# CVE-2022-49821: mISDN: fix possible memory leak in mISDN_dsp_element_register()

Status: published. Published: 2025-05-01. Updated: 2026-11-05.

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.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Linux / Linux: ≥ 1fa5ae857bb14f6046205171d98506d8112dd74e; < bbd53d05c4c892080ef3b617eff4f57903acecb9 (affected, git); ≥ 1fa5ae857bb14f6046205171d98506d8112dd74e; < b119bedbefb7dd9ed8bf8cb9f1056504250d610e (affected, git); ≥ 1fa5ae857bb14f6046205171d98506d8112dd74e; < 727ed7d28348c026c7ef4d852f3d0e5054d376e8 (affected, git); ≥ 1fa5ae857bb14f6046205171d98506d8112dd74e; < 0f2c681900a01e3f23789bca26d88268c3d5b51d (affected, git); ≥ 1fa5ae857bb14f6046205171d98506d8112dd74e; < 083a2c9ef82e184bdf0b9f9a1e5fc38d32afbb47 (affected, git); ≥ 1fa5ae857bb14f6046205171d98506d8112dd74e; < 7a05e3929668c8cfef495c69752a9e91fac4878f (affected, git); ≥ 1fa5ae857bb14f6046205171d98506d8112dd74e; < d4b8394725079670be309f9a35ad88a8cbbaaefd (affected, git); ≥ 1fa5ae857bb14f6046205171d98506d8112dd74e; < 98a2ac1ca8fd6eca6867726fe238d06e75eb1acd (affected, git). Source: CNA: Linux
- Linux / Linux: 2.6.30 (affected); ≥ 0; < 2.6.30 (unaffected, semver); ≥ 4.9.334; ≤ 4.9.* (unaffected, semver); ≥ 4.14.300; ≤ 4.14.* (unaffected, semver); ≥ 4.19.267; ≤ 4.19.* (unaffected, semver); ≥ 5.4.225; ≤ 5.4.* (unaffected, semver); ≥ 5.10.156; ≤ 5.10.* (unaffected, semver); ≥ 5.15.80; ≤ 5.15.* (unaffected, semver); ≥ 6.0.10; ≤ 6.0.* (unaffected, semver); ≥ 6.1; ≤ * (unaffected, original_commit_for_fix). Source: CNA: Linux

## Severity and prioritization

- CISA KEV: No listing in collected sources

- EPSS: 0.20% as of 2026-11-05; percentile 10.28%

- SSVC: exploitation none; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: Not reported

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://git.kernel.org/stable/c/bbd53d05c4c892080ef3b617eff4f57903acecb9 (CNA: Linux)

- https://git.kernel.org/stable/c/b119bedbefb7dd9ed8bf8cb9f1056504250d610e (CNA: Linux)

- https://git.kernel.org/stable/c/727ed7d28348c026c7ef4d852f3d0e5054d376e8 (CNA: Linux)

- https://git.kernel.org/stable/c/0f2c681900a01e3f23789bca26d88268c3d5b51d (CNA: Linux)

- https://git.kernel.org/stable/c/083a2c9ef82e184bdf0b9f9a1e5fc38d32afbb47 (CNA: Linux)

- https://git.kernel.org/stable/c/7a05e3929668c8cfef495c69752a9e91fac4878f (CNA: Linux)

- https://git.kernel.org/stable/c/d4b8394725079670be309f9a35ad88a8cbbaaefd (CNA: Linux)

- https://git.kernel.org/stable/c/98a2ac1ca8fd6eca6867726fe238d06e75eb1acd (CNA: Linux)

## Provenance

- CNA: Linux: https://www.cve.org/CVERecord?id=CVE-2022-49821; retrieved 2026-11-05; source updated 2026-11-05

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2022-49821; retrieved 2026-11-05; source updated Not reported

Revision: b655b611781c4971af2f18dc2acde65f9e676b614cbae2e62db29df307b30db1

Canonical: https://y2.dev/cve/CVE-2022-49821

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