Bug 2396123 (CVE-2023-53356)

Summary: CVE-2023-53356 kernel: usb: gadget: u_serial: Add null pointer check in gserial_suspend
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: medium    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
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Hardware: All   
OS: Linux   
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Description OSIDB Bzimport 2025-09-17 15:02:40 UTC 
In the Linux kernel, the following vulnerability has been resolved:

usb: gadget: u_serial: Add null pointer check in gserial_suspend

Consider a case where gserial_disconnect has already cleared
gser->ioport. And if gserial_suspend gets called afterwards,
it will lead to accessing of gser->ioport and thus causing
null pointer dereference.

Avoid this by adding a null pointer check. Added a static
spinlock to prevent gser->ioport from becoming null after
the newly added null pointer check.
Comment 1 Jon Moroney 2025-09-17 18:08:19 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025091721-CVE-2023-53356-5383@gregkh/T