CVE-2026-46092: wifi: rtw88: check for PCI upstream bridge existence
In the Linux kernel, the following vulnerability has been resolved:
wifi: rtw88: check for PCI upstream bridge existence
pciupstreambridge() 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.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2026-46092?
CVE-2026-46092 has a medium severity rating of 5.5.
What impact does CVE-2026-46092 have on Linux kernel systems?
CVE-2026-46092 can cause a probing routine crash if the 8821CE device is installed on a root bus.
How do I fix CVE-2026-46092?
To mitigate CVE-2026-46092, ensure your Linux kernel and rtw88 driver are updated to the latest version where the vulnerability is resolved.
What is the CVSS score of CVE-2026-46092?
CVE-2026-46092 has a CVSS score of 5.5, indicating a medium level of risk.
Is CVE-2026-46092 relevant to Microsoft systems?
Yes, CVE-2026-46092 also affects the Microsoft azl3 kernel 6.6.139.1-1.