xhci: Fix NULL pointer dereference when reading portli debugfs files

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Summary

CVECVE-2026-43431
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-08 15:16:55 UTC
Updated2026-05-12 14:10:27 UTC
DescriptionIn 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.

Risk And Classification

EPSS: 0.000180000 probability, percentile 0.050790000 (date 2026-05-12)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 384c57ec720597f8104f69082cdd261abb998b80 9c8bef223c6e991276188d30d74bdb2cbd8be652 git Not specified
CNA Linux Linux affected 384c57ec720597f8104f69082cdd261abb998b80 ae4ff9dead5efa2025eddfcdb29411432bf40a7c git Not specified
CNA Linux Linux affected 6.19 Not specified
CNA Linux Linux unaffected 6.19 semver Not specified
CNA Linux Linux unaffected 6.19.9 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/9c8bef223c6e991276188d30d74bdb2cbd8be652 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ae4ff9dead5efa2025eddfcdb29411432bf40a7c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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