CVE-2026-64345 usb: gadget: f_printer: take kref only for successful open

What is CVE-2026-64345?

CVE-2026-64345 is a medium-severity denial of service 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: gadget: f_printer: take kref only for successful open

printer_open() returns -EBUSY when the character device is already open, but it increments dev->kref regardless of the return value. VFS does not call ->release() for a failed open, so every rejected second open permanently leaks one reference.

Move kref_get() into the successful-open branch.

Which versions are affected by CVE-2026-64345?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2026-64345?

Apply the vendor's patch.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2026-64345 being exploited?

There is no known exploitation of CVE-2026-64345 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BELL-CVE-2026-64345, DEBIAN-CVE-2026-64345, GHSA-j7g9-89xm-vfhf, ROOT-OS-UBUNTU-2204-CVE-2026-64345, UBUNTU-CVE-2026-64345.