In the Linux kernel, the following vulnerability has been resolved: usb: xhci: Fix sleep in atomic context in xhci_free_streams() When a USB device… (CVE-2026-64465)
In the Linux kernel, the following vulnerability has been resolved: usb: xhci: Fix sleep in atomic context in xhci_free_streams() When a USB device with active stream endpoints is disconnected, xhci_free_streams() is called from the hub_event workqueue to free the stream resources. It calls xhci_free_stream_info() while holding xhci->lock with irqs disabled. xhci_free_stream_info() invokes xhci_free_stream_ctx(), which calls dma_free_coherent() for large stream context arrays. dma_free_coherent() can sleep (e.g. via vunmap), triggering a BUG when called from atomic context. Call trace: dma_free_attrs+0x174/0x220 xhci_free_stream_info+0xd0/0x11c xhci_free_streams+0x278/0x37c usb_free_streams+0x98/0xc0 usb_unbind_interface+0x1b8/0x2f8 device_release_driver_internal+0x1d4/0x2cc device_release_driver+0x18/0x28 bus_remove_device+0x160/0x1a4 device_del+0x1ec/0x350 usb_disable_device+0x98/0x214 usb_disconnect+0xf0/0x35c hub_event+0xab4/0x19ec process_one_work+0x278/0x63c Fix this by saving the stream_info pointers and clearing the ep references under the lock, then calling xhci_free_stream_info() outside the lock where sleeping is allowed.
AI Analysis
Technical Summary
The Linux kernel's USB xHCI driver had a vulnerability (CVE-2026-64465) where the function xhci_free_streams() called xhci_free_stream_info() while holding xhci->lock with interrupts disabled. Inside xhci_free_stream_info(), xhci_free_stream_ctx() calls dma_free_coherent(), which can sleep (e.g., via vunmap). Sleeping in atomic context triggers a kernel BUG. The fix saves stream_info pointers and clears endpoint references under the lock, then calls xhci_free_stream_info() outside the lock where sleeping is permitted.
Potential Impact
This vulnerability can cause a kernel BUG due to sleeping in atomic context, potentially leading to system instability or crashes when a USB device with active stream endpoints is disconnected. There is no indication of code execution or privilege escalation from the provided data.
Mitigation Recommendations
A fix has been implemented in the Linux kernel to address this issue by restructuring the code to avoid sleeping in atomic context. Users should apply the official kernel updates that include this patch. Since this is a kernel-level fix, upgrading to a kernel version containing this patch is the recommended remediation. Patch status is not explicitly confirmed in the provided data; check the vendor or Linux kernel advisory for the exact fixed versions and update accordingly.
In the Linux kernel, the following vulnerability has been resolved: usb: xhci: Fix sleep in atomic context in xhci_free_streams() When a USB device… (CVE-2026-64465)
Description
In the Linux kernel, the following vulnerability has been resolved: usb: xhci: Fix sleep in atomic context in xhci_free_streams() When a USB device with active stream endpoints is disconnected, xhci_free_streams() is called from the hub_event workqueue to free the stream resources. It calls xhci_free_stream_info() while holding xhci->lock with irqs disabled. xhci_free_stream_info() invokes xhci_free_stream_ctx(), which calls dma_free_coherent() for large stream context arrays. dma_free_coherent() can sleep (e.g. via vunmap), triggering a BUG when called from atomic context. Call trace: dma_free_attrs+0x174/0x220 xhci_free_stream_info+0xd0/0x11c xhci_free_streams+0x278/0x37c usb_free_streams+0x98/0xc0 usb_unbind_interface+0x1b8/0x2f8 device_release_driver_internal+0x1d4/0x2cc device_release_driver+0x18/0x28 bus_remove_device+0x160/0x1a4 device_del+0x1ec/0x350 usb_disable_device+0x98/0x214 usb_disconnect+0xf0/0x35c hub_event+0xab4/0x19ec process_one_work+0x278/0x63c Fix this by saving the stream_info pointers and clearing the ep references under the lock, then calling xhci_free_stream_info() outside the lock where sleeping is allowed.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Linux kernel's USB xHCI driver had a vulnerability (CVE-2026-64465) where the function xhci_free_streams() called xhci_free_stream_info() while holding xhci->lock with interrupts disabled. Inside xhci_free_stream_info(), xhci_free_stream_ctx() calls dma_free_coherent(), which can sleep (e.g., via vunmap). Sleeping in atomic context triggers a kernel BUG. The fix saves stream_info pointers and clears endpoint references under the lock, then calls xhci_free_stream_info() outside the lock where sleeping is permitted.
Potential Impact
This vulnerability can cause a kernel BUG due to sleeping in atomic context, potentially leading to system instability or crashes when a USB device with active stream endpoints is disconnected. There is no indication of code execution or privilege escalation from the provided data.
Mitigation Recommendations
A fix has been implemented in the Linux kernel to address this issue by restructuring the code to avoid sleeping in atomic context. Users should apply the official kernel updates that include this patch. Since this is a kernel-level fix, upgrading to a kernel version containing this patch is the recommended remediation. Patch status is not explicitly confirmed in the provided data; check the vendor or Linux kernel advisory for the exact fixed versions and update accordingly.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-5wmv-5wg4-7mv5
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-64465"]
- Ecosystems
- []
- Database Specific Severity
- null
- Cvss Version
- null
Threat ID: 6a6542079c2644c7f80829cb
Added to database: 07/25/2026, 23:08:55 UTC
Last enriched: 07/25/2026, 23:18:29 UTC
Last updated: 09/07/2026, 10:52:10 UTC
Views: 53
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