CVE-2026-46092
MediumCVSS 5.5Exploitation Probability (EPSS)
Low risk1th percentile - higher than 1% of all known CVEs
Summary
In the rtw88 driver for Wi-Fi cards, a vulnerability was detected due to missing check for the existence of the PCI upstream bridge. The pci_upstream_bridge() function returns NULL when the device is on a root bus, which may cause a crash during initialization of the 8821CE card in an unusual PCI topology.
Risk Assessment
The missing check can cause a system crash when attempting to use the 8821CE Wi-Fi card in a configuration without an upstream PCI bridge, rendering the device unusable and potentially requiring a reboot.
Recommendation
Update the Linux kernel to a version containing the fix that adds a conditional check for the existence of the upstream bridge before applying the specific workaround.
Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: wifi: rtw88: check for PCI upstream bridge existence pci_upstream_bridge() returns NULL if the device is on a root bus. If 8821CE is installed in the system with such a PCI topology, the probing routine will crash. This has probably been unnoticed as 8821CE is mostly supplied in laptops where there is a PCI-to-PCI bridge located upstream from the device. However the card might be installed on a system with different configuration. Check if the bridge does exist for the specific workaround to be applied. Found by Linux Verification Center (linuxtesting.org) with Svace static analysis tool.