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

High 7.8 EPSS 0.1% Linux kernel

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.

CVE-2026-64348CVE identifier
7.8CVSS 3.1 base score (high)
0.1%EPSS: chance of exploitation in the next 30 days (higher than 3% of CVEs)
2026-07-25published

What do these terms mean? CVE · CVSS score · exploited (KEV) · EPSS · backported fix · all terms

What to do now

Check whether you run Linux kernel and which version (commands below).
Install the fixed version for your system: see “Patch it” below.
Reboot into the new kernel (uname -r to confirm); live patching (kpatch, Ubuntu Livepatch, SUSE kGraft/klp) can defer the reboot for some CVEs

Affected and fixed versions

Affected:

Linux Linux 8de98402652c01839ae321be6cb3054cf5735d83 to before b0d00d077f9738d215af9b50c74dffab7a1de19f
Linux Linux 8de98402652c01839ae321be6cb3054cf5735d83 to before ab12316c4639237cc9d50c80a0c6240f11fbba3f
Linux Linux 8de98402652c01839ae321be6cb3054cf5735d83 to before be5004395dfd0b6ec310db359f887fa396fd0dd2
Linux Linux 8de98402652c01839ae321be6cb3054cf5735d83 to before 8890699eea19027ef6e4f9cbcf27cba5e789793f
Linux Linux 8de98402652c01839ae321be6cb3054cf5735d83 to before 6bc17a78a05671d303820224fb37ca339c1dc2cb
Linux Linux 8de98402652c01839ae321be6cb3054cf5735d83 to before 4bb88aee6b868cbf73bf453f62497802f5fe4769
Linux Linux 8de98402652c01839ae321be6cb3054cf5735d83 to before b9399d25fbb34a05bbe76eeedd730f62ff2670e9
Linux Linux 2.6.15

Patch it

Use the commands for your system. Distribution packages often keep an older version number with the fix backported, so compare with the fixed package versions in the table below, not only with the upstream version.

Debian

sudo apt update
sudo apt install --only-upgrade linux-image-amd64

Ubuntu

sudo apt update
sudo apt install --only-upgrade linux-image-generic (or the installed flavour: linux-image-aws, -azure, -gcp, -virtual)

RHEL, AlmaLinux, Rocky, Oracle

sudo dnf upgrade --refresh kernel

Fedora

sudo dnf upgrade --refresh kernel

SUSE / openSUSE

sudo zypper refresh
sudo zypper update kernel-default

Amazon Linux

sudo dnf upgrade --releasever=latest kernel kernel6.12

Arch Linux

sudo pacman -Syu

Alpine

apk update && apk upgrade linux-lts linux-virt

FreeBSD

not Linux

General update steps for every system are on the Linux and Unix & BSD pages; after updating, see which services to restart.

Fix status in Linux distributions

Release	Package	Status	Fixed version / advisory
Debian 12	`linux`	not fixed yet
Debian 13	`linux`	fixed	`6.12.96-1`
Debian testing	`linux`	fixed	`7.1.4-1`
Debian 12	`linux-6.12`	fixed	`6.12.100-1~deb12u1`

From the Debian security tracker, Ubuntu CVE tracker and Red Hat Security Data API, refreshed every few hours.

Sources

Page generated automatically from official sources on 2026-11-03 18:05 UTC. Always confirm with your vendor's advisory.