CVE-2026-64348: usb: free iso schedules on failed submit
In the Linux kernel, the following vulnerability has been resolved:
usb: free iso schedules on failed submit
EHCI and FOTG210 isochronous submits build an ehciisosched before linking the URB to the endpoint queue, and keep the staged schedule in urb->hcpriv until isostreamschedule() and the link helpers consume it. If the controller is no longer accessible, or usbhcdlinkurbtoep() fails, submit jumps to donenotlinked before that handoff happens and leaks the staged schedule still attached to urb->hcpriv.
Free the staged schedule from donenotlinked 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 x8664 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 Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 6.6.145.2-1 - Upgrade
Upgrade
Linux kernelto a version that resolves this vulnerability.Fixed in v6.13-rc1
Event History
Frequently Asked Questions
What is the severity of CVE-2026-64348?
The severity of CVE-2026-64348 is medium with a CVSS score of 5.5.
How do I fix CVE-2026-64348?
To mitigate CVE-2026-64348, update the Linux kernel to the latest patched version that addresses this vulnerability.
What type of systems are affected by CVE-2026-64348?
CVE-2026-64348 affects the Linux kernel and specifically systems using the EHCI and FOTG210 drivers for USB.
What does CVE-2026-64348 vulnerability impact?
CVE-2026-64348 can lead to denial of service by allowing failures in isochronous USB submits.
When was CVE-2026-64348 published?
CVE-2026-64348 was published on July 25, 2026.