CVE-2026-64348 Details
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.
A vulnerability in the Linux kernel's USB handling can lead to a memory leak in the isochronous scheduling process. This issue occurs in versions 6.13-rc1 and 7.1.1 of the Linux kernel. When an isochronous transfer is submitted, a schedule is created and temporarily stored in the 'hcpriv' field of the USB Request Block (URB) until it is linked to the endpoint queue. If the transfer submission fails before this linking occurs, the scheduled data remains attached to the URB, creating a memory leak. This vulnerability has been identified in the EHCI and FOTG210 host controller drivers, which manage USB isochronous transfers.
Users can upgrade to the patched version of the Linux kernel available in the official Linux Git repository. Instructions for downloading the latest version can be found on the Linux Kernel Archives.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://git.kernel.org/stable/c/4bb88aee6b868cbf73bf453f62497802f5fe4769 | kernel.org | Patch |
| https://git.kernel.org/stable/c/6bc17a78a05671d303820224fb37ca339c1dc2cb | kernel.org | Patch |
| https://git.kernel.org/stable/c/8890699eea19027ef6e4f9cbcf27cba5e789793f | kernel.org | Patch |
| https://git.kernel.org/stable/c/b0d00d077f9738d215af9b50c74dffab7a1de19f | kernel.org | Patch |
| https://git.kernel.org/stable/c/b9399d25fbb34a05bbe76eeedd730f62ff2670e9 | kernel.org | Patch |
| https://git.kernel.org/stable/c/be5004395dfd0b6ec310db359f887fa396fd0dd2 | kernel.org | Patch |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-416 | Use After Free | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| linux linux kernel | >= 2.6.15.1, < 5.10.261 >= 5.11, < 6.6.145 >= 6.7, < 6.12.96 >= 6.13, < 6.18.39 >= 6.19, < 7.1.4 2.6.15 - 2.6.15 rc4 2.6.15 rc5 2.6.15 rc6 2.6.15 rc7 7.2 rc1 7.2 rc2 |
CPE
Remediation
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Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 3, 2026 | Initial Analysis | [email protected] |
| Aug 17, 2026 | CVE Modified | kernel.org |
| Jul 25, 2026 | New CVE Received | kernel.org |