CVE-2026-46092 wifi: rtw88: check for PCI upstream bridge existence
A null pointer dereference in the rtw88 WiFi driver causes a kernel crash when specific PCI topologies are used, leading to denial of service.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-46092?
CVE-2026-46092 is a medium-severity vulnerability in Linux kernel, published on 27 May 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
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.
Weakness: CWE-476
Which versions are affected by CVE-2026-46092?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-46092?
Apply the vendor's patch.
Is CVE-2026-46092 being exploited?
There is no known exploitation of CVE-2026-46092 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-88484, BELL-CVE-2026-46092, DEBIAN-CVE-2026-46092, GHSA-wxwq-c95x-686r, ROOT-OS-DEBIAN-12-CVE-2026-46092, ROOT-OS-DEBIAN-13-CVE-2026-46092 and 3 more.