CVE-2021-46986 (GCVE-0-2021-46986)

Vulnerability from cvelistv5 – Published: 2024-02-28 08:13 – Updated: 2025-05-04 07:01
VLAI?
Summary
In the Linux kernel, the following vulnerability has been resolved: usb: dwc3: gadget: Free gadget structure only after freeing endpoints As part of commit e81a7018d93a ("usb: dwc3: allocate gadget structure dynamically") the dwc3_gadget_release() was added which will free the dwc->gadget structure upon the device's removal when usb_del_gadget_udc() is called in dwc3_gadget_exit(). However, simply freeing the gadget results a dangling pointer situation: the endpoints created in dwc3_gadget_init_endpoints() have their dep->endpoint.ep_list members chained off the list_head anchored at dwc->gadget->ep_list. Thus when dwc->gadget is freed, the first dwc3_ep in the list now has a dangling prev pointer and likewise for the next pointer of the dwc3_ep at the tail of the list. The dwc3_gadget_free_endpoints() that follows will result in a use-after-free when it calls list_del(). This was caught by enabling KASAN and performing a driver unbind. The recent commit 568262bf5492 ("usb: dwc3: core: Add shutdown callback for dwc3") also exposes this as a panic during shutdown. There are a few possibilities to fix this. One could be to perform a list_del() of the gadget->ep_list itself which removes it from the rest of the dwc3_ep chain. Another approach is what this patch does, by splitting up the usb_del_gadget_udc() call into its separate "del" and "put" components. This allows dwc3_gadget_free_endpoints() to be called before the gadget is finally freed with usb_put_gadget().
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: e81a7018d93a7de31a3f121c9a7eecd0a5ec58b0 , < 1ea775021282d90e1d08d696b7ab54aa75d688e5 (git)
Affected: e81a7018d93a7de31a3f121c9a7eecd0a5ec58b0 , < bc0cdd72493236fb72b390ad38ce581e353c143c (git)
Affected: e81a7018d93a7de31a3f121c9a7eecd0a5ec58b0 , < b4b8e9601d7ee8806d2687f081a42485d27674a1 (git)
Affected: e81a7018d93a7de31a3f121c9a7eecd0a5ec58b0 , < bb9c74a5bd1462499fe5ccb1e3c5ac40dcfa9139 (git)
Create a notification for this product.
    Linux Linux Affected: 5.10
Unaffected: 0 , < 5.10 (semver)
Unaffected: 5.10.38 , ≤ 5.10.* (semver)
Unaffected: 5.11.22 , ≤ 5.11.* (semver)
Unaffected: 5.12.5 , ≤ 5.12.* (semver)
Unaffected: 5.13 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-04T05:24:37.910Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/1ea775021282d90e1d08d696b7ab54aa75d688e5"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/bc0cdd72493236fb72b390ad38ce581e353c143c"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/b4b8e9601d7ee8806d2687f081a42485d27674a1"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/bb9c74a5bd1462499fe5ccb1e3c5ac40dcfa9139"
          }
        ],
        "title": "CVE Program Container"
      },
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2021-46986",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-09-10T16:01:05.321895Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2024-09-11T17:33:39.499Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/usb/dwc3/gadget.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "1ea775021282d90e1d08d696b7ab54aa75d688e5",
              "status": "affected",
              "version": "e81a7018d93a7de31a3f121c9a7eecd0a5ec58b0",
              "versionType": "git"
            },
            {
              "lessThan": "bc0cdd72493236fb72b390ad38ce581e353c143c",
              "status": "affected",
              "version": "e81a7018d93a7de31a3f121c9a7eecd0a5ec58b0",
              "versionType": "git"
            },
            {
              "lessThan": "b4b8e9601d7ee8806d2687f081a42485d27674a1",
              "status": "affected",
              "version": "e81a7018d93a7de31a3f121c9a7eecd0a5ec58b0",
              "versionType": "git"
            },
            {
              "lessThan": "bb9c74a5bd1462499fe5ccb1e3c5ac40dcfa9139",
              "status": "affected",
              "version": "e81a7018d93a7de31a3f121c9a7eecd0a5ec58b0",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/usb/dwc3/gadget.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.10"
            },
            {
              "lessThan": "5.10",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.38",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.11.*",
              "status": "unaffected",
              "version": "5.11.22",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.12.*",
              "status": "unaffected",
              "version": "5.12.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "5.13",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.38",
                  "versionStartIncluding": "5.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.11.22",
                  "versionStartIncluding": "5.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.12.5",
                  "versionStartIncluding": "5.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.13",
                  "versionStartIncluding": "5.10",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: dwc3: gadget: Free gadget structure only after freeing endpoints\n\nAs part of commit e81a7018d93a (\"usb: dwc3: allocate gadget structure\ndynamically\") the dwc3_gadget_release() was added which will free\nthe dwc-\u003egadget structure upon the device\u0027s removal when\nusb_del_gadget_udc() is called in dwc3_gadget_exit().\n\nHowever, simply freeing the gadget results a dangling pointer\nsituation: the endpoints created in dwc3_gadget_init_endpoints()\nhave their dep-\u003eendpoint.ep_list members chained off the list_head\nanchored at dwc-\u003egadget-\u003eep_list.  Thus when dwc-\u003egadget is freed,\nthe first dwc3_ep in the list now has a dangling prev pointer and\nlikewise for the next pointer of the dwc3_ep at the tail of the list.\nThe dwc3_gadget_free_endpoints() that follows will result in a\nuse-after-free when it calls list_del().\n\nThis was caught by enabling KASAN and performing a driver unbind.\nThe recent commit 568262bf5492 (\"usb: dwc3: core: Add shutdown\ncallback for dwc3\") also exposes this as a panic during shutdown.\n\nThere are a few possibilities to fix this.  One could be to perform\na list_del() of the gadget-\u003eep_list itself which removes it from\nthe rest of the dwc3_ep chain.\n\nAnother approach is what this patch does, by splitting up the\nusb_del_gadget_udc() call into its separate \"del\" and \"put\"\ncomponents.  This allows dwc3_gadget_free_endpoints() to be\ncalled before the gadget is finally freed with usb_put_gadget()."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-05-04T07:01:46.315Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/1ea775021282d90e1d08d696b7ab54aa75d688e5"
        },
        {
          "url": "https://git.kernel.org/stable/c/bc0cdd72493236fb72b390ad38ce581e353c143c"
        },
        {
          "url": "https://git.kernel.org/stable/c/b4b8e9601d7ee8806d2687f081a42485d27674a1"
        },
        {
          "url": "https://git.kernel.org/stable/c/bb9c74a5bd1462499fe5ccb1e3c5ac40dcfa9139"
        }
      ],
      "title": "usb: dwc3: gadget: Free gadget structure only after freeing endpoints",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2021-46986",
    "datePublished": "2024-02-28T08:13:14.082Z",
    "dateReserved": "2024-02-27T18:42:55.946Z",
    "dateUpdated": "2025-05-04T07:01:46.315Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "fkie_nvd": {
      "configurations": "[{\"nodes\": [{\"operator\": \"OR\", \"negate\": false, \"cpeMatch\": [{\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"versionStartIncluding\": \"5.10\", \"versionEndExcluding\": \"5.10.38\", \"matchCriteriaId\": \"8051E54C-C4D7-4B79-90C8-3C0B5A772262\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"versionStartIncluding\": \"5.11\", \"versionEndExcluding\": \"5.11.22\", \"matchCriteriaId\": \"83B53E9A-F426-4C03-9A5F-A931FF79827E\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"versionStartIncluding\": \"5.12\", \"versionEndExcluding\": \"5.12.5\", \"matchCriteriaId\": \"0274929A-B36C-4F4C-AB22-30A0DD6B995B\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:o:linux:linux_kernel:5.13:rc1:*:*:*:*:*:*\", \"matchCriteriaId\": \"0CBAD0FC-C281-4666-AB2F-F8E6E1165DF7\"}]}]}]",
      "descriptions": "[{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nusb: dwc3: gadget: Free gadget structure only after freeing endpoints\\n\\nAs part of commit e81a7018d93a (\\\"usb: dwc3: allocate gadget structure\\ndynamically\\\") the dwc3_gadget_release() was added which will free\\nthe dwc-\u003egadget structure upon the device\u0027s removal when\\nusb_del_gadget_udc() is called in dwc3_gadget_exit().\\n\\nHowever, simply freeing the gadget results a dangling pointer\\nsituation: the endpoints created in dwc3_gadget_init_endpoints()\\nhave their dep-\u003eendpoint.ep_list members chained off the list_head\\nanchored at dwc-\u003egadget-\u003eep_list.  Thus when dwc-\u003egadget is freed,\\nthe first dwc3_ep in the list now has a dangling prev pointer and\\nlikewise for the next pointer of the dwc3_ep at the tail of the list.\\nThe dwc3_gadget_free_endpoints() that follows will result in a\\nuse-after-free when it calls list_del().\\n\\nThis was caught by enabling KASAN and performing a driver unbind.\\nThe recent commit 568262bf5492 (\\\"usb: dwc3: core: Add shutdown\\ncallback for dwc3\\\") also exposes this as a panic during shutdown.\\n\\nThere are a few possibilities to fix this.  One could be to perform\\na list_del() of the gadget-\u003eep_list itself which removes it from\\nthe rest of the dwc3_ep chain.\\n\\nAnother approach is what this patch does, by splitting up the\\nusb_del_gadget_udc() call into its separate \\\"del\\\" and \\\"put\\\"\\ncomponents.  This allows dwc3_gadget_free_endpoints() to be\\ncalled before the gadget is finally freed with usb_put_gadget().\"}, {\"lang\": \"es\", \"value\": \"En el kernel de Linux, se resolvi\\u00f3 la siguiente vulnerabilidad: usb: dwc3: gadget: estructura de gadget libre solo despu\\u00e9s de liberar los puntos finales. Como parte de el commit e81a7018d93a (\\\"usb: dwc3: asignar estructura de gadget din\\u00e1micamente\\\"), se agreg\\u00f3 dwc3_gadget_release() que libere la estructura dwc-\u0026gt;gadget al retirar el dispositivo cuando se llama a usb_del_gadget_udc() en dwc3_gadget_exit(). Sin embargo, simplemente liberar el gadget da como resultado una situaci\\u00f3n de puntero colgante: los puntos finales creados en dwc3_gadget_init_endpoints() tienen sus miembros dep-\u0026gt;endpoint.ep_list encadenados fuera del list_head anclado en dwc-\u0026gt;gadget-\u0026gt;ep_list. Por lo tanto, cuando se libera dwc-\u0026gt;gadget, el primer dwc3_ep de la lista ahora tiene un puntero anterior colgante y lo mismo ocurre con el siguiente puntero de dwc3_ep al final de la lista. El dwc3_gadget_free_endpoints() que sigue dar\\u00e1 como resultado un use-after-free cuando llame a list_del(). Esto se detect\\u00f3 habilitando KASAN y realizando una desvinculaci\\u00f3n del controlador. La reciente confirmaci\\u00f3n 568262bf5492 (\\\"usb: dwc3: core: Add Shutdown Callback for dwc3\\\") tambi\\u00e9n expone esto como un p\\u00e1nico durante el apagado. Hay algunas posibilidades para solucionar este problema. Una podr\\u00eda ser realizar un list_del() del propio gadget-\u0026gt;ep_list que lo elimine del resto de la cadena dwc3_ep. Otro enfoque es lo que hace este parche, al dividir la llamada usb_del_gadget_udc() en sus componentes separados \\\"del\\\" y \\\"put\\\". Esto permite llamar a dwc3_gadget_free_endpoints() antes de que el gadget se libere finalmente con usb_put_gadget().\"}]",
      "id": "CVE-2021-46986",
      "lastModified": "2024-12-31T16:14:55.390",
      "metrics": "{\"cvssMetricV31\": [{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"cvssData\": {\"version\": \"3.1\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\", \"baseScore\": 5.5, \"baseSeverity\": \"MEDIUM\", \"attackVector\": \"LOCAL\", \"attackComplexity\": \"LOW\", \"privilegesRequired\": \"LOW\", \"userInteraction\": \"NONE\", \"scope\": \"UNCHANGED\", \"confidentialityImpact\": \"NONE\", \"integrityImpact\": \"NONE\", \"availabilityImpact\": \"HIGH\"}, \"exploitabilityScore\": 1.8, \"impactScore\": 3.6}]}",
      "published": "2024-02-28T09:15:37.540",
      "references": "[{\"url\": \"https://git.kernel.org/stable/c/1ea775021282d90e1d08d696b7ab54aa75d688e5\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/b4b8e9601d7ee8806d2687f081a42485d27674a1\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/bb9c74a5bd1462499fe5ccb1e3c5ac40dcfa9139\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/bc0cdd72493236fb72b390ad38ce581e353c143c\", \"source\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/1ea775021282d90e1d08d696b7ab54aa75d688e5\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/b4b8e9601d7ee8806d2687f081a42485d27674a1\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/bb9c74a5bd1462499fe5ccb1e3c5ac40dcfa9139\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Patch\"]}, {\"url\": \"https://git.kernel.org/stable/c/bc0cdd72493236fb72b390ad38ce581e353c143c\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Patch\"]}]",
      "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "vulnStatus": "Analyzed",
      "weaknesses": "[{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"description\": [{\"lang\": \"en\", \"value\": \"CWE-416\"}]}]"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2021-46986\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-02-28T09:15:37.540\",\"lastModified\":\"2024-12-31T16:14:55.390\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nusb: dwc3: gadget: Free gadget structure only after freeing endpoints\\n\\nAs part of commit e81a7018d93a (\\\"usb: dwc3: allocate gadget structure\\ndynamically\\\") the dwc3_gadget_release() was added which will free\\nthe dwc-\u003egadget structure upon the device\u0027s removal when\\nusb_del_gadget_udc() is called in dwc3_gadget_exit().\\n\\nHowever, simply freeing the gadget results a dangling pointer\\nsituation: the endpoints created in dwc3_gadget_init_endpoints()\\nhave their dep-\u003eendpoint.ep_list members chained off the list_head\\nanchored at dwc-\u003egadget-\u003eep_list.  Thus when dwc-\u003egadget is freed,\\nthe first dwc3_ep in the list now has a dangling prev pointer and\\nlikewise for the next pointer of the dwc3_ep at the tail of the list.\\nThe dwc3_gadget_free_endpoints() that follows will result in a\\nuse-after-free when it calls list_del().\\n\\nThis was caught by enabling KASAN and performing a driver unbind.\\nThe recent commit 568262bf5492 (\\\"usb: dwc3: core: Add shutdown\\ncallback for dwc3\\\") also exposes this as a panic during shutdown.\\n\\nThere are a few possibilities to fix this.  One could be to perform\\na list_del() of the gadget-\u003eep_list itself which removes it from\\nthe rest of the dwc3_ep chain.\\n\\nAnother approach is what this patch does, by splitting up the\\nusb_del_gadget_udc() call into its separate \\\"del\\\" and \\\"put\\\"\\ncomponents.  This allows dwc3_gadget_free_endpoints() to be\\ncalled before the gadget is finally freed with usb_put_gadget().\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: usb: dwc3: gadget: estructura de gadget libre solo despu\u00e9s de liberar los puntos finales. Como parte de el commit e81a7018d93a (\\\"usb: dwc3: asignar estructura de gadget din\u00e1micamente\\\"), se agreg\u00f3 dwc3_gadget_release() que libere la estructura dwc-\u0026gt;gadget al retirar el dispositivo cuando se llama a usb_del_gadget_udc() en dwc3_gadget_exit(). Sin embargo, simplemente liberar el gadget da como resultado una situaci\u00f3n de puntero colgante: los puntos finales creados en dwc3_gadget_init_endpoints() tienen sus miembros dep-\u0026gt;endpoint.ep_list encadenados fuera del list_head anclado en dwc-\u0026gt;gadget-\u0026gt;ep_list. Por lo tanto, cuando se libera dwc-\u0026gt;gadget, el primer dwc3_ep de la lista ahora tiene un puntero anterior colgante y lo mismo ocurre con el siguiente puntero de dwc3_ep al final de la lista. El dwc3_gadget_free_endpoints() que sigue dar\u00e1 como resultado un use-after-free cuando llame a list_del(). Esto se detect\u00f3 habilitando KASAN y realizando una desvinculaci\u00f3n del controlador. La reciente confirmaci\u00f3n 568262bf5492 (\\\"usb: dwc3: core: Add Shutdown Callback for dwc3\\\") tambi\u00e9n expone esto como un p\u00e1nico durante el apagado. Hay algunas posibilidades para solucionar este problema. Una podr\u00eda ser realizar un list_del() del propio gadget-\u0026gt;ep_list que lo elimine del resto de la cadena dwc3_ep. Otro enfoque es lo que hace este parche, al dividir la llamada usb_del_gadget_udc() en sus componentes separados \\\"del\\\" y \\\"put\\\". Esto permite llamar a dwc3_gadget_free_endpoints() antes de que el gadget se libere finalmente con usb_put_gadget().\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-416\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.10\",\"versionEndExcluding\":\"5.10.38\",\"matchCriteriaId\":\"8051E54C-C4D7-4B79-90C8-3C0B5A772262\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.11.22\",\"matchCriteriaId\":\"83B53E9A-F426-4C03-9A5F-A931FF79827E\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.12\",\"versionEndExcluding\":\"5.12.5\",\"matchCriteriaId\":\"0274929A-B36C-4F4C-AB22-30A0DD6B995B\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.13:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"0CBAD0FC-C281-4666-AB2F-F8E6E1165DF7\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1ea775021282d90e1d08d696b7ab54aa75d688e5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/b4b8e9601d7ee8806d2687f081a42485d27674a1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/bb9c74a5bd1462499fe5ccb1e3c5ac40dcfa9139\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/bc0cdd72493236fb72b390ad38ce581e353c143c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/1ea775021282d90e1d08d696b7ab54aa75d688e5\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/b4b8e9601d7ee8806d2687f081a42485d27674a1\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/bb9c74a5bd1462499fe5ccb1e3c5ac40dcfa9139\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/bc0cdd72493236fb72b390ad38ce581e353c143c\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]}]}}",
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://git.kernel.org/stable/c/1ea775021282d90e1d08d696b7ab54aa75d688e5\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/bc0cdd72493236fb72b390ad38ce581e353c143c\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/b4b8e9601d7ee8806d2687f081a42485d27674a1\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/bb9c74a5bd1462499fe5ccb1e3c5ac40dcfa9139\", \"tags\": [\"x_transferred\"]}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-04T05:24:37.910Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2021-46986\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-09-10T16:01:05.321895Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-09-11T12:42:17.915Z\"}}], \"cna\": {\"title\": \"usb: dwc3: gadget: Free gadget structure only after freeing endpoints\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"e81a7018d93a7de31a3f121c9a7eecd0a5ec58b0\", \"lessThan\": \"1ea775021282d90e1d08d696b7ab54aa75d688e5\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"e81a7018d93a7de31a3f121c9a7eecd0a5ec58b0\", \"lessThan\": \"bc0cdd72493236fb72b390ad38ce581e353c143c\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"e81a7018d93a7de31a3f121c9a7eecd0a5ec58b0\", \"lessThan\": \"b4b8e9601d7ee8806d2687f081a42485d27674a1\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"e81a7018d93a7de31a3f121c9a7eecd0a5ec58b0\", \"lessThan\": \"bb9c74a5bd1462499fe5ccb1e3c5ac40dcfa9139\", \"versionType\": \"git\"}], \"programFiles\": [\"drivers/usb/dwc3/gadget.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.10\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.10\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.38\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.11.22\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.11.*\"}, {\"status\": \"unaffected\", \"version\": \"5.12.5\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.12.*\"}, {\"status\": \"unaffected\", \"version\": \"5.13\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/usb/dwc3/gadget.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/1ea775021282d90e1d08d696b7ab54aa75d688e5\"}, {\"url\": \"https://git.kernel.org/stable/c/bc0cdd72493236fb72b390ad38ce581e353c143c\"}, {\"url\": \"https://git.kernel.org/stable/c/b4b8e9601d7ee8806d2687f081a42485d27674a1\"}, {\"url\": \"https://git.kernel.org/stable/c/bb9c74a5bd1462499fe5ccb1e3c5ac40dcfa9139\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nusb: dwc3: gadget: Free gadget structure only after freeing endpoints\\n\\nAs part of commit e81a7018d93a (\\\"usb: dwc3: allocate gadget structure\\ndynamically\\\") the dwc3_gadget_release() was added which will free\\nthe dwc-\u003egadget structure upon the device\u0027s removal when\\nusb_del_gadget_udc() is called in dwc3_gadget_exit().\\n\\nHowever, simply freeing the gadget results a dangling pointer\\nsituation: the endpoints created in dwc3_gadget_init_endpoints()\\nhave their dep-\u003eendpoint.ep_list members chained off the list_head\\nanchored at dwc-\u003egadget-\u003eep_list.  Thus when dwc-\u003egadget is freed,\\nthe first dwc3_ep in the list now has a dangling prev pointer and\\nlikewise for the next pointer of the dwc3_ep at the tail of the list.\\nThe dwc3_gadget_free_endpoints() that follows will result in a\\nuse-after-free when it calls list_del().\\n\\nThis was caught by enabling KASAN and performing a driver unbind.\\nThe recent commit 568262bf5492 (\\\"usb: dwc3: core: Add shutdown\\ncallback for dwc3\\\") also exposes this as a panic during shutdown.\\n\\nThere are a few possibilities to fix this.  One could be to perform\\na list_del() of the gadget-\u003eep_list itself which removes it from\\nthe rest of the dwc3_ep chain.\\n\\nAnother approach is what this patch does, by splitting up the\\nusb_del_gadget_udc() call into its separate \\\"del\\\" and \\\"put\\\"\\ncomponents.  This allows dwc3_gadget_free_endpoints() to be\\ncalled before the gadget is finally freed with usb_put_gadget().\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.38\", \"versionStartIncluding\": \"5.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.11.22\", \"versionStartIncluding\": \"5.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.12.5\", \"versionStartIncluding\": \"5.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.13\", \"versionStartIncluding\": \"5.10\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T07:01:46.315Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-46986\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-04T07:01:46.315Z\", \"dateReserved\": \"2024-02-27T18:42:55.946Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-02-28T08:13:14.082Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

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.