Medium severity · published May 27, 2026
CVE-2026-46092
wifi: rtw88: check for PCI upstream bridge existence
5.5
CVSS
0.1%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.1% · higher than 3% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
KE
Kernel · Linux
5.15.17 before 5.16; 5.16.3 before 7.1 · source: NVD
LI
Linux · Linux
617339466fda09916c4b4151fa5e6a9c1fdae353 before 959c13da6c36167ce1016d400a6104d2367f686e; 24f5e38a13b5ae2b6105cda8bb47c19108e62a9a before 3b89b4c095804c478d50376285e66700cf3c045f; 24f5e38a13b5ae2b6105cda8bb47c19108e62a9a before cc9b6303e7ea91bc360b42c7edc1fe9ceb2f47fe; 24f5e38a13b5ae2b6105cda8bb47c19108e62a9a before 6c53d68e3bcfc8faccdd76c3383a9232b05c9ae6; 24f5e38a13b5ae2b6105cda8bb47c19108e62a9a before 000134a20bbf89b1152520a2eef71f91fdb83a5b; 24f5e38a13b5ae2b6105cda8bb47c19108e62a9a before 3bbbb56204f7359ce2139a9341b43b52a186261c; +5 more · source: vendor
SS
SIMATIC S7-1500 TM MFP - GNU/Linux subsystem · Siemens
0 · source: CISA
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-46092
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-46092
git.kernel.org
https://git.kernel.org/stable/c/000134a20bbf89b1152520a2eef71f91fdb83a5b
git.kernel.org
https://git.kernel.org/stable/c/3b89b4c095804c478d50376285e66700cf3c045f
git.kernel.org
https://git.kernel.org/stable/c/3bbbb56204f7359ce2139a9341b43b52a186261c
git.kernel.org
https://git.kernel.org/stable/c/6c53d68e3bcfc8faccdd76c3383a9232b05c9ae6
git.kernel.org
https://git.kernel.org/stable/c/959c13da6c36167ce1016d400a6104d2367f686e
git.kernel.org
https://git.kernel.org/stable/c/cc9b6303e7ea91bc360b42c7edc1fe9ceb2f47fe
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