Cloud Vulnerability DB
A community-led vulnerabilities database
Vulnerability DatabaseCVE-2022-50576
CVE-2022-50576:
Linux Kernel vulnerability analysis and mitigation
Overview
CVE-2022-50576 is a vulnerability discovered in the Linux kernel related to a PCI device refcount leak in the pchrequestdma() function. The vulnerability was published on October 22, 2025 (NVD).
Technical details
The vulnerability exists in the serial PCH driver where pcigetslot() returns a PCI device with its refcount increased, but the reference count was not being properly decremented by calling pcidevput(). Since 'dmadev' is only used to filter the channel in filter(), the missing pcidevput() call was needed before exiting from pchrequest_dma() for both normal and error paths (Debian).
Impact
The vulnerability results in a reference count leak in the Linux kernel's PCI device handling, which could potentially lead to resource management issues (NVD).
Mitigation and workarounds
The issue has been fixed in multiple Linux kernel versions including: Debian bullseye (5.10.223-1), bookworm (6.1.148-1), trixie (6.12.43-1), and sid (6.17.7-1). Users should update their kernel to the patched versions (Debian).
Additional resources
Source: This report was generated using AI
Related Linux Kernel vulnerabilities:
Free Vulnerability Assessment
Benchmark your Cloud Security Posture
Evaluate your cloud security practices across 9 security domains to benchmark your risk level and identify gaps in your defenses.
Additional Wiz resources
Get a personalized demo
Ready to see Wiz in action?
"Best User Experience I have ever seen, provides full visibility to cloud workloads."
David EstlickCISO
"Wiz provides a single pane of glass to see what is going on in our cloud environments."
Adam FletcherChief Security Officer
"We know that if Wiz identifies something as critical, it actually is."
Greg PoniatowskiHead of Threat and Vulnerability Management