Bug 2401481 (CVE-2023-53551)

Summary: CVE-2023-53551 kernel: usb: gadget: u_serial: Add null pointer check in gserial_resume
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: low    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
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Hardware: All   
OS: Linux   
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Description OSIDB Bzimport 2025-10-04 16:02:56 UTC 
In the Linux kernel, the following vulnerability has been resolved:

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

Consider a case where gserial_disconnect has already cleared
gser->ioport. And if a wakeup interrupt triggers afterwards,
gserial_resume gets called, which will lead to accessing of
gser->ioport and thus causing null pointer dereference.Add
a null pointer check to prevent this.

Added a static spinlock to prevent gser->ioport from becoming
null after the newly added check.
Comment 1 Alexander B 2025-10-06 16:20:46 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025100447-CVE-2023-53551-4afc@gregkh/T