Description
In the Linux kernel, the following vulnerability has been resolved: usb: free iso schedules on failed submit EHCI and FOTG210 isochronous submits build an ehci_iso_sched before linking the URB to the endpoint queue, and keep the staged schedule in urb->hcpriv until iso_stream_schedule() and the link helpers consume it. If the controller is no longer accessible, or usb_hcd_link_urb_to_ep() fails, submit jumps to done_not_linked before that handoff happens and leaks the staged schedule still attached to urb->hcpriv. Free the staged schedule from done_not_linked when submit fails before the URB is linked and clear urb->hcpriv after the free. The bug was first flagged by an experimental analysis tool we are developing for kernel memory-management bugs while analyzing v6.13-rc1. The tool is still under development and is not yet publicly available. Manual inspection confirms that the bug is still present in v7.1.1. An x86_64 allyesconfig build showed no new warnings. As we do not have an EHCI host controller with a USB isochronous device to test with, no runtime testing was able to be performed.
Affected products
linux: linux kernel
References7
- git.kernel.org/stable/c/4bb88aee6b868cbf73bf453f62497802f5fe4769 Patch
- git.kernel.org/stable/c/6bc17a78a05671d303820224fb37ca339c1dc2cb Patch
- git.kernel.org/stable/c/8890699eea19027ef6e4f9cbcf27cba5e789793f Patch
- git.kernel.org/stable/c/b0d00d077f9738d215af9b50c74dffab7a1de19f Patch
- git.kernel.org/stable/c/b9399d25fbb34a05bbe76eeedd730f62ff2670e9 Patch
- git.kernel.org/stable/c/be5004395dfd0b6ec310db359f887fa396fd0dd2 Patch
- git.kernel.org/stable/c/ab12316c4639237cc9d50c80a0c6240f11fbba3f
Metrics
- CVSS 3.1
-
7.8
HIGH
Score source: NVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H - EPSS — exploit probability
- 0% percentile: 3 · as of 14 November 2026
- CWE
- CWE-416
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