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FKIE_CVE-2026-90021

Vulnerability from fkie_nvd - Published: 2026-09-16 11:17 - Updated: 2026-09-16 11:17
Severity
Summary
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().
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/02ac76f27db23ef652358458c272d9d2d6f51167
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3d8b11255e632170f32f1925bfcaf96331f36317
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7e07d3e4c389217d7d7171d80edf2e23ac70f1ea
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/858576de6b2f5166b08dae803f0fd0766dcb3002
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/usb/gadget/function/f_midi.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "3d8b11255e632170f32f1925bfcaf96331f36317",
              "status": "affected",
              "version": "8653d71ce3763aedcf3d2331f59beda3fecd79e4",
              "versionType": "git"
            },
            {
              "lessThan": "02ac76f27db23ef652358458c272d9d2d6f51167",
              "status": "affected",
              "version": "8653d71ce3763aedcf3d2331f59beda3fecd79e4",
              "versionType": "git"
            },
            {
              "lessThan": "858576de6b2f5166b08dae803f0fd0766dcb3002",
              "status": "affected",
              "version": "8653d71ce3763aedcf3d2331f59beda3fecd79e4",
              "versionType": "git"
            },
            {
              "lessThan": "7e07d3e4c389217d7d7171d80edf2e23ac70f1ea",
              "status": "affected",
              "version": "8653d71ce3763aedcf3d2331f59beda3fecd79e4",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "89019ab7a64fcdf98a2ba7799e5c6aff58d4a05d",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "3635523e9b96213969693c320302d536774d8e9b",
              "versionType": "git"
            },
            {
              "lessThan": "5.5",
              "status": "affected",
              "version": "5.4.291",
              "versionType": "semver"
            },
            {
              "lessThan": "5.11",
              "status": "affected",
              "version": "5.10.235",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/usb/gadget/function/f_midi.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.12"
            },
            {
              "lessThan": "5.12",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.110",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.51",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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": "CVE-2026-90021",
  "lastModified": "2026-09-16T11:17:15.030",
  "metrics": {},
  "published": "2026-09-16T11:17:15.030",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/02ac76f27db23ef652358458c272d9d2d6f51167"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/3d8b11255e632170f32f1925bfcaf96331f36317"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/7e07d3e4c389217d7d7171d80edf2e23ac70f1ea"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/858576de6b2f5166b08dae803f0fd0766dcb3002"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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