CVE-2026-43431

Summary

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.

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/9c8bef223c6e991276188d30d74bdb2cbd8be652
• https://git.kernel.org/stable/c/ae4ff9dead5efa2025eddfcdb29411432bf40a7c

• ←Previous
• Next→