CVE-2026-90334
Published Sep 17, 2026
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.
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References
Other References
https://git.kernel.org/stable/c/33a44333a9dfda044b0e233399b12ead7f8a90ae
https://git.kernel.org/stable/c/4f6bd79bb7e55095f09bec9b4eb6c09df1306116
https://git.kernel.org/stable/c/5c5a795bf6248fe96f96dd9fd79d66bbb4a92077
https://git.kernel.org/stable/c/6645856f0df3aeecd45519cb611415b4b89c2223
https://git.kernel.org/stable/c/a83fcddf3c75d004f12aa13555bb73da19fb75a9
https://git.kernel.org/stable/c/d331c63570af61ef7aaf516b64a8d6f47518a3a4
https://git.kernel.org/stable/c/e9e64dd02fd68776afda00777591eca0c3984285
https://git.kernel.org/stable/c/fb1de260033c215dba438973d82b48562bdc86bb
Frequently Asked Questions
What is CVE-2026-90334? +
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.
How do I check if I'm vulnerable to CVE-2026-90334? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.