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CVE-2022-49915: mISDN: fix possible memory leak in mISDN_register_device()

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-05-01 · updated 2026-06-17
• Weakness: CWE-401

Description

In the Linux kernel, the following vulnerability has been resolved: mISDN: fix possible memory leak in mISDN_register_device() Afer commit 1fa5ae857bb1 ("driver core: get rid of struct device's bus_id string array"), the name of device is allocated dynamically, add put_device() to give up the reference, so that the name can be freed in kobject_cleanup() when the refcount is 0. Set device class before put_device() to avoid null release() function WARN message in device_release().

Affected products

• Linux kernel: from 2.6.30 before 4.9.333; from 4.10 before 4.14.299; from 4.15 before 4.19.265; from 4.20 before 5.4.224; from 5.5 before 5.10.154; from 5.11 before 5.15.78 — fixed in 4.14.299, 4.19.265, 4.9.333, 5.10.154, 5.15.78, 5.4.224

How to fix

Upgrade to a fixed version: Linux kernel 4.14.299, 4.19.265, 4.9.333, 5.10.154. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/029d5b7688a2f3a86f2a3be5a6ba9cc968c80e41
• https://git.kernel.org/stable/c/080aabfb29b2ee9cbb8894a1d039651943d3773e
• https://git.kernel.org/stable/c/0d4e91efcaee081e919b3c50e875ecbb84290e41
• https://git.kernel.org/stable/c/2ff6b669523d3b3d253a044fa9636a67d0694995
• https://git.kernel.org/stable/c/a636fc5a7cabd05699b5692ad838c2c7a3abec7b
• https://git.kernel.org/stable/c/d1d1aede313eb2b9a84afd60ff6cfb7c33631e0e
• https://git.kernel.org/stable/c/e77d213843e67b4373285712699b692f9c743f61
• https://git.kernel.org/stable/c/e7d1d4d9ac0dfa40be4c2c8abd0731659869b297

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