Bug 2401565 (CVE-2022-50470)

Summary: CVE-2022-50470 kernel: xhci: Remove device endpoints from bandwidth list when freeing the device
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: medium    
Version: unspecifiedKeywords: Security
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OS: Linux   
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A null pointer/list corruption flaw was found in the Linux kernel USB xHCI host controller code. When the xHCI host is dying or being removed, some device endpoints may remain on the software bandwidth list. Later cleanup deletes entries that were already freed, corrupting the list and crashing the kernel. A local user could use this flaw to crash system, causing denial of service.
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Description OSIDB Bzimport 2025-10-04 16:07:44 UTC 
In the Linux kernel, the following vulnerability has been resolved:

xhci: Remove device endpoints from bandwidth list when freeing the device

Endpoints are normally deleted from the bandwidth list when they are
dropped, before the virt device is freed.

If xHC host is dying or being removed then the endpoints aren't dropped
cleanly due to functions returning early to avoid interacting with a
non-accessible host controller.

So check and delete endpoints that are still on the bandwidth list when
freeing the virt device.

Solves a list_del corruption kernel crash when unbinding xhci-pci,
caused by xhci_mem_cleanup() when it later tried to delete already freed
endpoints from the bandwidth list.

This only affects hosts that use software bandwidth checking, which
currenty is only the xHC in intel Panther Point PCH (Ivy Bridge)
Comment 1 Alexander B 2025-10-06 11:35:39 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025100434-CVE-2022-50470-e56f@gregkh/T