---
id: CVE-2026-64345
title: 'usb: gadget: f_printer: take kref only for successful open'
summary: |-
  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 regardl…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= e8d5f92b8d30bb4ade76494490c3c065e12411b1 <
    94ec20d97aa51547965a539f660a1fe79c6929a3
  - >-
    Linux >= e8d5f92b8d30bb4ade76494490c3c065e12411b1 <
    a12d81a9cc2a012a24ecb7f9ba076b9f7c179bd3
  - >-
    Linux >= e8d5f92b8d30bb4ade76494490c3c065e12411b1 <
    75c0ad13e136961328253742501b4efc3988a587
  - >-
    Linux >= e8d5f92b8d30bb4ade76494490c3c065e12411b1 <
    bf20c94fa6aaff945f0ae3a23f3212cd299f28d9
  - >-
    Linux >= e8d5f92b8d30bb4ade76494490c3c065e12411b1 <
    8a5eba992c862b0c94411eecf9b7121e8636db38
  - >-
    Linux >= e8d5f92b8d30bb4ade76494490c3c065e12411b1 <
    7f1f24c367938c5537e2308bf9a965f051d14774
  - >-
    Linux >= e8d5f92b8d30bb4ade76494490c3c065e12411b1 <
    30adce93d5c4a5a1ec29d9249e3fdfcc391d406b
  - Linux 25c95c6bd4dc50a3c20de0fa7f450ea02b2320fc
  - Linux 4a47581cf010dc351d8069978080fdb000c0776d
  - Linux d9fe88b2a38dc700bf5bd3a09c7cd11bbc248367
  - Linux cedb0187b8ba929c3f76f28e6bc25804d65f8a54
  - Linux e9e791f5c39ab30e374a3b1a9c25ca7ff24988f3
  - Linux 34f026263889e2827e04acdc3a0eb9ecbd191ef0
  - Linux 5f845e5d18d151230476cf90aa46449f69ba2ef1
  - Linux >= 4.4.241 < 4.5
  - Linux >= 4.9.241 < 4.10
  - Linux >= 4.14.203 < 4.15
  - Linux >= 4.19.154 < 4.20
  - Linux >= 5.4.73 < 5.5
  - Linux >= 5.8.17 < 5.9
  - Linux >= 5.9.2 < 5.10
  - Linux 5.10
published: '2026-07-25'
updated: '2026-10-30'
sourceUpdated: '2026-10-30T12:27:47.119Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-64345'
references:
  - url: 'https://git.kernel.org/stable/c/94ec20d97aa51547965a539f660a1fe79c6929a3'
  - url: 'https://git.kernel.org/stable/c/a12d81a9cc2a012a24ecb7f9ba076b9f7c179bd3'
  - url: 'https://git.kernel.org/stable/c/75c0ad13e136961328253742501b4efc3988a587'
  - url: 'https://git.kernel.org/stable/c/bf20c94fa6aaff945f0ae3a23f3212cd299f28d9'
  - url: 'https://git.kernel.org/stable/c/8a5eba992c862b0c94411eecf9b7121e8636db38'
  - url: 'https://git.kernel.org/stable/c/7f1f24c367938c5537e2308bf9a965f051d14774'
  - url: 'https://git.kernel.org/stable/c/30adce93d5c4a5a1ec29d9249e3fdfcc391d406b'
tags:
  - cve.org
epss: 0.00123
epssPercentile: 0.02045
ingestedAt: '2026-11-05T15:02:32.422Z'
---

## Overview

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.

## Affected

- `Linux >= e8d5f92b8d30bb4ade76494490c3c065e12411b1 < 94ec20d97aa51547965a539f660a1fe79c6929a3`
- `Linux >= e8d5f92b8d30bb4ade76494490c3c065e12411b1 < a12d81a9cc2a012a24ecb7f9ba076b9f7c179bd3`
- `Linux >= e8d5f92b8d30bb4ade76494490c3c065e12411b1 < 75c0ad13e136961328253742501b4efc3988a587`
- `Linux >= e8d5f92b8d30bb4ade76494490c3c065e12411b1 < bf20c94fa6aaff945f0ae3a23f3212cd299f28d9`
- `Linux >= e8d5f92b8d30bb4ade76494490c3c065e12411b1 < 8a5eba992c862b0c94411eecf9b7121e8636db38`
- `Linux >= e8d5f92b8d30bb4ade76494490c3c065e12411b1 < 7f1f24c367938c5537e2308bf9a965f051d14774`
- `Linux >= e8d5f92b8d30bb4ade76494490c3c065e12411b1 < 30adce93d5c4a5a1ec29d9249e3fdfcc391d406b`
- `Linux 25c95c6bd4dc50a3c20de0fa7f450ea02b2320fc`
- `Linux 4a47581cf010dc351d8069978080fdb000c0776d`
- `Linux d9fe88b2a38dc700bf5bd3a09c7cd11bbc248367`
- `Linux cedb0187b8ba929c3f76f28e6bc25804d65f8a54`
- `Linux e9e791f5c39ab30e374a3b1a9c25ca7ff24988f3`
- `Linux 34f026263889e2827e04acdc3a0eb9ecbd191ef0`
- `Linux 5f845e5d18d151230476cf90aa46449f69ba2ef1`
- `Linux >= 4.4.241 < 4.5`
- `Linux >= 4.9.241 < 4.10`
- `Linux >= 4.14.203 < 4.15`
- `Linux >= 4.19.154 < 4.20`
- `Linux >= 5.4.73 < 5.5`
- `Linux >= 5.8.17 < 5.9`
- `Linux >= 5.9.2 < 5.10`
- `Linux 5.10`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.