PCI Endpoint NTB Duplicate Resource Teardown Vulnerability

Publication date: 2026-05-27

Last updated on: 2026-06-16

Assigner: kernel.org

Description

In the Linux kernel, the following vulnerability has been resolved: PCI: endpoint: pci-epf-ntb: Remove duplicate resource teardown epf_ntb_epc_destroy() duplicates the teardown that the caller is supposed to do later. This leads to an oops when .allow_link fails or when .drop_link is performed. Remove the helper. Also drop pci_epc_put(). EPC device refcounting is tied to configfs EPC group lifetime, and pci_epc_put() in the .drop_link path is sufficient.

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Meta Information

Published

2026-05-27

Last Modified

2026-06-16

Generated

2026-07-07

AI Q&A

2026-05-27

EPSS Evaluated

2026-07-05

NVD

CVE-2026-46009

EUVD

EUVD-2026-32306

Affected Vendors & Products

Vendor	Product	Version / Range
linux	linux_kernel	From 6.7 (inc) to 6.12.86 (exc)
linux	linux_kernel	From 5.16 (inc) to 6.1.175 (exc)
linux	linux_kernel	From 6.2 (inc) to 6.6.140 (exc)
linux	linux_kernel	From 6.13 (inc) to 6.18.27 (exc)
linux	linux_kernel	From 6.19 (inc) to 7.0.4 (exc)
linux	linux_kernel	From 5.12 (inc) to 5.15.209 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-UNKNOWN

Attack-Flow Graph

Executive Summary

This vulnerability exists in the Linux kernel's PCI endpoint function pci-epf-ntb. Specifically, the function epf_ntb_epc_destroy() performs a duplicate resource teardown that the caller is already supposed to handle later. This duplication can cause a kernel oops (a type of crash) when certain operations like .allow_link fail or when .drop_link is executed. The fix involves removing this redundant helper function and adjusting reference counting related to the EPC device.

Impact Analysis

This vulnerability can lead to a kernel oops, which is a crash or fault in the Linux kernel. Such crashes can cause system instability, potential denial of service, or unexpected behavior in systems using the affected PCI endpoint functions. This may disrupt normal operations or require system reboots.

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