CVE-2026-68403: Linux kernel · wifi: brcmfmac: initialize SDIO data work before cleanup
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in fb12c87ae855346321af72e57a93c146205f1090 : update Linux kernel when convenient.
Data as of 6 Nov 2026, 17:04 UTC
Rated by Threat Radar · No CVSS score from NVD or the CNA
Thin evidence
One scorer or none- CISA SSVC
- Exploitation
- No evidence of active exploitation and no public proof of concept
- Automatable
- Attackers cannot reliably automate steps 1–4 of the kill chain
- Technical impact
- Limited control over the software or limited information exposure
CISA SSVC assessment, 2026-11-06.
- Patch
- Available – fixed in fb12c87ae855346321af72e57a93c146205f1090, f50a2b9e57a751e70ae9a272875d80d39eaccd6a, c73c3fc1c7ca5a927639f0884624cb244ba791e4 +5
Exploitation evidence
Disclosed: evidence found.
CVE published 10 Aug 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 6 Nov 2026.
What to do
Upgrade to a fixed release listed under Affected software.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
Description
In the Linux kernel, the following vulnerability has been resolved: wifi: brcmfmac: initialize SDIO data work before cleanup brcmf_sdio_probe() stores the newly allocated bus in sdiodev->bus before allocating the ordered workqueue. If that allocation fails, the function jumps to fail and calls brcmf_sdio_remove(). brcmf_sdio_remove() unconditionally cancels bus->datawork. Initialize the work item before the first failure path that can reach brcmf_sdio_remove(), so the cleanup path always observes a valid work object. This issue was found by our static analysis tool and then confirmed by manual review of the probe error path and the remove-time work drain. The problem pattern is an early setup failure that reaches a cleanup helper which cancels an embedded work item before its initializer has run. A QEMU PoC forced alloc_ordered_workqueue() to fail at the same point in brcmf_sdio_probe(), before INIT_WORK(&bus->datawork) is reached. The resulting fail path calls brcmf_sdio_remove(), and DEBUG_OBJECTS reports the invalid work drain with brcmf_sdio_probe() and brcmf_sdio_remove() in the stack.
References
- git.kernel.org/stable/c/860887d22890417d43ef8298f0cc4865e29b54de (opens in a new tab)
- git.kernel.org/stable/c/9a4be91e5bb032b34cb3c962f6d4f82e7ef09364 (opens in a new tab)
- git.kernel.org/stable/c/fb12c87ae855346321af72e57a93c146205f1090 (opens in a new tab)
- git.kernel.org/stable/c/f50a2b9e57a751e70ae9a272875d80d39eaccd6a (opens in a new tab)
- git.kernel.org/stable/c/6bd21ec8549a5854dd64204a66289952917a924c (opens in a new tab)
- git.kernel.org/stable/c/5c342437ea44bb829680ca9e4f683dd5b325b219 (opens in a new tab)
- git.kernel.org/stable/c/c73c3fc1c7ca5a927639f0884624cb244ba791e4 (opens in a new tab)
- git.kernel.org/stable/c/2a665946e0407a05a3f81bd56a08553c446498e0 (opens in a new tab)