GHSA-9V89-J77V-QGFM
Vulnerability from github – Published: 2026-09-16 12:30 – Updated: 2026-09-16 12:30In 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": [],
"aliases": [
"CVE-2026-90021"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-09-16T11:17:15Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: f_midi: initialize work in f_midi_alloc()\n\nf_midi_alloc initializes free_ref to 1 and it can only be incremented\nwhen a sound card is registered via f_midi_register_card().\nf_midi_register_card() is only called in f_midi_bind() which actually\nperforms INIT_WORK. If f_midi_bind() is never run, work is not\ninitialized and the if condition in f_midi_free becomes true,\nthis results in a warning later in __flush_work as work-\u003efunc = 0.\nFix this by moving INIT_WORK from f_midi_bind() to f_midi_alloc().",
"id": "GHSA-9v89-j77v-qgfm",
"modified": "2026-09-16T12:30:45Z",
"published": "2026-09-16T12:30:45Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-90021"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/02ac76f27db23ef652358458c272d9d2d6f51167"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/3d8b11255e632170f32f1925bfcaf96331f36317"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/7e07d3e4c389217d7d7171d80edf2e23ac70f1ea"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/858576de6b2f5166b08dae803f0fd0766dcb3002"
}
],
"schema_version": "1.4.0",
"severity": []
}
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