CVE-2026-89735 is a vulnerability in Linux Kernel
Published on September 11, 2026
usb: gadget: midi2: remove default configfs groups on teardown
In the Linux kernel, the following vulnerability has been resolved:
usb: gadget: midi2: remove default configfs groups on teardown
f_midi2_alloc_inst() creates default configfs child groups for the
default endpoint and default block using configfs_add_default_group(),
setting their internal refcount to 1.
However, during function teardown in f_midi2_free_inst() or EP cleanup
in f_midi2_ep_opts_release(), configfs_remove_default_groups() is
never called, therefore never dropping the refcount and leaking struct
f_midi2_ep_opts and f_midi2_block_opts.
Add the missing configfs_remove_default_groups() in the afformentioned
functions to free the structs properly.
Products Associated with CVE-2026-89735
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Affected Versions
Linux:- Version 8b645922b22303cec4628dbbbf6c8553d1cdec87 and below 4beda67ee72e0c8df5b49951dd8b96f6adb25e02 is affected.
- Version 8b645922b22303cec4628dbbbf6c8553d1cdec87 and below a15c2acd3083461f91725760e59dff88b33c28f6 is affected.
- Version 8b645922b22303cec4628dbbbf6c8553d1cdec87 and below 9ea5dfb2bfef4f8a7e704d1921d8a790cb7fb700 is affected.
- Version 8b645922b22303cec4628dbbbf6c8553d1cdec87 and below 0f6bffb5008f0cba9cad5ded2caccc64466a6e54 is affected.
- Version 6.6 is affected.
- Before 6.6 is unaffected.
- Version 6.12.109, <= 6.12.* is unaffected.
- Version 6.18.50, <= 6.18.* is unaffected.
- Version 7.2.4, <= 7.2.* is unaffected.
- Version 7.3-rc1, <= * is unaffected.