wifi: rtw88: check for PCI upstream bridge existence

Summary

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.

Timeline

1. May 27, 2026, 12:58 PM UTCCVE published
2. Oct 15, 2026, 1:20 AM UTCRecord last updated

Affected versions

• Linux Linux

  From 617339466fda09916c4b4151fa5e6a9c1fdae353 · fixed in 959c13da6c36167ce1016d400a6104d2367f686e; From 24f5e38a13b5ae2b6105cda8bb47c19108e62a9a · fixed in 3b89b4c095804c478d50376285e66700cf3c045f; From 24f5e38a13b5ae2b6105cda8bb47c19108e62a9a · fixed in cc9b6303e7ea91bc360b42c7edc1fe9ceb2f47fe; From 24f5e38a13b5ae2b6105cda8bb47c19108e62a9a · fixed in 6c53d68e3bcfc8faccdd76c3383a9232b05c9ae6; From 24f5e38a13b5ae2b6105cda8bb47c19108e62a9a · fixed in 000134a20bbf89b1152520a2eef71f91fdb83a5b; From 24f5e38a13b5ae2b6105cda8bb47c19108e62a9a · fixed in 3bbbb56204f7359ce2139a9341b43b52a186261c; From 24f5e38a13b5ae2b6105cda8bb47c19108e62a9a · fixed in eb101d2abdcccb514ca4fccd3b278dd8267374f6; From 5.15.17 · fixed in 5.15.210; From 5.16.3 · fixed in 5.17

• Linux Linux

  5.17

• KernelLinux

  fixed in 5.15.210; From 5.16.0 · fixed in 6.1.175; From 5.17.0 · fixed in 6.6.140; From 6.2.0 · fixed in 6.12.86; From 6.7.0 · fixed in 6.18.27; From 6.13.0 · fixed in 7.0.4

References 7