CVE WatchSep 3, 2026

CVE-2026-64348

In the Linux kernel, the following vulnerability has been resolved: usb: free iso schedules on failed submit EHCI and FOTG210 isochronous

CVSS

7.8

High

EPSS

0.1%

KEV

—

Exploit Today

0-100

Published: Jul 25, 2026 · Last modified: Sep 3, 2026 · CWE-416

EPSS · 30d

0.1%EPSS · 30 days0.1%

2026-09-272026-10-25

Technical 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.

Official references

Related CVEs

CVECVSSEPSSKEVRExploitTitleMod.

CVE-2026-823885.3 MED

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42.6%

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13.6%

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