Bug 2477084 (CVE-2026-43488)

Summary: CVE-2026-43488 kernel: usb: xhci: Prevent interrupt storm on host controller error (HCE)
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
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Priority: low    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's xHCI (eXtensible Host Controller Interface) driver. When a USB Attached SCSI (UAS) storage device is connected or disconnected, the xHCI controller can report a Host Controller Error (HCE). Improper handling of this error can lead to an interrupt storm, causing severe system-level faults and a Denial of Service (DoS).
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Description OSIDB Bzimport 2026-05-13 16:03:13 UTC 
In the Linux kernel, the following vulnerability has been resolved:

usb: xhci: Prevent interrupt storm on host controller error (HCE)

The xHCI controller reports a Host Controller Error (HCE) in UAS Storage
Device plug/unplug scenarios on Android devices. HCE is checked in
xhci_irq() function and causes an interrupt storm (since the interrupt
isn’t cleared), leading to severe system-level faults.

When the xHC controller reports HCE in the interrupt handler, the driver
only logs a warning and assumes xHC activity will stop as stated in xHCI
specification. An interrupt storm does however continue on some hosts
even after HCE, and only ceases after manually disabling xHC interrupt
and stopping the controller by calling xhci_halt().

Add xhci_halt() to xhci_irq() function where STS_HCE status is checked,
mirroring the existing error handling pattern used for STS_FATAL errors.

This only fixes the interrupt storm. Proper HCE recovery requires resetting
and re-initializing the xHC.
Comment 1 Keith Grant 2026-05-13 17:05:37 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026051350-CVE-2026-43488-ebef@gregkh/T