Linux Kernel up to 6.5.2 alloc_midi_urbs initialization

Summaryinfo

A vulnerability marked as critical has been reported in Linux Kernel up to 6.5.2. This affects the function alloc_midi_urbs. Performing a manipulation results in initialization. This vulnerability is identified as CVE-2023-54022. There is not any exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.5.2. It has been classified as critical. This affects the function alloc_midi_urbs. The manipulation with an unknown input leads to a initialization vulnerability. CWE is classifying the issue as CWE-665. The product does not initialize or incorrectly initializes a resource, which might leave the resource in an unexpected state when it is accessed or used. This is going to have an impact on availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: ALSA: usb-audio: Fix potential memory leaks at error path for UMP open The allocation and initialization errors at alloc_midi_urbs() that is called at MIDI 2.0 / UMP device are supposed to be handled at the caller side by invoking free_midi_urbs(). However, free_midi_urbs() loops only for ep->num_urbs entries, and since ep->num_entries wasn't updated yet at the allocation / init error in alloc_midi_urbs(), this entry won't be released. The intention of free_midi_urbs() is to release the whole elements, so change the loop size to NUM_URBS to scan over all elements for fixing the missed releases. Also, the call of free_midi_urbs() is missing at snd_usb_midi_v2_open(). Although it'll be released later at reopen/close or disconnection, it's better to release immediately at the error path.

The advisory is shared at git.kernel.org. This vulnerability is uniquely identified as CVE-2023-54022 since 12/24/2025. Technical details are known, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 279967 (Linux Distros Unpatched Vulnerability : CVE-2023-54022), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.5.3 eliminates this vulnerability. Applying the patch f819b343aa95d24d5f7d6e06660c7f62591abc5f/b1757fa30ef14f254f4719bf6f7d54a4c8207216 is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (279967) and CERT Bund (WID-SEC-2025-2920). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Affected

• Open Source Linux Kernel

Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 6.5.0
• 6.5.1
• 6.5.2

License

• open-source

Website

• Vendor: https://www.kernel.org/

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