CVE-2026-64346 (GCVE-0-2026-64346)
Vulnerability from cvelistv5
Published
2026-07-25 08:50
Modified
2026-08-17 04:53
Severity ?
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: fc274c1e997314bf47f6a62c79b5d7e554ed59c4
Version: fc274c1e997314bf47f6a62c79b5d7e554ed59c4
Version: fc274c1e997314bf47f6a62c79b5d7e554ed59c4
Version: fc274c1e997314bf47f6a62c79b5d7e554ed59c4
Version: fc274c1e997314bf47f6a62c79b5d7e554ed59c4
Version: fc274c1e997314bf47f6a62c79b5d7e554ed59c4
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/usb/gadget/udc/core.c"
          ],
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          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "version": "0",
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              "version": "6.6.145",
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              "status": "unaffected",
              "version": "6.12.96",
              "versionType": "semver"
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              "version": "7.1.4",
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      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "vulnerable": true
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              "negate": false,
              "operator": "OR"
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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": "2026-08-17T04:53:51.249Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/50eeb8e8a4f389efc91b93cff14a683e714ec194"
        },
        {
          "url": "https://git.kernel.org/stable/c/7a5214dae906d9f58e07bc4995e8181ee74439f4"
        },
        {
          "url": "https://git.kernel.org/stable/c/d026f71df141c9b064ff32a78af5391a31ef75c2"
        },
        {
          "url": "https://git.kernel.org/stable/c/b52476a83d9e12df00765359d728a875b128bef1"
        },
        {
          "url": "https://git.kernel.org/stable/c/54fa390aae393eb130f307a85562e3001cc39a52"
        },
        {
          "url": "https://git.kernel.org/stable/c/67e511d2989eb1c8c588b599ce2fcc6bb8e6f7ea"
        }
      ],
      "title": "usb: gadget: udc: Fix use-after-free in gadget_match_driver",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64346",
    "datePublished": "2026-07-25T08:50:07.680Z",
    "dateReserved": "2026-07-19T15:36:31.782Z",
    "dateUpdated": "2026-08-17T04:53:51.249Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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