CVE-2026-64348

usb: free iso schedules on failed submit

HIGH

7.8

CVSS Score

Published: July 25, 2026 at 08:50 AM UTC

Updated: September 3, 2026 at 04:24 PM UTC

1 product affected across 1 vendorLinux Kernel

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Severity

HIGH7.8

Exploit prediction

EPSS 0.1%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel · Linux

95%

2.6.15 ≤ v < 5.10.2612.6.15 ≤ v < 6.12.962.6.15 ≤ v < 6.18.392.6.15 ≤ v < 6.6.1452.6.15 ≤ v < 7.1.42.6.15 ≤ v < 7.22.6.15.1 ≤ v < 5.10.2615.11 ≤ v < 6.6.1456.13 ≤ v < 6.18.396.19 ≤ v < 7.1.46.7 ≤ v < 6.12.962.6.15 2.6.15 rc4 2.6.15 rc5 2.6.15 rc6 2.6.15 rc7 7.2 rc1 7.2 rc28de98402652c01839ae321be6cb3054cf5735d83

Vendor states this is fixed in 4bb88aee6b868cbf73bf453f62497802f5fe4769 (fixed)

Vendor states this is fixed in 6bc17a78a05671d303820224fb37ca339c1dc2cb (fixed)

Vendor states this is fixed in 8890699eea19027ef6e4f9cbcf27cba5e789793f (fixed)

Vendor states this is fixed in b0d00d077f9738d215af9b50c74dffab7a1de19f (fixed)

Vendor states this is fixed in b9399d25fbb34a05bbe76eeedd730f62ff2670e9 (fixed)

Vendor states this is fixed in be5004395dfd0b6ec310db359f887fa396fd0dd2 (fixed)

Vendor states this is fixed in 2.6.15 (unaffected)

Vendor states this is fixed in 5.10.261 (unaffected)

Vendor states this is fixed in 6.12.96 (unaffected)

Vendor states this is fixed in 6.18.39 (unaffected)

Vendor states this is fixed in 6.6.145 (unaffected)

Vendor states this is fixed in 7.1.4 (unaffected)