Vulnerability-Lookup

GHSA-5Q8G-48X9-PPW2

Vulnerability from github – Published: 2026-09-11 21:31 – Updated: 2026-09-11 21:31

Details

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

usb: dwc3: gadget: Fix use-after-free in dwc3_gadget_free_endpoints due to race condition

In dwc3_gadget_init_endpoint, &dep->nostream_work is bound with dwc3_nostream_work, and dwc3_gadget_endpoint_stream_event can queue this delayed work on system_percpu_wq when a DEPEVT_STREAM_NOSTREAM event is received.

If we remove the gadget, dwc3_gadget_free_endpoints makes cleanup and the memory allocated for dep with kzalloc() is released by kfree(dep), while the delayed work mentioned above may still be pending or running. The sequence of operations that may lead to a UAF bug is as follows:

CPU0 CPU1

                                      | dwc3_thread_interrupt
                                      | dwc3_endpoint_interrupt
                                      | dwc3_gadget_endpoint_stream_event
                                      | queue_delayed_work(system_percpu_wq,
                                      |                    &dep->nostream_work)

Fix it by canceling the delayed work before kfree(dep) in dwc3_gadget_free_endpoints.

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-89739"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-11T20:20:04Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: dwc3: gadget: Fix use-after-free in dwc3_gadget_free_endpoints due to race condition\n\nIn dwc3_gadget_init_endpoint, \u0026dep-\u003enostream_work is bound with\ndwc3_nostream_work, and dwc3_gadget_endpoint_stream_event can queue\nthis delayed work on system_percpu_wq when a DEPEVT_STREAM_NOSTREAM\nevent is received.\n\nIf we remove the gadget, dwc3_gadget_free_endpoints makes cleanup and\nthe memory allocated for dep with kzalloc() is released by kfree(dep),\nwhile the delayed work mentioned above may still be pending or\nrunning. The sequence of operations that may lead to a UAF bug is as\nfollows:\n\nCPU0                                      CPU1\n\n                                          | dwc3_thread_interrupt\n                                          | dwc3_endpoint_interrupt\n                                          | dwc3_gadget_endpoint_stream_event\n                                          | queue_delayed_work(system_percpu_wq,\n                                          |                    \u0026dep-\u003enostream_work)\ndwc3_gadget_free_endpoints                |\ndwc3_free_trb_pool(dep)                   |\nlist_del(\u0026dep-\u003eendpoint.ep_list)          |\ndwc3_debugfs_remove_endpoint_dir(dep)     |\nkfree(dep)                                |\n// dep is freed                           |\n                                          | dwc3_nostream_work\n                                          | // use dep (use-after-free)\n\nFix it by canceling the delayed work before kfree(dep) in\ndwc3_gadget_free_endpoints.",
  "id": "GHSA-5q8g-48x9-ppw2",
  "modified": "2026-09-11T21:31:38Z",
  "published": "2026-09-11T21:31:38Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89739"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/448e95c0f3eaa8d99f16ccae92ab94545f14413b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/93e08b13a7a30e4e78556d993720e0bc36231ec7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9c855832790cd488d87de1885974f4c37cfe7358"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-89739 (GCVE-0-2026-89739)

Vulnerability from cvelistv5 – Published: 2026-09-11 19:46 – Updated: 2026-09-11 19:46

Title

usb: dwc3: gadget: Fix use-after-free in dwc3_gadget_free_endpoints due to race condition

Summary

In the Linux kernel, the following vulnerability has been resolved: usb: dwc3: gadget: Fix use-after-free in dwc3_gadget_free_endpoints due to race condition In dwc3_gadget_init_endpoint, &dep->nostream_work is bound with dwc3_nostream_work, and dwc3_gadget_endpoint_stream_event can queue this delayed work on system_percpu_wq when a DEPEVT_STREAM_NOSTREAM event is received. If we remove the gadget, dwc3_gadget_free_endpoints makes cleanup and the memory allocated for dep with kzalloc() is released by kfree(dep), while the delayed work mentioned above may still be pending or running. The sequence of operations that may lead to a UAF bug is as follows: CPU0 CPU1 | dwc3_thread_interrupt | dwc3_endpoint_interrupt | dwc3_gadget_endpoint_stream_event | queue_delayed_work(system_percpu_wq, | &dep->nostream_work) dwc3_gadget_free_endpoints | dwc3_free_trb_pool(dep) | list_del(&dep->endpoint.ep_list) | dwc3_debugfs_remove_endpoint_dir(dep) | kfree(dep) | // dep is freed | | dwc3_nostream_work | // use dep (use-after-free) Fix it by canceling the delayed work before kfree(dep) in dwc3_gadget_free_endpoints.

Severity

No CVSS data available.

Assigner

Linux mitre root

References

3 references

URL	Tags
https://git.kernel.org/stable/c/448e95c0f3eaa8d99…
https://git.kernel.org/stable/c/93e08b13a7a30e4e7…
https://git.kernel.org/stable/c/9c855832790cd488d…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: dcfe437492e27d54f3ac491aed024da760f5c43c , < 448e95c0f3eaa8d99f16ccae92ab94545f14413b (git) Affected: dcfe437492e27d54f3ac491aed024da760f5c43c , < 93e08b13a7a30e4e78556d993720e0bc36231ec7 (git) Affected: dcfe437492e27d54f3ac491aed024da760f5c43c , < 9c855832790cd488d87de1885974f4c37cfe7358 (git)
Linux	Linux	Affected: 6.14 Unaffected: 0 , < 6.14 (semver) Unaffected: 6.18.50 , ≤ 6.18.* (semver) Unaffected: 7.2.4 , ≤ 7.2.* (semver) Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "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": "448e95c0f3eaa8d99f16ccae92ab94545f14413b",
              "status": "affected",
              "version": "dcfe437492e27d54f3ac491aed024da760f5c43c",
              "versionType": "git"
            },
            {
              "lessThan": "93e08b13a7a30e4e78556d993720e0bc36231ec7",
              "status": "affected",
              "version": "dcfe437492e27d54f3ac491aed024da760f5c43c",
              "versionType": "git"
            },
            {
              "lessThan": "9c855832790cd488d87de1885974f4c37cfe7358",
              "status": "affected",
              "version": "dcfe437492e27d54f3ac491aed024da760f5c43c",
              "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": "6.14"
            },
            {
              "lessThan": "6.14",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.50",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.50",
                  "versionStartIncluding": "6.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.4",
                  "versionStartIncluding": "6.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3-rc1",
                  "versionStartIncluding": "6.14",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: dwc3: gadget: Fix use-after-free in dwc3_gadget_free_endpoints due to race condition\n\nIn dwc3_gadget_init_endpoint, \u0026dep-\u003enostream_work is bound with\ndwc3_nostream_work, and dwc3_gadget_endpoint_stream_event can queue\nthis delayed work on system_percpu_wq when a DEPEVT_STREAM_NOSTREAM\nevent is received.\n\nIf we remove the gadget, dwc3_gadget_free_endpoints makes cleanup and\nthe memory allocated for dep with kzalloc() is released by kfree(dep),\nwhile the delayed work mentioned above may still be pending or\nrunning. The sequence of operations that may lead to a UAF bug is as\nfollows:\n\nCPU0                                      CPU1\n\n                                          | dwc3_thread_interrupt\n                                          | dwc3_endpoint_interrupt\n                                          | dwc3_gadget_endpoint_stream_event\n                                          | queue_delayed_work(system_percpu_wq,\n                                          |                    \u0026dep-\u003enostream_work)\ndwc3_gadget_free_endpoints                |\ndwc3_free_trb_pool(dep)                   |\nlist_del(\u0026dep-\u003eendpoint.ep_list)          |\ndwc3_debugfs_remove_endpoint_dir(dep)     |\nkfree(dep)                                |\n// dep is freed                           |\n                                          | dwc3_nostream_work\n                                          | // use dep (use-after-free)\n\nFix it by canceling the delayed work before kfree(dep) in\ndwc3_gadget_free_endpoints."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-11T19:46:46.545Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/448e95c0f3eaa8d99f16ccae92ab94545f14413b"
        },
        {
          "url": "https://git.kernel.org/stable/c/93e08b13a7a30e4e78556d993720e0bc36231ec7"
        },
        {
          "url": "https://git.kernel.org/stable/c/9c855832790cd488d87de1885974f4c37cfe7358"
        }
      ],
      "title": "usb: dwc3: gadget: Fix use-after-free in dwc3_gadget_free_endpoints due to race condition",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89739",
    "datePublished": "2026-09-11T19:46:46.545Z",
    "dateReserved": "2026-09-11T19:38:34.761Z",
    "dateUpdated": "2026-09-11T19:46:46.545Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.