CVE-2022-49821

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

mISDN: fix possible memory leak in mISDN_dsp_element_register()

Afer commit 1fa5ae857bb1 ("driver core: get rid of struct device's bus_id string array"), the name of device is allocated dynamically, use put_device() to give up the reference, so that the name can be freed in kobject_cleanup() when the refcount is 0.

The 'entry' is going to be freed in mISDN_dsp_dev_release(), so the kfree() is removed. list_del() is called in mISDN_dsp_dev_release(), so it need be initialized.

This issue in mISDN_dsp_element_register() results in a memory leak if device registration fails, due to improper reference handling. It can only be triggered by a privileged user (CAP_SYS_ADMIN or kernel-space component), since registering new DSP elements in the mISDN subsystem requires access to kernel interfaces unavailable to unprivileged users.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.