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

> A local attacker can trigger a kernel warning and potential denial of service in the brcmfmac Wi-Fi driver by configuring 802.1X-SHA256 authentication.

- **Severity:** Not scored
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 10 Aug 2026
- **Updated:** 19 Aug 2026
- **Also known as:** BELL-CVE-2026-68304, DEBIAN-CVE-2026-68304, GHSA-gqh4-q6g4-cvr4, UBUNTU-CVE-2026-68304

## What is CVE-2026-68304?

CVE-2026-68304 is a denial of service vulnerability in Linux, published on 10 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official 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

## Which versions are affected by CVE-2026-68304?


## How do I fix CVE-2026-68304?

Apply the vendor's patch.

## Is CVE-2026-68304 being exploited?

There is no known exploitation of CVE-2026-68304 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-68304 and fix it if it is affected.

What it is: CVE-2026-68304 is a denial of service vulnerability in Linux, published on 10 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-68304 in the wild and no public exploit code.

Affected product: Linux. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-68304/ (Markdown: https://insights.sbomify.com/CVE-2026-68304/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-68304
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-68304
- OSV: https://osv.dev/vulnerability/CVE-2026-68304

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-68304/
Summaries are generated and may contain mistakes; the official description above is the record.