CVE-2026-43431 Details
Description
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.
A NULL pointer dereference vulnerability has been identified in the Linux kernel's xHCI debugfs Port Link Info (PORTLI) files. This issue arises when the number of port registers in 'xhci->max_ports' exceeds those indicated by the Supported Protocol capabilities. Such a discrepancy can occur if 'max_ports' surpasses the maximum port number or if there are gaps between ports of varying speeds, leading to 'port->rhub' being NULL. Consequently, the xHCI information cannot be accessed. The vulnerability has been addressed by implementing a NULL check and modifying the PORTLI output to avoid dereferencing the NULL pointer.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://git.kernel.org/stable/c/9c8bef223c6e991276188d30d74bdb2cbd8be652 | kernel.org | Patch |
| https://git.kernel.org/stable/c/ae4ff9dead5efa2025eddfcdb29411432bf40a7c | kernel.org | Patch |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-476 | NULL Pointer Dereference | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| linux linux kernel | >= 6.19, < 6.19.9 7.0 rc1 7.0 rc2 7.0 rc3 7.0 rc4 |
CPE
Remediation
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Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | kernel.org |
| May 20, 2026 | Initial Analysis | [email protected] |
| May 8, 2026 | New CVE Received | kernel.org |