Bug 2426028 (CVE-2022-50809)

Summary: CVE-2022-50809 kernel: Linux kernel xHCI DbC: Denial of Service via memory leak
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Version: unspecifiedKeywords: Security
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OS: Linux   
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A flaw was found in the Linux kernel's xHCI Debug Capability (DbC) module. A local user with low privileges could exploit a memory leak in the xhci_alloc_dbc() function. This occurs when the DbC is already in use, and allocated memory for the xhci_dbc structure is not properly released. This vulnerability can lead to a denial of service (DoS) due to resource exhaustion.
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Description OSIDB Bzimport 2025-12-30 13:03:15 UTC 
In the Linux kernel, the following vulnerability has been resolved:

xhci: dbc: Fix memory leak in xhci_alloc_dbc()

If DbC is already in use, then the allocated memory for the xhci_dbc struct
doesn't get freed before returning NULL, which leads to a memleak.
Comment 1 Alexander B 2025-12-31 14:35:36 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025123012-CVE-2022-50809-e4a0@gregkh/T