In the Linux kernel, the following vulnerability has been resolved: wifi: rtw88: check for PCI upstream bridge existence pci_upstream_bridge()… (CVE-2026-46092)
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.
AI Analysis
Technical Summary
The Linux kernel's rtw88 WiFi driver for the 8821CE device improperly assumes the presence of a PCI upstream bridge during device probing. When the device is installed on a system where the PCI topology places it on a root bus without an upstream bridge, pci_upstream_bridge() returns NULL, leading to a crash. This vulnerability is due to a null pointer dereference (CWE-476). The fix involves verifying the existence of the PCI upstream bridge before applying the workaround. The vulnerability affects version 3.0 of the driver and was identified by static analysis from the Linux Verification Center.
Potential Impact
The vulnerability causes a denial of service via a crash of the probing routine for the 8821CE WiFi device driver when installed on systems lacking a PCI upstream bridge. There is no impact on confidentiality or integrity, only availability is affected.
Mitigation Recommendations
A fix is available that adds a check for the PCI upstream bridge before applying the workaround in the rtw88 driver. Users should update to the fixed version of the Linux kernel or driver containing this patch. Since no vendor advisory or patch link is provided, verify the fix status with the Linux kernel source or vendor updates. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance.
In the Linux kernel, the following vulnerability has been resolved: wifi: rtw88: check for PCI upstream bridge existence pci_upstream_bridge()… (CVE-2026-46092)
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.
CVSS v3.1
Score 5.5medium
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Linux kernel's rtw88 WiFi driver for the 8821CE device improperly assumes the presence of a PCI upstream bridge during device probing. When the device is installed on a system where the PCI topology places it on a root bus without an upstream bridge, pci_upstream_bridge() returns NULL, leading to a crash. This vulnerability is due to a null pointer dereference (CWE-476). The fix involves verifying the existence of the PCI upstream bridge before applying the workaround. The vulnerability affects version 3.0 of the driver and was identified by static analysis from the Linux Verification Center.
Potential Impact
The vulnerability causes a denial of service via a crash of the probing routine for the 8821CE WiFi device driver when installed on systems lacking a PCI upstream bridge. There is no impact on confidentiality or integrity, only availability is affected.
Mitigation Recommendations
A fix is available that adds a check for the PCI upstream bridge before applying the workaround in the rtw88 driver. Users should update to the fixed version of the Linux kernel or driver containing this patch. Since no vendor advisory or patch link is provided, verify the fix status with the Linux kernel source or vendor updates. Patch status is not yet confirmed — check the vendor advisory for current remediation guidance.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_vex
- Csaf Version
- 2.0
- Publisher
- Microsoft Security Response Center
- Advisory Id
- msrc_CVE-2026-46092
- Cve Count
- 1
- Additional Cves
- []
- Cvss Version
- 3.1
Threat ID: 6a18ab82e29bf47b50288eef
Added to database: 05/28/2026, 20:54:26 UTC
Last enriched: 06/26/2026, 23:38:02 UTC
Last updated: 07/31/2026, 19:22:59 UTC
Views: 50
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