wifi: rtw88: check for PCI upstream bridge existence

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Summary

CVECVE-2026-46092
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-27 14:17:30 UTC
Updated2026-06-25 21:15:55 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.000180000 probability, percentile 0.052520000 (date 2026-06-01)

Problem Types: CWE-476

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 24f5e38a13b5ae2b6105cda8bb47c19108e62a9a eb101d2abdcccb514ca4fccd3b278dd8267374f6 git Not specified
CNA Linux Linux affected 617339466fda09916c4b4151fa5e6a9c1fdae353 git Not specified
CNA Linux Linux affected f21e8cb927fa9da49490b74ddda3856a828b82d6 git Not specified
CNA Linux Linux affected 5.15.17 5.16 semver Not specified
CNA Linux Linux affected 5.16.3 5.17 semver Not specified
CNA Linux Linux affected 5.17 Not specified
CNA Linux Linux unaffected 5.17 semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/eb101d2abdcccb514ca4fccd3b278dd8267374f6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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