CVE-2026-64348

usb: free iso schedules on failed submit

State: Published
Severity: Not scored
Published: Jul 25, 2026
Updated: Oct 30, 2026
Reserved: Jul 19, 2026

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	8de98402652c01839ae321be6cb3054cf5735d83 to before b0d00d077f9738d215af9b50c74dffab7a1de19fAffected 8de98402652c01839ae321be6cb3054cf5735d83 to before ab12316c4639237cc9d50c80a0c6240f11fbba3fAffected 8de98402652c01839ae321be6cb3054cf5735d83 to before be5004395dfd0b6ec310db359f887fa396fd0dd2Affected 8de98402652c01839ae321be6cb3054cf5735d83 to before 8890699eea19027ef6e4f9cbcf27cba5e789793fAffected 8de98402652c01839ae321be6cb3054cf5735d83 to before 6bc17a78a05671d303820224fb37ca339c1dc2cbAffected 8de98402652c01839ae321be6cb3054cf5735d83 to before 4bb88aee6b868cbf73bf453f62497802f5fe4769Affected 8de98402652c01839ae321be6cb3054cf5735d83 to before b9399d25fbb34a05bbe76eeedd730f62ff2670e9Affected
LinuxLinux	2.6.15Affected before 2.6.15Not affected 5.10.261 through 5.10.Not affected 6.1.191 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

8de98402652c01839ae321be6cb3054cf5735d83 to before b0d00d077f9738d215af9b50c74dffab7a1de19fAffected
8de98402652c01839ae321be6cb3054cf5735d83 to before ab12316c4639237cc9d50c80a0c6240f11fbba3fAffected
8de98402652c01839ae321be6cb3054cf5735d83 to before be5004395dfd0b6ec310db359f887fa396fd0dd2Affected
8de98402652c01839ae321be6cb3054cf5735d83 to before 8890699eea19027ef6e4f9cbcf27cba5e789793fAffected
8de98402652c01839ae321be6cb3054cf5735d83 to before 6bc17a78a05671d303820224fb37ca339c1dc2cbAffected
8de98402652c01839ae321be6cb3054cf5735d83 to before 4bb88aee6b868cbf73bf453f62497802f5fe4769Affected
8de98402652c01839ae321be6cb3054cf5735d83 to before b9399d25fbb34a05bbe76eeedd730f62ff2670e9Affected

LinuxLinux

2.6.15Affected
before 2.6.15Not affected
5.10.261 through 5.10.*Not affected
6.1.191 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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