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

Vulnerability from cvelistv5 – Published: 2024-02-28 08:13 – Updated: 2026-05-11 13:45
VLAI
Title
usb: dwc3: gadget: Free gadget structure only after freeing endpoints
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.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
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.
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      "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"
    }
  }
}



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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

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.