CVE-2026-23042
Unknown Unknown - Not Provided
Null Pointer Dereference in Linux idpf Driver on RDMA-disabled Vports

Publication date: 2026-02-04

Last updated on: 2026-02-04

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: idpf: fix aux device unplugging when rdma is not supported by vport If vport flags do not contain VIRTCHNL2_VPORT_ENABLE_RDMA, driver does not allocate vdev_info for this vport. This leads to kernel NULL pointer dereference in idpf_idc_vport_dev_down(), which references vdev_info for every vport regardless. Check, if vdev_info was ever allocated before unplugging aux device.
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Meta Information
Published
2026-02-04
Last Modified
2026-02-04
Generated
2026-06-16
AI Q&A
2026-02-04
EPSS Evaluated
2026-06-15
NVD
CVE-2026-23042
EUVD
EUVD-2026-5505
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *
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Exploitability
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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 idpf driver related to auxiliary device unplugging when RDMA (Remote Direct Memory Access) is not supported by a virtual port (vport). Specifically, if the vport flags do not include VIRTCHNL2_VPORT_ENABLE_RDMA, the driver does not allocate the vdev_info structure for that vport. However, the function idpf_idc_vport_dev_down() assumes vdev_info is always allocated and references it regardless, leading to a kernel NULL pointer dereference.

The fix involves checking whether vdev_info was allocated before attempting to unplug the auxiliary device, preventing the NULL pointer dereference.

Impact Analysis

This vulnerability can cause a kernel NULL pointer dereference, which typically results in a kernel crash or system instability. Such crashes can lead to denial of service conditions, potentially disrupting normal operations on affected Linux systems using the idpf driver.

Compliance Impact

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