Vulnerability-Lookup

CVE-2026-64346 (GCVE-0-2026-64346)

Vulnerability from cvelistv5 – Published: 2026-07-25 08:50 – Updated: 2026-07-27 04:37

Title

usb: gadget: udc: Fix use-after-free in gadget_match_driver

Summary

In the Linux kernel, the following vulnerability has been resolved: usb: gadget: udc: Fix use-after-free in gadget_match_driver The udc structure acts as the management structure for the gadget, but their lifecycles are decoupled. A race condition exists where usb_del_gadget() frees the udc memory (e.g., via mode-switch work) while gadget_match_driver() concurrently accesses the freed udc memory (e.g., via configfs), causing a Use-After-Free (UAF) that triggers a NULL pointer dereference when the freed memory is zeroed: [39430.908615][ T1171] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000 [39430.911397][ T1171] pc : __pi_strcmp+0x20/0x140 [39430.911441][ T1171] lr : gadget_match_driver+0x34/0x60 ... [39430.911890][ T1171] usb_gadget_register_driver_owner+0x50/0xf8 [39430.911910][ T1171] gadget_dev_desc_UDC_store+0xf4/0x140 [39430.931308][ T1171] configfs_write_iter+0xec/0x134 [39430.957058][ T1171] Workqueue: events_freezable __dwc3_set_mode [39430.957287][ T1171] dwc3_gadget_exit+0x34/0x8c [39430.957304][ T1171] __dwc3_set_mode+0xc0/0x664 Fix this by ensuring the udc structure remains allocated until the gadget is released. To achieve this, introduce a new usb_gadget_release() routine to the core. When the gadget is added, usb_add_gadget() stores the gadget's release routine in the udc structure and takes a reference to the udc. When the gadget is released, usb_gadget_release() drops the reference to the udc and then calls the gadget's release routine.

Severity

No CVSS data available.

Assigner

Linux

References

6 references

URL	Tags
https://git.kernel.org/stable/c/50eeb8e8a4f389efc…
https://git.kernel.org/stable/c/7a5214dae906d9f58…
https://git.kernel.org/stable/c/d026f71df141c9b06…
https://git.kernel.org/stable/c/b52476a83d9e12df0…
https://git.kernel.org/stable/c/54fa390aae393eb13…
https://git.kernel.org/stable/c/67e511d2989eb1c8c…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: fc274c1e997314bf47f6a62c79b5d7e554ed59c4 , < 50eeb8e8a4f389efc91b93cff14a683e714ec194 (git) Affected: fc274c1e997314bf47f6a62c79b5d7e554ed59c4 , < 7a5214dae906d9f58e07bc4995e8181ee74439f4 (git) Affected: fc274c1e997314bf47f6a62c79b5d7e554ed59c4 , < d026f71df141c9b064ff32a78af5391a31ef75c2 (git) Affected: fc274c1e997314bf47f6a62c79b5d7e554ed59c4 , < b52476a83d9e12df00765359d728a875b128bef1 (git) Affected: fc274c1e997314bf47f6a62c79b5d7e554ed59c4 , < 54fa390aae393eb130f307a85562e3001cc39a52 (git) Affected: fc274c1e997314bf47f6a62c79b5d7e554ed59c4 , < 67e511d2989eb1c8c588b599ce2fcc6bb8e6f7ea (git)
Linux	Linux	Affected: 5.19 Unaffected: 0 , < 5.19 (semver) Unaffected: 6.1.178 , ≤ 6.1.* (semver) Unaffected: 6.6.145 , ≤ 6.6.* (semver) Unaffected: 6.12.96 , ≤ 6.12.* (semver) Unaffected: 6.18.39 , ≤ 6.18.* (semver) Unaffected: 7.1.4 , ≤ 7.1.* (semver) Unaffected: 7.2-rc3 , ≤ * (original_commit_for_fix)

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JSON

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{
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: udc: Fix use-after-free in gadget_match_driver\n\nThe udc structure acts as the management structure for the gadget,\nbut their lifecycles are decoupled. A race condition exists where\nusb_del_gadget() frees the udc memory (e.g., via mode-switch work)\nwhile gadget_match_driver() concurrently accesses the freed udc memory\n(e.g., via configfs), causing a Use-After-Free (UAF) that triggers a\nNULL pointer dereference when the freed memory is zeroed:\n\n[39430.908615][ T1171] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000\n[39430.911397][ T1171] pc : __pi_strcmp+0x20/0x140\n[39430.911441][ T1171] lr : gadget_match_driver+0x34/0x60\n...\n[39430.911890][ T1171]  usb_gadget_register_driver_owner+0x50/0xf8\n[39430.911910][ T1171]  gadget_dev_desc_UDC_store+0xf4/0x140\n[39430.931308][ T1171]  configfs_write_iter+0xec/0x134\n\n[39430.957058][ T1171] Workqueue: events_freezable __dwc3_set_mode\n[39430.957287][ T1171]  dwc3_gadget_exit+0x34/0x8c\n[39430.957304][ T1171]  __dwc3_set_mode+0xc0/0x664\n\nFix this by ensuring the udc structure remains allocated until the\ngadget is released. To achieve this, introduce a new\nusb_gadget_release() routine to the core. When the gadget is added,\nusb_add_gadget() stores the gadget\u0027s release routine in the udc\nstructure and takes a reference to the udc. When the gadget is\nreleased, usb_gadget_release() drops the reference to the udc and\nthen calls the gadget\u0027s release routine."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-27T04:37:30.473Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/50eeb8e8a4f389efc91b93cff14a683e714ec194"
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          "url": "https://git.kernel.org/stable/c/67e511d2989eb1c8c588b599ce2fcc6bb8e6f7ea"
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      ],
      "title": "usb: gadget: udc: Fix use-after-free in gadget_match_driver",
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      }
    }
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64346",
    "datePublished": "2026-07-25T08:50:07.680Z",
    "dateReserved": "2026-07-19T15:36:31.782Z",
    "dateUpdated": "2026-07-27T04:37:30.473Z",
    "state": "PUBLISHED"
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      "date": "2026-07-26",
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A race condition exists where\\nusb_del_gadget() frees the udc memory (e.g., via mode-switch work)\\nwhile gadget_match_driver() concurrently accesses the freed udc memory\\n(e.g., via configfs), causing a Use-After-Free (UAF) that triggers a\\nNULL pointer dereference when the freed memory is zeroed:\\n\\n[39430.908615][ T1171] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000\\n[39430.911397][ T1171] pc : __pi_strcmp+0x20/0x140\\n[39430.911441][ T1171] lr : gadget_match_driver+0x34/0x60\\n...\\n[39430.911890][ T1171]  usb_gadget_register_driver_owner+0x50/0xf8\\n[39430.911910][ T1171]  gadget_dev_desc_UDC_store+0xf4/0x140\\n[39430.931308][ T1171]  configfs_write_iter+0xec/0x134\\n\\n[39430.957058][ T1171] Workqueue: events_freezable __dwc3_set_mode\\n[39430.957287][ T1171]  dwc3_gadget_exit+0x34/0x8c\\n[39430.957304][ T1171]  __dwc3_set_mode+0xc0/0x664\\n\\nFix this by ensuring the udc structure remains allocated until the\\ngadget is released. To achieve this, introduce a new\\nusb_gadget_release() routine to the core. When the gadget is added,\\nusb_add_gadget() stores the gadget\u0027s release routine in the udc\\nstructure and takes a reference to the udc. When the gadget is\\nreleased, usb_gadget_release() drops the reference to the udc and\\nthen calls the gadget\u0027s release routine.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/usb/gadget/udc/core.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"fc274c1e997314bf47f6a62c79b5d7e554ed59c4\",\"lessThan\":\"50eeb8e8a4f389efc91b93cff14a683e714ec194\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"fc274c1e997314bf47f6a62c79b5d7e554ed59c4\",\"lessThan\":\"7a5214dae906d9f58e07bc4995e8181ee74439f4\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"fc274c1e997314bf47f6a62c79b5d7e554ed59c4\",\"lessThan\":\"d026f71df141c9b064ff32a78af5391a31ef75c2\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"fc274c1e997314bf47f6a62c79b5d7e554ed59c4\",\"lessThan\":\"b52476a83d9e12df00765359d728a875b128bef1\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"fc274c1e997314bf47f6a62c79b5d7e554ed59c4\",\"lessThan\":\"54fa390aae393eb130f307a85562e3001cc39a52\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"fc274c1e997314bf47f6a62c79b5d7e554ed59c4\",\"lessThan\":\"67e511d2989eb1c8c588b599ce2fcc6bb8e6f7ea\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/usb/gadget/udc/core.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.19\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.19\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.178\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.145\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.96\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.39\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.4\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2-rc3\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/50eeb8e8a4f389efc91b93cff14a683e714ec194\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/54fa390aae393eb130f307a85562e3001cc39a52\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/67e511d2989eb1c8c588b599ce2fcc6bb8e6f7ea\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7a5214dae906d9f58e07bc4995e8181ee74439f4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b52476a83d9e12df00765359d728a875b128bef1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d026f71df141c9b064ff32a78af5391a31ef75c2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "suse_vex": {
      "aggregate_severity": "not set",
      "current_release_date": "2026-07-25T16:01:19Z",
      "cve": "CVE-2026-64346",
      "id": "CVE-2026-64346",
      "initial_release_date": "2026-07-25T16:01:19Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-64346",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64346.json",
      "version": "2"
    }
  }
}

GHSA-8737-2W76-FPFM

Vulnerability from github – Published: 2026-07-25 12:31 – Updated: 2026-07-25 12:31

Details

In the Linux kernel, the following vulnerability has been resolved:

usb: gadget: udc: Fix use-after-free in gadget_match_driver

The udc structure acts as the management structure for the gadget, but their lifecycles are decoupled. A race condition exists where usb_del_gadget() frees the udc memory (e.g., via mode-switch work) while gadget_match_driver() concurrently accesses the freed udc memory (e.g., via configfs), causing a Use-After-Free (UAF) that triggers a NULL pointer dereference when the freed memory is zeroed:

[39430.908615][ T1171] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000 [39430.911397][ T1171] pc : __pi_strcmp+0x20/0x140 [39430.911441][ T1171] lr : gadget_match_driver+0x34/0x60 ... [39430.911890][ T1171] usb_gadget_register_driver_owner+0x50/0xf8 [39430.911910][ T1171] gadget_dev_desc_UDC_store+0xf4/0x140 [39430.931308][ T1171] configfs_write_iter+0xec/0x134

[39430.957058][ T1171] Workqueue: events_freezable __dwc3_set_mode [39430.957287][ T1171] dwc3_gadget_exit+0x34/0x8c [39430.957304][ T1171] __dwc3_set_mode+0xc0/0x664

Fix this by ensuring the udc structure remains allocated until the gadget is released. To achieve this, introduce a new usb_gadget_release() routine to the core. When the gadget is added, usb_add_gadget() stores the gadget's release routine in the udc structure and takes a reference to the udc. When the gadget is released, usb_gadget_release() drops the reference to the udc and then calls the gadget's release routine.

Show details on source website

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{
  "affected": [],
  "aliases": [
    "CVE-2026-64346"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-25T10:17:16Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: udc: Fix use-after-free in gadget_match_driver\n\nThe udc structure acts as the management structure for the gadget,\nbut their lifecycles are decoupled. A race condition exists where\nusb_del_gadget() frees the udc memory (e.g., via mode-switch work)\nwhile gadget_match_driver() concurrently accesses the freed udc memory\n(e.g., via configfs), causing a Use-After-Free (UAF) that triggers a\nNULL pointer dereference when the freed memory is zeroed:\n\n[39430.908615][ T1171] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000\n[39430.911397][ T1171] pc : __pi_strcmp+0x20/0x140\n[39430.911441][ T1171] lr : gadget_match_driver+0x34/0x60\n...\n[39430.911890][ T1171]  usb_gadget_register_driver_owner+0x50/0xf8\n[39430.911910][ T1171]  gadget_dev_desc_UDC_store+0xf4/0x140\n[39430.931308][ T1171]  configfs_write_iter+0xec/0x134\n\n[39430.957058][ T1171] Workqueue: events_freezable __dwc3_set_mode\n[39430.957287][ T1171]  dwc3_gadget_exit+0x34/0x8c\n[39430.957304][ T1171]  __dwc3_set_mode+0xc0/0x664\n\nFix this by ensuring the udc structure remains allocated until the\ngadget is released. To achieve this, introduce a new\nusb_gadget_release() routine to the core. When the gadget is added,\nusb_add_gadget() stores the gadget\u0027s release routine in the udc\nstructure and takes a reference to the udc. When the gadget is\nreleased, usb_gadget_release() drops the reference to the udc and\nthen calls the gadget\u0027s release routine.",
  "id": "GHSA-8737-2w76-fpfm",
  "modified": "2026-07-25T12:31:32Z",
  "published": "2026-07-25T12:31:32Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64346"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/50eeb8e8a4f389efc91b93cff14a683e714ec194"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/54fa390aae393eb130f307a85562e3001cc39a52"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/67e511d2989eb1c8c588b599ce2fcc6bb8e6f7ea"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7a5214dae906d9f58e07bc4995e8181ee74439f4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b52476a83d9e12df00765359d728a875b128bef1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d026f71df141c9b064ff32a78af5391a31ef75c2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f845852a5a8914277031f47d8de0f350fef52405"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

Sightings

Author	Source	Type	Date	Other

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.

Action not permitted

CVE-2026-64346 (GCVE-0-2026-64346)

GHSA-8737-2W76-FPFM

Tags

Sightings

Nomenclature