CVE-2026-64348 usb: free iso schedules on failed submit
A use-after-free vulnerability in the Linux kernel USB subsystem allows attackers to cause denial of service or potentially execute code via failed isochronous submits.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-64348?
CVE-2026-64348 is a high-severity use after free vulnerability in Linux kernel, published on 25 Jul 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Weakness: CWE-416
Which versions are affected by CVE-2026-64348?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-64348?
Apply the vendor's patch.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2026-64348 being exploited?
There is no known exploitation of CVE-2026-64348 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-93794, BELL-CVE-2026-64348, DEBIAN-CVE-2026-64348, GHSA-c2pf-rr3m-qvwf, ROOT-OS-UBUNTU-2204-CVE-2026-64348, UBUNTU-CVE-2026-64348.