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: linux kernel
References8
- git.kernel.org/stable/c/eb101d2abdcccb514ca4fccd3b278dd8267374f6 Patch
- git.kernel.org/stable/c/000134a20bbf89b1152520a2eef71f91fdb83a5b
- git.kernel.org/stable/c/3b89b4c095804c478d50376285e66700cf3c045f
- git.kernel.org/stable/c/3bbbb56204f7359ce2139a9341b43b52a186261c
- git.kernel.org/stable/c/6c53d68e3bcfc8faccdd76c3383a9232b05c9ae6
- git.kernel.org/stable/c/959c13da6c36167ce1016d400a6104d2367f686e
- git.kernel.org/stable/c/cc9b6303e7ea91bc360b42c7edc1fe9ceb2f47fe
- cert-portal.siemens.com/productcert/html/ssa-784472.html
Metrics
- CVSS 3.1
-
5.5
MEDIUM
Score source: NVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H - EPSS — exploit probability
- 0% percentile: 3 · as of 14 November 2026
- CWE
- CWE-476
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