/0xcc
el1h_64_sync+0x7c/0x80
mt76_rx_poll_complete+0x280/0x470
mt76_dma_rx_poll+0x114/0x51c
mt792x_poll_rx+0x60/0xf8
napi_threaded_poll_loop+0xe0/0x450
napi_threaded_poll+0x80/0x9c
kthread+0x11c/0x158
ret_from_fork+0x10/0x20

## Which versions are affected by CVE-2026-90380?


## How do I fix CVE-2026-90380?

Apply the vendor's patch.

## Is CVE-2026-90380 being exploited?

There is no known exploitation of CVE-2026-90380 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-90380 and fix it if it is affected.

What it is: CVE-2026-90380 is a high-severity use after free vulnerability in Linux, published on 17 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-90380 in the wild and no public exploit code.

Affected product: Linux. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-90380/ (Markdown: https://insights.sbomify.com/CVE-2026-90380/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-90380
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-90380
- OSV: https://osv.dev/vulnerability/CVE-2026-90380

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-90380/
Summaries are generated and may contain mistakes; the official description above is the record.