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CVE-2026-90021

Unknown

Last modified

CVE-2026-90021 is a vulnerability of currently unknown severity. In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_midi: initialize work in f_midi_alloc() f_midi_alloc initializes free_ref to 1 and it can only be incremented when a sound card is registered via f_midi_register_card(). f_midi_register_card() is only called in f_midi_bind() which actually performs INIT_WORK. If f_midi_bind() is never run, work is not initialized and the if condition in f_midi_free becomes true, this results in a warning later in __flush_work as work->func = 0. Fix this by moving INIT_WORK from f_midi_bind() to f_midi_alloc()..

Description

In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_midi: initialize work in f_midi_alloc() f_midi_alloc initializes free_ref to 1 and it can only be incremented when a sound card is registered via f_midi_register_card(). f_midi_register_card() is only called in f_midi_bind() which actually performs INIT_WORK. If f_midi_bind() is never run, work is not initialized and the if condition in f_midi_free becomes true, this results in a warning later in __flush_work as work->func = 0. Fix this by moving INIT_WORK from f_midi_bind() to f_midi_alloc().

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 8653d71ce3763aedcf3d2331f59beda3fecd79e4, < 3d8b11255e632170f32f1925bfcaf96331f36317; >= 8653d71ce3763aedcf3d2331f59beda3fecd79e4, < 02ac76f27db23ef652358458c272d9d2d6f51167; >= 8653d71ce3763aedcf3d2331f59beda3fecd79e4, < 858576de6b2f5166b08dae803f0fd0766dcb3002; >= 8653d71ce3763aedcf3d2331f59beda3fecd79e4, < 7e07d3e4c389217d7d7171d80edf2e23ac70f1ea; 89019ab7a64fcdf98a2ba7799e5c6aff58d4a05d; 3635523e9b96213969693c320302d536774d8e9b; >= 5.4.291, < 5.5; >= 5.10.235, < 5.11
LinuxLinux5.12

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-90021?
In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_midi: initialize work in f_midi_alloc() f_midi_alloc initializes free_ref to 1 and it can only be incremented when a sound card is registered via f_midi_register_card(). f_midi_register_card() is only called in f_midi_bind() which actually performs INIT_WORK. If f_midi_bind() is never run, work is not initialized and the if condition in f_midi_free becomes true, this results in a warning later in __flush_work as work->func = 0. Fix this by moving INIT_WORK from f_midi_bind() to f_midi_alloc().
How severe is CVE-2026-90021?
Severity scoring for CVE-2026-90021 is pending analysis.
How do I fix CVE-2026-90021?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST