CVE-2026-64465

usb: xhci: Fix sleep in atomic context in xhci_free_streams()

State: Published
Severity: Not scored
Published: Jul 25, 2026
Updated: Aug 17, 2026
Reserved: Jul 19, 2026

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	8df75f42f8e67e2851cdcf6da91640fb881defd1 to before e623e4a203f56d5c57519a9a3cb29600551534adAffected 8df75f42f8e67e2851cdcf6da91640fb881defd1 to before d107eb316144c5fb958486e7fe604cd7f1b35cdaAffected 8df75f42f8e67e2851cdcf6da91640fb881defd1 to before 1e45aa722c4ce5663e987102aac18c8ad6a83fddAffected 8df75f42f8e67e2851cdcf6da91640fb881defd1 to before 10666ac9c552990204e791af653abf8e9d9ff619Affected 8df75f42f8e67e2851cdcf6da91640fb881defd1 to before f7b022ae07685e7526fc39f387ce65b5d309dd3bAffected 8df75f42f8e67e2851cdcf6da91640fb881defd1 to before f90586129cf9e1fbdb718ef602eea3f15dc1c31cAffected 8df75f42f8e67e2851cdcf6da91640fb881defd1 to before 93cd037da94fcb93183bfb2457e3a56d3eb4c8f4Affected 8df75f42f8e67e2851cdcf6da91640fb881defd1 to before 42c37c4b75d38b51d84f31a8e29427f5e06a7c2aAffected
LinuxLinux	2.6.35Affected before 2.6.35Not affected 5.10.261 through 5.10.Not affected 5.15.212 through 5.15.Not affected 6.1.178 through 6.1.Not affected 6.6.145 through 6.6.Not affected 6.12.96 through 6.12.Not affected 6.18.39 through 6.18.Not affected 7.1.4 through 7.1.*Not affected 7.2 and laterNot affected

Product

Versions

LinuxLinux

8df75f42f8e67e2851cdcf6da91640fb881defd1 to before e623e4a203f56d5c57519a9a3cb29600551534adAffected
8df75f42f8e67e2851cdcf6da91640fb881defd1 to before d107eb316144c5fb958486e7fe604cd7f1b35cdaAffected
8df75f42f8e67e2851cdcf6da91640fb881defd1 to before 1e45aa722c4ce5663e987102aac18c8ad6a83fddAffected
8df75f42f8e67e2851cdcf6da91640fb881defd1 to before 10666ac9c552990204e791af653abf8e9d9ff619Affected
8df75f42f8e67e2851cdcf6da91640fb881defd1 to before f7b022ae07685e7526fc39f387ce65b5d309dd3bAffected
8df75f42f8e67e2851cdcf6da91640fb881defd1 to before f90586129cf9e1fbdb718ef602eea3f15dc1c31cAffected
8df75f42f8e67e2851cdcf6da91640fb881defd1 to before 93cd037da94fcb93183bfb2457e3a56d3eb4c8f4Affected
8df75f42f8e67e2851cdcf6da91640fb881defd1 to before 42c37c4b75d38b51d84f31a8e29427f5e06a7c2aAffected

LinuxLinux

2.6.35Affected
before 2.6.35Not affected
5.10.261 through 5.10.*Not affected
5.15.212 through 5.15.*Not affected
6.1.178 through 6.1.*Not affected
6.6.145 through 6.6.*Not affected
6.12.96 through 6.12.*Not affected
6.18.39 through 6.18.*Not affected
7.1.4 through 7.1.*Not affected
7.2 and laterNot affected

References

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