CVE-2026-46009
Analyzed Analyzed - Analysis Complete
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
2026-06-16
AI Q&A
2026-05-27
EPSS Evaluated
2026-06-15
NVD
CVE-2026-46009
EUVD
EUVD-2026-32306
Affected Vendors & Products
Showing 6 associated CPEs
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)
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Exploitability
CWE
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KEV
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CWE ID Description
CWE-UNKNOWN
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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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