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
Updated2026-05-20 18:21:21 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

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.000140000 probability, percentile 0.030430000 (date 2026-05-27)

Problem Types: CWE-476

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All
Operating System Linux Linux Kernel 7.0 rc1 All All
Operating System Linux Linux Kernel 7.0 rc2 All All
Operating System Linux Linux Kernel 7.0 rc3 All All
Operating System Linux Linux Kernel 7.0 rc4 All All

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