CVE-2022-50704 (GCVE-0-2022-50704)

Vulnerability from cvelistv5 – Published: 2025-12-24 10:55 – Updated: 2025-12-24 10:55
VLAI?
Title
USB: gadget: Fix use-after-free during usb config switch
Summary
In the Linux kernel, the following vulnerability has been resolved: USB: gadget: Fix use-after-free during usb config switch In the process of switching USB config from rndis to other config, if the hardware does not support the ->pullup callback, or the hardware encounters a low probability fault, both of them may cause the ->pullup callback to fail, which will then cause a system panic (use after free). The gadget drivers sometimes need to be unloaded regardless of the hardware's behavior. Analysis as follows: ======================================================================= (1) write /config/usb_gadget/g1/UDC "none" gether_disconnect+0x2c/0x1f8 rndis_disable+0x4c/0x74 composite_disconnect+0x74/0xb0 configfs_composite_disconnect+0x60/0x7c usb_gadget_disconnect+0x70/0x124 usb_gadget_unregister_driver+0xc8/0x1d8 gadget_dev_desc_UDC_store+0xec/0x1e4 (2) rm /config/usb_gadget/g1/configs/b.1/f1 rndis_deregister+0x28/0x54 rndis_free+0x44/0x7c usb_put_function+0x14/0x1c config_usb_cfg_unlink+0xc4/0xe0 configfs_unlink+0x124/0x1c8 vfs_unlink+0x114/0x1dc (3) rmdir /config/usb_gadget/g1/functions/rndis.gs4 panic+0x1fc/0x3d0 do_page_fault+0xa8/0x46c do_mem_abort+0x3c/0xac el1_sync_handler+0x40/0x78 0xffffff801138f880 rndis_close+0x28/0x34 eth_stop+0x74/0x110 dev_close_many+0x48/0x194 rollback_registered_many+0x118/0x814 unregister_netdev+0x20/0x30 gether_cleanup+0x1c/0x38 rndis_attr_release+0xc/0x14 kref_put+0x74/0xb8 configfs_rmdir+0x314/0x374 If gadget->ops->pullup() return an error, function rndis_close() will be called, then it will causes a use-after-free problem. =======================================================================
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 0a55187a1ec8c03d0619e7ce41d10fdc39cff036 , < 30e926aa835ac2e6ad05822e4cb75833feb0d99f (git)
Affected: 0a55187a1ec8c03d0619e7ce41d10fdc39cff036 , < 99a58ac42d9b6911834b0224b6782aea0c311346 (git)
Affected: 0a55187a1ec8c03d0619e7ce41d10fdc39cff036 , < afdc12887f2b2ecf20d065a7d81ad29824155083 (git)
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    Linux Linux Affected: 4.20
Unaffected: 0 , < 4.20 (semver)
Unaffected: 6.0.16 , ≤ 6.0.* (semver)
Unaffected: 6.1.2 , ≤ 6.1.* (semver)
Unaffected: 6.2 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/usb/gadget/udc/core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "30e926aa835ac2e6ad05822e4cb75833feb0d99f",
              "status": "affected",
              "version": "0a55187a1ec8c03d0619e7ce41d10fdc39cff036",
              "versionType": "git"
            },
            {
              "lessThan": "99a58ac42d9b6911834b0224b6782aea0c311346",
              "status": "affected",
              "version": "0a55187a1ec8c03d0619e7ce41d10fdc39cff036",
              "versionType": "git"
            },
            {
              "lessThan": "afdc12887f2b2ecf20d065a7d81ad29824155083",
              "status": "affected",
              "version": "0a55187a1ec8c03d0619e7ce41d10fdc39cff036",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/usb/gadget/udc/core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.20"
            },
            {
              "lessThan": "4.20",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.0.*",
              "status": "unaffected",
              "version": "6.0.16",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.2",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.0.16",
                  "versionStartIncluding": "4.20",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.2",
                  "versionStartIncluding": "4.20",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.2",
                  "versionStartIncluding": "4.20",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nUSB: gadget: Fix use-after-free during usb config switch\n\nIn the process of switching USB config from rndis to other config,\nif the hardware does not support the -\u003epullup callback, or the\nhardware encounters a low probability fault, both of them may cause\nthe -\u003epullup callback to fail, which will then cause a system panic\n(use after free).\n\nThe gadget drivers sometimes need to be unloaded regardless of the\nhardware\u0027s behavior.\n\nAnalysis as follows:\n=======================================================================\n(1) write /config/usb_gadget/g1/UDC \"none\"\n\ngether_disconnect+0x2c/0x1f8\nrndis_disable+0x4c/0x74\ncomposite_disconnect+0x74/0xb0\nconfigfs_composite_disconnect+0x60/0x7c\nusb_gadget_disconnect+0x70/0x124\nusb_gadget_unregister_driver+0xc8/0x1d8\ngadget_dev_desc_UDC_store+0xec/0x1e4\n\n(2) rm /config/usb_gadget/g1/configs/b.1/f1\n\nrndis_deregister+0x28/0x54\nrndis_free+0x44/0x7c\nusb_put_function+0x14/0x1c\nconfig_usb_cfg_unlink+0xc4/0xe0\nconfigfs_unlink+0x124/0x1c8\nvfs_unlink+0x114/0x1dc\n\n(3) rmdir /config/usb_gadget/g1/functions/rndis.gs4\n\npanic+0x1fc/0x3d0\ndo_page_fault+0xa8/0x46c\ndo_mem_abort+0x3c/0xac\nel1_sync_handler+0x40/0x78\n0xffffff801138f880\nrndis_close+0x28/0x34\neth_stop+0x74/0x110\ndev_close_many+0x48/0x194\nrollback_registered_many+0x118/0x814\nunregister_netdev+0x20/0x30\ngether_cleanup+0x1c/0x38\nrndis_attr_release+0xc/0x14\nkref_put+0x74/0xb8\nconfigfs_rmdir+0x314/0x374\n\nIf gadget-\u003eops-\u003epullup() return an error, function rndis_close() will be\ncalled, then it will causes a use-after-free problem.\n======================================================================="
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-12-24T10:55:19.295Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/30e926aa835ac2e6ad05822e4cb75833feb0d99f"
        },
        {
          "url": "https://git.kernel.org/stable/c/99a58ac42d9b6911834b0224b6782aea0c311346"
        },
        {
          "url": "https://git.kernel.org/stable/c/afdc12887f2b2ecf20d065a7d81ad29824155083"
        }
      ],
      "title": "USB: gadget: Fix use-after-free during usb config switch",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-50704",
    "datePublished": "2025-12-24T10:55:19.295Z",
    "dateReserved": "2025-12-24T10:53:15.518Z",
    "dateUpdated": "2025-12-24T10:55:19.295Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2022-50704\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-12-24T11:15:50.573\",\"lastModified\":\"2025-12-29T15:58:56.260\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nUSB: gadget: Fix use-after-free during usb config switch\\n\\nIn the process of switching USB config from rndis to other config,\\nif the hardware does not support the -\u003epullup callback, or the\\nhardware encounters a low probability fault, both of them may cause\\nthe -\u003epullup callback to fail, which will then cause a system panic\\n(use after free).\\n\\nThe gadget drivers sometimes need to be unloaded regardless of the\\nhardware\u0027s behavior.\\n\\nAnalysis as follows:\\n=======================================================================\\n(1) write /config/usb_gadget/g1/UDC \\\"none\\\"\\n\\ngether_disconnect+0x2c/0x1f8\\nrndis_disable+0x4c/0x74\\ncomposite_disconnect+0x74/0xb0\\nconfigfs_composite_disconnect+0x60/0x7c\\nusb_gadget_disconnect+0x70/0x124\\nusb_gadget_unregister_driver+0xc8/0x1d8\\ngadget_dev_desc_UDC_store+0xec/0x1e4\\n\\n(2) rm /config/usb_gadget/g1/configs/b.1/f1\\n\\nrndis_deregister+0x28/0x54\\nrndis_free+0x44/0x7c\\nusb_put_function+0x14/0x1c\\nconfig_usb_cfg_unlink+0xc4/0xe0\\nconfigfs_unlink+0x124/0x1c8\\nvfs_unlink+0x114/0x1dc\\n\\n(3) rmdir /config/usb_gadget/g1/functions/rndis.gs4\\n\\npanic+0x1fc/0x3d0\\ndo_page_fault+0xa8/0x46c\\ndo_mem_abort+0x3c/0xac\\nel1_sync_handler+0x40/0x78\\n0xffffff801138f880\\nrndis_close+0x28/0x34\\neth_stop+0x74/0x110\\ndev_close_many+0x48/0x194\\nrollback_registered_many+0x118/0x814\\nunregister_netdev+0x20/0x30\\ngether_cleanup+0x1c/0x38\\nrndis_attr_release+0xc/0x14\\nkref_put+0x74/0xb8\\nconfigfs_rmdir+0x314/0x374\\n\\nIf gadget-\u003eops-\u003epullup() return an error, function rndis_close() will be\\ncalled, then it will causes a use-after-free problem.\\n=======================================================================\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/30e926aa835ac2e6ad05822e4cb75833feb0d99f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/99a58ac42d9b6911834b0224b6782aea0c311346\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/afdc12887f2b2ecf20d065a7d81ad29824155083\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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