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CVE-2026-89735 (GCVE-0-2026-89735)

Vulnerability from cvelistv5 – Published: 2026-09-11 19:46 – Updated: 2026-09-14 12:02
VLAI
Title
usb: gadget: midi2: remove default configfs groups on teardown
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.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 8b645922b22303cec4628dbbbf6c8553d1cdec87 , < 79dbedf40ad930f83839e564394dc5d1a54938c6 (git)
Affected: 8b645922b22303cec4628dbbbf6c8553d1cdec87 , < 4beda67ee72e0c8df5b49951dd8b96f6adb25e02 (git)
Affected: 8b645922b22303cec4628dbbbf6c8553d1cdec87 , < a15c2acd3083461f91725760e59dff88b33c28f6 (git)
Affected: 8b645922b22303cec4628dbbbf6c8553d1cdec87 , < 9ea5dfb2bfef4f8a7e704d1921d8a790cb7fb700 (git)
Affected: 8b645922b22303cec4628dbbbf6c8553d1cdec87 , < 0f6bffb5008f0cba9cad5ded2caccc64466a6e54 (git)
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Linux Linux Affected: 6.6
Unaffected: 0 , < 6.6 (semver)
Unaffected: 6.6.157 , ≤ 6.6.* (semver)
Unaffected: 6.12.109 , ≤ 6.12.* (semver)
Unaffected: 6.18.50 , ≤ 6.18.* (semver)
Unaffected: 7.2.4 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/usb/gadget/function/f_midi2.c"
          ],
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          "vendor": "Linux",
          "versions": [
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              "versionType": "git"
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          "defaultStatus": "affected",
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          "vendor": "Linux",
          "versions": [
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              "version": "6.6"
            },
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              "version": "0",
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              "versionType": "semver"
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              "status": "unaffected",
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            {
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            }
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        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
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              "operator": "OR"
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      "descriptions": [
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          "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-14T12:02:22.452Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/79dbedf40ad930f83839e564394dc5d1a54938c6"
        },
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          "url": "https://git.kernel.org/stable/c/4beda67ee72e0c8df5b49951dd8b96f6adb25e02"
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        },
        {
          "url": "https://git.kernel.org/stable/c/0f6bffb5008f0cba9cad5ded2caccc64466a6e54"
        }
      ],
      "title": "usb: gadget: midi2: remove default configfs groups on teardown",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89735",
    "datePublished": "2026-09-11T19:46:43.899Z",
    "dateReserved": "2026-09-11T19:38:34.760Z",
    "dateUpdated": "2026-09-14T12:02:22.452Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
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      "date": "2026-09-16",
      "epss": "0.00168",
      "percentile": "0.06415"
    },
    "microsoft_vex": {
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      "product_status:known_not_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "usb: gadget: midi2: remove default configfs groups on teardown",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-89735.json",
      "version": "3"
    },
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    "suse_vex": {
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      "initial_release_date": "2026-09-12T16:22:37Z",
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      "status": "interim",
      "title": "SUSE CVE CVE-2026-89735",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-89735.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.