EUVD-2026-28737
GHSA-q7mh-rc36-3j7h
CVSS VectorNVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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4DescriptionNVD
In the Linux kernel, the following vulnerability has been resolved:
xhci: Fix NULL pointer dereference when reading portli debugfs files
Michal reported and debgged a NULL pointer dereference bug in the recently added portli debugfs files
Oops is caused when there are more port registers counted in xhci->max_ports than ports reported by Supported Protocol capabilities. This is possible if max_ports is more than maximum port number, or if there are gaps between ports of different speeds the 'Supported Protocol' capabilities.
In such cases port->rhub will be NULL so we can't reach xhci behind it. Add an explicit NULL check for this case, and print portli in hex without dereferencing port->rhub.
AnalysisAI
NULL pointer dereference in the Linux kernel's xhci USB host controller debugfs interface allows a local low-privileged user to crash the kernel (denial of service) by reading portli debugfs files. The flaw surfaces when xhci's max_ports count exceeds the number of ports covered by Supported Protocol capabilities - producing NULL rhub pointers - which the portli read handler dereferences without checking. …
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