Bug 2424609 (CVE-2025-68342)

Summary: CVE-2025-68342 kernel: can: gs_usb: gs_usb_receive_bulk_callback(): check actual_length before accessing data
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Version: unspecifiedKeywords: Security
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OS: Linux   
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Description OSIDB Bzimport 2025-12-23 15:02:02 UTC 
In the Linux kernel, the following vulnerability has been resolved:

can: gs_usb: gs_usb_receive_bulk_callback(): check actual_length before accessing data

The URB received in gs_usb_receive_bulk_callback() contains a struct
gs_host_frame. The length of the data after the header depends on the
gs_host_frame hf::flags and the active device features (e.g. time
stamping).

Introduce a new function gs_usb_get_minimum_length() and check that we have
at least received the required amount of data before accessing it. Only
copy the data to that skb that has actually been received.

[mkl: rename gs_usb_get_minimum_length() -> +gs_usb_get_minimum_rx_length()]
Comment 1 Keith Grant 2025-12-23 16:24:05 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025122332-CVE-2025-68342-7f69@gregkh/T