CVE-2023-53565
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-10-04

Last updated on: 2026-03-21

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: wifi: brcmfmac: Check for probe() id argument being NULL The probe() id argument may be NULL in 2 scenarios: 1. brcmf_pcie_pm_leave_D3() calling brcmf_pcie_probe() to reprobe the device. 2. If a user tries to manually bind the driver from sysfs then the sdio / pcie / usb probe() function gets called with NULL as id argument. 1. Is being hit by users causing the following oops on resume and causing wifi to stop working: BUG: kernel NULL pointer dereference, address: 0000000000000018 <snip> Hardware name: Dell Inc. XPS 13 9350/0PWNCR, BIDS 1.13.0 02/10/2020 Workgueue: events_unbound async_run_entry_fn RIP: 0010:brcmf_pcie_probe+Ox16b/0x7a0 [brcmfmac] <snip> Call Trace: <TASK> brcmf_pcie_pm_leave_D3+0xc5/8x1a0 [brcmfmac be3b4cefca451e190fa35be8f00db1bbec293887] ? pci_pm_resume+0x5b/0xf0 ? pci_legacy_resume+0x80/0x80 dpm_run_callback+0x47/0x150 device_resume+0xa2/0x1f0 async_resume+0x1d/0x30 <snip> Fix this by checking for id being NULL. In the PCI and USB cases try a manual lookup of the id so that manually binding the driver through sysfs and more importantly brcmf_pcie_probe() on resume will work. For the SDIO case there is no helper to do a manual sdio_device_id lookup, so just directly error out on a NULL id there.
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Meta Information
Published
2025-10-04
Last Modified
2026-03-21
Generated
2026-05-07
AI Q&A
2025-10-04
EPSS Evaluated
2026-05-05
NVD
CVE-2023-53565
EUVD
EUVD-2025-32316
Affected Vendors & Products
Showing 3 associated CPEs
Vendor Product Version / Range
linux linux_kernel 6.4
linux linux_kernel 6.4
linux linux_kernel From 6.2 (inc) to 6.3.4 (exc)
Helpful Resources
Exploitability
CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-476 The product dereferences a pointer that it expects to be valid but is NULL.
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?

This vulnerability occurs in the Linux kernel's brcmfmac wifi driver where the probe() function's id argument can be NULL in certain scenarios, such as when the device is reprobed during resume or when a user manually binds the driver via sysfs. This leads to a NULL pointer dereference causing a kernel oops and the wifi to stop working. The fix involves checking if the id argument is NULL and handling it appropriately to prevent the crash.


How can this vulnerability impact me? :

If this vulnerability is triggered, it can cause the wifi functionality on affected devices to stop working due to a kernel crash (NULL pointer dereference). This can disrupt network connectivity, especially on devices using the affected brcmfmac driver, such as certain Dell XPS models.


How can this vulnerability be detected on my network or system? Can you suggest some commands?

This vulnerability can be detected by monitoring kernel logs for the specific NULL pointer dereference oops related to brcmf_pcie_probe. You can check the kernel log for messages like 'BUG: kernel NULL pointer dereference' involving brcmf_pcie_probe and brcmf_pcie_pm_leave_D3. Use commands such as 'dmesg | grep brcmf_pcie_probe' or 'journalctl -k | grep brcmf_pcie_probe' to look for these error messages indicating the issue.


What immediate steps should I take to mitigate this vulnerability?

Immediate mitigation involves updating the Linux kernel to a version where this vulnerability is fixed, which includes the check for the probe() id argument being NULL. Until then, avoid manually binding the brcmfmac driver through sysfs to prevent triggering the NULL id argument scenario. Additionally, avoid suspending and resuming the device in ways that trigger brcmf_pcie_pm_leave_D3 reprobe calls.


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