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FKIE_CVE-2026-89735

Vulnerability from fkie_nvd - Published: 2026-09-11 20:20 - Updated: 2026-09-14 13:19
Severity
Summary
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0f6bffb5008f0cba9cad5ded2caccc64466a6e54
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4beda67ee72e0c8df5b49951dd8b96f6adb25e02
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/79dbedf40ad930f83839e564394dc5d1a54938c6
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9ea5dfb2bfef4f8a7e704d1921d8a790cb7fb700
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a15c2acd3083461f91725760e59dff88b33c28f6
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/usb/gadget/function/f_midi2.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "79dbedf40ad930f83839e564394dc5d1a54938c6",
              "status": "affected",
              "version": "8b645922b22303cec4628dbbbf6c8553d1cdec87",
              "versionType": "git"
            },
            {
              "lessThan": "4beda67ee72e0c8df5b49951dd8b96f6adb25e02",
              "status": "affected",
              "version": "8b645922b22303cec4628dbbbf6c8553d1cdec87",
              "versionType": "git"
            },
            {
              "lessThan": "a15c2acd3083461f91725760e59dff88b33c28f6",
              "status": "affected",
              "version": "8b645922b22303cec4628dbbbf6c8553d1cdec87",
              "versionType": "git"
            },
            {
              "lessThan": "9ea5dfb2bfef4f8a7e704d1921d8a790cb7fb700",
              "status": "affected",
              "version": "8b645922b22303cec4628dbbbf6c8553d1cdec87",
              "versionType": "git"
            },
            {
              "lessThan": "0f6bffb5008f0cba9cad5ded2caccc64466a6e54",
              "status": "affected",
              "version": "8b645922b22303cec4628dbbbf6c8553d1cdec87",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/usb/gadget/function/f_midi2.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.6"
            },
            {
              "lessThan": "6.6",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.157",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.109",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.50",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "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: midi2: remove default configfs groups on teardown\n\nf_midi2_alloc_inst() creates default configfs child groups for the\ndefault endpoint and default block using configfs_add_default_group(),\nsetting their internal refcount to 1.\n\nHowever, during function teardown in f_midi2_free_inst() or EP cleanup\nin f_midi2_ep_opts_release(), configfs_remove_default_groups() is\nnever called, therefore never dropping the refcount and leaking struct\nf_midi2_ep_opts and f_midi2_block_opts.\n\nAdd the missing configfs_remove_default_groups() in the afformentioned\nfunctions to free the structs properly."
    }
  ],
  "id": "CVE-2026-89735",
  "lastModified": "2026-09-14T13:19:22.590",
  "metrics": {},
  "published": "2026-09-11T20:20:03.967",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/0f6bffb5008f0cba9cad5ded2caccc64466a6e54"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/4beda67ee72e0c8df5b49951dd8b96f6adb25e02"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/79dbedf40ad930f83839e564394dc5d1a54938c6"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/9ea5dfb2bfef4f8a7e704d1921d8a790cb7fb700"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a15c2acd3083461f91725760e59dff88b33c28f6"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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