CVE-2026-90334
tty: clear cdev pointer after cdev_add() failure
Description
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.
INFO
Published Date :
Sept. 17, 2026, 5:17 p.m.
Last Modified :
Sept. 17, 2026, 5:17 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Solution
- Clear the cdev pointer after cdev_add() fails.
- Ensure cdev_del() receives a valid pointer.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-90334.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-90334 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-90334
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-90334 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-90334 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Sep. 17, 2026
Action Type Old Value New Value Added Description 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. Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/90xxx/CVE-2026-90334.json">CVE-2026-90334</a> Added Reference https://git.kernel.org/stable/c/33a44333a9dfda044b0e233399b12ead7f8a90ae Added Reference https://git.kernel.org/stable/c/4f6bd79bb7e55095f09bec9b4eb6c09df1306116 Added Reference https://git.kernel.org/stable/c/5c5a795bf6248fe96f96dd9fd79d66bbb4a92077 Added Reference https://git.kernel.org/stable/c/6645856f0df3aeecd45519cb611415b4b89c2223 Added Reference https://git.kernel.org/stable/c/a83fcddf3c75d004f12aa13555bb73da19fb75a9 Added Reference https://git.kernel.org/stable/c/d331c63570af61ef7aaf516b64a8d6f47518a3a4 Added Reference https://git.kernel.org/stable/c/e9e64dd02fd68776afda00777591eca0c3984285 Added Reference https://git.kernel.org/stable/c/fb1de260033c215dba438973d82b48562bdc86bb