What’s Vulnerable › Vulnerabilities

CVE-2026-46092: wifi: rtw88: check for PCI upstream bridge existence

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-27 · updated 2026-10-15
• Weakness: CWE-476

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.

Affected products

• Linux kernel: from 5.15.17 before 5.16; from 5.16.3 before 7.1 — fixed in 5.16, 7.1

How to fix

Upgrade to a fixed version: Linux kernel 5.16, 7.1. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/000134a20bbf89b1152520a2eef71f91fdb83a5b
• https://git.kernel.org/stable/c/3b89b4c095804c478d50376285e66700cf3c045f
• https://git.kernel.org/stable/c/3bbbb56204f7359ce2139a9341b43b52a186261c
• https://git.kernel.org/stable/c/6c53d68e3bcfc8faccdd76c3383a9232b05c9ae6
• https://git.kernel.org/stable/c/959c13da6c36167ce1016d400a6104d2367f686e
• https://git.kernel.org/stable/c/cc9b6303e7ea91bc360b42c7edc1fe9ceb2f47fe
• https://git.kernel.org/stable/c/eb101d2abdcccb514ca4fccd3b278dd8267374f6
• https://cert-portal.siemens.com/productcert/html/ssa-784472.html

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