CVE-2026-80621
Received Received - Intake

NULL Dereference in Linux Kernel PCI DWC Driver

Publication date: 2026-08-28

Last updated on: 2026-08-28

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: PCI: dwc: Avoid dwc_pcie_rasdes_debugfs_deinit() NULL dereference when no RAS DES capability dwc_pcie_rasdes_debugfs_init() returns success when the controller has no RAS DES capability, leaving pci->debugfs->rasdes_info unset. The common debugfs teardown path still calls dwc_pcie_rasdes_debugfs_deinit(), which dereferences rasdes_info unconditionally. Return early when no RAS DES state was allocated. In that case no RAS DES mutex was initialized, so there is nothing to destroy. [mani: reworded subject]

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Meta Information

Published
2026-08-28
Last Modified
2026-08-28
Generated
2026-09-17
AI Q&A
2026-08-28
EPSS Evaluated
2026-09-15
NVD
CVE-2026-80621
EUVD
EUVD-2026-67497

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *

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Exploitability

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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This is a Linux kernel vulnerability where a NULL pointer dereference occurs in the PCI subsystem. The issue happens when a debugfs cleanup function tries to access RAS DES debugfs info that was never initialized because the controller lacks RAS DES capability. The function dwc_pcie_rasdes_debugfs_init() incorrectly returns success even when no RAS DES state was allocated, leading to a crash during teardown.

Detection Guidance

This vulnerability is specific to the Linux kernel's PCI subsystem and does not have a direct network detection method. It can be detected by checking the kernel version and verifying if the affected code path is present. Use commands like 'uname -a' to check the kernel version and 'dmesg | grep -i pci' to inspect PCI-related errors.

Impact Analysis

If you use a Linux system with affected PCI controllers, this bug could cause kernel crashes or instability when the system attempts to clean up debugfs entries. This may lead to system freezes, reboots, or potential denial of service if the crash occurs during critical operations.

Compliance Impact

This vulnerability does not directly affect compliance with standards like GDPR or HIPAA. It is a Linux kernel issue related to a NULL dereference in PCI debugfs functionality, which could lead to system instability or crashes but does not involve data privacy or security controls relevant to these regulations.

Mitigation Strategies

Update the Linux kernel to a version that includes the fix for this vulnerability. Monitor kernel updates from your distribution and apply patches promptly. If immediate patching is not possible, consider disabling debugfs for the affected PCI controller as a temporary workaround.

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