---
id: CVE-2026-90334
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  tty: clear cdev pointer after cdev_add() failure

  tty_cdev_add() drops the cdev reference when cdev_add() fails, but
  leaves driver->cdevs[index] pointing to freed memor…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  tty: clear cdev pointer after cdev_add() failure

  tty_cdev_add() drops the cdev reference when cdev_add() fails, but
  leaves driver->cdevs[index] pointing to freed memor…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= c1a752ba2d6b8a52879c7ab637cff38359ea9827 <
    fb1de260033c215dba438973d82b48562bdc86bb
  - >-
    Linux >= c1a752ba2d6b8a52879c7ab637cff38359ea9827 <
    e9e64dd02fd68776afda00777591eca0c3984285
  - >-
    Linux >= c1a752ba2d6b8a52879c7ab637cff38359ea9827 <
    33a44333a9dfda044b0e233399b12ead7f8a90ae
  - >-
    Linux >= c1a752ba2d6b8a52879c7ab637cff38359ea9827 <
    d331c63570af61ef7aaf516b64a8d6f47518a3a4
  - >-
    Linux >= c1a752ba2d6b8a52879c7ab637cff38359ea9827 <
    a83fcddf3c75d004f12aa13555bb73da19fb75a9
  - >-
    Linux >= c1a752ba2d6b8a52879c7ab637cff38359ea9827 <
    4f6bd79bb7e55095f09bec9b4eb6c09df1306116
  - >-
    Linux >= c1a752ba2d6b8a52879c7ab637cff38359ea9827 <
    5c5a795bf6248fe96f96dd9fd79d66bbb4a92077
  - >-
    Linux >= c1a752ba2d6b8a52879c7ab637cff38359ea9827 <
    6645856f0df3aeecd45519cb611415b4b89c2223
  - Linux 4.3
published: '2026-09-17'
updated: '2026-09-17'
sourceUpdated: '2026-09-17T17:17:31.937'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-90334'
references:
  - url: 'https://git.kernel.org/stable/c/33a44333a9dfda044b0e233399b12ead7f8a90ae'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/4f6bd79bb7e55095f09bec9b4eb6c09df1306116'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/5c5a795bf6248fe96f96dd9fd79d66bbb4a92077'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/6645856f0df3aeecd45519cb611415b4b89c2223'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/a83fcddf3c75d004f12aa13555bb73da19fb75a9'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/d331c63570af61ef7aaf516b64a8d6f47518a3a4'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/e9e64dd02fd68776afda00777591eca0c3984285'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/fb1de260033c215dba438973d82b48562bdc86bb'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-17T16:21:47.819Z'
epss: 0.0021
epssPercentile: 0.11551
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

tty: clear cdev pointer after cdev_add() failure

tty_cdev_add() drops the cdev reference when cdev_add() fails, but
leaves driver->cdevs[index] pointing to freed memory.
tty_unregister_device() later passes that stale pointer to cdev_del(),
causing a use-after-free.

Clear the slot after dropping the reference.

## Remediation

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