Bug 2420348 (CVE-2023-53840)

Summary: CVE-2023-53840 kernel: usb: early: xhci-dbc: Fix a potential out-of-bound memory access
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 2025-12-09 02:04:43 UTC 
In the Linux kernel, the following vulnerability has been resolved:

usb: early: xhci-dbc: Fix a potential out-of-bound memory access

If xdbc_bulk_write() fails, the values in 'buf' can be anything. So the
string is not guaranteed to be NULL terminated when xdbc_trace() is called.

Reserve an extra byte, which will be zeroed automatically because 'buf' is
a static variable, in order to avoid troubles, should it happen.
Comment 1 Alexander B 2025-12-09 18:35:43 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025120957-CVE-2023-53840-797d@gregkh/T