Vulnerability-Lookup

GHSA-P2G2-5XG5-FJ3W

Vulnerability from github – Published: 2026-09-11 21:31 – Updated: 2026-09-14 15:32

Details

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

usb: gadget: uvc: fix dangling pointers in uvc_function_bind() and uvc_function_unbind()

In uvc_function_bind() error path, we use usb_ep_free_request which uses uvc->control_req but does not set it to NULL afterwards. Thus, uvc->control_req is a dangling pointer causing a UAF. Also we do not set the uvc->control_buf pointer to NULL after freeing it, which is another dangling pointer. Fix it by setting uvc->control_req to NULL after we run usb_ep_free_request() and uvc->control_buf to NULL after kfree. Do the same for uvc_function_unbind().

Severity

7.8 (High)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2026-89733"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-11T20:20:03Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: uvc: fix dangling pointers in uvc_function_bind() and uvc_function_unbind()\n\nIn uvc_function_bind() error path, we use usb_ep_free_request which\nuses uvc-\u003econtrol_req but does not set it to NULL afterwards. Thus,\nuvc-\u003econtrol_req is a dangling pointer causing a UAF. Also we do not set\nthe uvc-\u003econtrol_buf pointer to NULL after freeing it, which is another\ndangling pointer. Fix it by setting uvc-\u003econtrol_req to NULL after we run\nusb_ep_free_request() and uvc-\u003econtrol_buf to NULL after kfree. Do the\nsame for uvc_function_unbind().",
  "id": "GHSA-p2g2-5xg5-fj3w",
  "modified": "2026-09-14T15:32:35Z",
  "published": "2026-09-11T21:31:38Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89733"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/38f822ddce9355893d734279a26ddec45182197e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/502a7f5b79b7ba751988789e982924f8f496129f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/85dd5e8bd6776d02854f2847d83429f1f712e99c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8e88ed8a374de67270d38689f2a81018909cafbb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9897b7da8c0ad8356c1b8649379fcb5a689462cb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bdab5605259ba5d6ff927c1a85cc83eb3ecfdacc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bec7708eb3b5295d12e931db24381b7c94c72953"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ddb1b0d5d858584ed0d3a5aaa042ee693998c7e2"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-89733 (GCVE-0-2026-89733)

Vulnerability from cvelistv5 – Published: 2026-09-11 19:46 – Updated: 2026-09-14 12:02

Title

usb: gadget: uvc: fix dangling pointers in uvc_function_bind() and uvc_function_unbind()

Summary

In the Linux kernel, the following vulnerability has been resolved: usb: gadget: uvc: fix dangling pointers in uvc_function_bind() and uvc_function_unbind() In uvc_function_bind() error path, we use usb_ep_free_request which uses uvc->control_req but does not set it to NULL afterwards. Thus, uvc->control_req is a dangling pointer causing a UAF. Also we do not set the uvc->control_buf pointer to NULL after freeing it, which is another dangling pointer. Fix it by setting uvc->control_req to NULL after we run usb_ep_free_request() and uvc->control_buf to NULL after kfree. Do the same for uvc_function_unbind().

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux mitre root

References

8 references

URL	Tags
https://git.kernel.org/stable/c/ddb1b0d5d858584ed…
https://git.kernel.org/stable/c/85dd5e8bd6776d028…
https://git.kernel.org/stable/c/502a7f5b79b7ba751…
https://git.kernel.org/stable/c/bec7708eb3b5295d1…
https://git.kernel.org/stable/c/8e88ed8a374de6727…
https://git.kernel.org/stable/c/9897b7da8c0ad8356…
https://git.kernel.org/stable/c/38f822ddce9355893…
https://git.kernel.org/stable/c/bdab5605259ba5d6f…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 0f9df939385527049c8062a099fbfa1479fe7ce0 , < ddb1b0d5d858584ed0d3a5aaa042ee693998c7e2 (git) Affected: 0f9df939385527049c8062a099fbfa1479fe7ce0 , < 85dd5e8bd6776d02854f2847d83429f1f712e99c (git) Affected: 0f9df939385527049c8062a099fbfa1479fe7ce0 , < 502a7f5b79b7ba751988789e982924f8f496129f (git) Affected: 0f9df939385527049c8062a099fbfa1479fe7ce0 , < bec7708eb3b5295d12e931db24381b7c94c72953 (git) Affected: 0f9df939385527049c8062a099fbfa1479fe7ce0 , < 8e88ed8a374de67270d38689f2a81018909cafbb (git) Affected: 0f9df939385527049c8062a099fbfa1479fe7ce0 , < 9897b7da8c0ad8356c1b8649379fcb5a689462cb (git) Affected: 0f9df939385527049c8062a099fbfa1479fe7ce0 , < 38f822ddce9355893d734279a26ddec45182197e (git) Affected: 0f9df939385527049c8062a099fbfa1479fe7ce0 , < bdab5605259ba5d6ff927c1a85cc83eb3ecfdacc (git) Affected: 1efa8a5aac93d9e67075995d7d4902b57ce184f7 (git) Affected: e7a4b0efe62e56a0acc81d16091c6efc2a282be8 (git) Affected: 065f5561a20659cf17aae5f72b32b5c2695c8e00 (git) Affected: 3.2.36 , < 3.3 (semver) Affected: 3.4.25 , < 3.5 (semver) Affected: 3.7.2 , < 3.8 (semver)
Linux	Linux	Affected: 3.8 Unaffected: 0 , < 3.8 (semver) Unaffected: 5.10.270 , ≤ 5.10.* (semver) Unaffected: 5.15.221 , ≤ 5.15.* (semver) Unaffected: 6.1.188 , ≤ 6.1.* (semver) Unaffected: 6.6.157 , ≤ 6.6.* (semver) Unaffected: 6.12.109 , ≤ 6.12.* (semver) Unaffected: 6.18.50 , ≤ 6.18.* (semver) Unaffected: 7.2.4 , ≤ 7.2.* (semver) Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)

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JSON

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{
  "containers": {
    "cna": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/usb/gadget/function/f_uvc.c"
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          "versions": [
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              "versionType": "git"
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            {
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              "status": "affected",
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            {
              "status": "affected",
              "version": "e7a4b0efe62e56a0acc81d16091c6efc2a282be8",
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            {
              "status": "affected",
              "version": "065f5561a20659cf17aae5f72b32b5c2695c8e00",
              "versionType": "git"
            },
            {
              "lessThan": "3.3",
              "status": "affected",
              "version": "3.2.36",
              "versionType": "semver"
            },
            {
              "lessThan": "3.5",
              "status": "affected",
              "version": "3.4.25",
              "versionType": "semver"
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          "versions": [
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              "status": "unaffected",
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              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.221",
              "versionType": "semver"
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              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.188",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.6.157",
              "versionType": "semver"
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              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.109",
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              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.50",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "7.2.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
            }
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        }
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      "cpeApplicability": [
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          "nodes": [
            {
              "cpeMatch": [
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                  "vulnerable": true
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                  "versionEndExcluding": "5.15.221",
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                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                {
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                  "versionEndExcluding": "6.6.157",
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                  "versionStartIncluding": "3.2.36",
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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: uvc: fix dangling pointers in uvc_function_bind() and uvc_function_unbind()\n\nIn uvc_function_bind() error path, we use usb_ep_free_request which\nuses uvc-\u003econtrol_req but does not set it to NULL afterwards. Thus,\nuvc-\u003econtrol_req is a dangling pointer causing a UAF. Also we do not set\nthe uvc-\u003econtrol_buf pointer to NULL after freeing it, which is another\ndangling pointer. Fix it by setting uvc-\u003econtrol_req to NULL after we run\nusb_ep_free_request() and uvc-\u003econtrol_buf to NULL after kfree. Do the\nsame for uvc_function_unbind()."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The UAF is reached by local writes to /sys/kernel/config/usb_gadget/\u003cg\u003e/UDC that drive uvc_function_bind()/uvc_function_unbind(); no USB host traffic or physical attachment is required, matching prior gadget bind dangling-pointer scores and being higher severity than Physical.\nAC:L - The attacker controls the successful bind, the unbind that leaves uvc-\u003econtrol_req dangling, and a later bind that fails before reallocating (e.g. exhausting usb_ep_autoconfig(), as in the syzkaller \"Unable to allocate streaming EP\" crash), so the error path double-frees the usb_request with no race.\nPR:L - gadget_dev_desc_UDC_store() and uvc_function_bind() perform no capability check; access is gated only by configfs permissions, and Android/embedded USB gadget HALs routinely delegate /sys/kernel/config/usb_gadget to non-root system or daemon accounts.\nUI:N - The attacker performs the configfs UDC bind/unbind writes themselves; no victim action, cable plug, or other-user interaction is required.\nS:U - The dangling usb_request double-free corrupts kernel heap within the same kernel security authority and does not cross a VM, IOMMU, or sandbox boundary.\nC:H - usb_ep_free_request() on the stale control_req is a use-after-free of a usb_request slab object; an attacker who sprays that cache controls the freed object and can convert the UAF into kernel memory disclosure.\nI:H - The same stale pointer is a double-free through ep-\u003eops-\u003efree_request, yielding classic heap-corruption primitives (object overlap and arbitrary free) that can be leveraged into arbitrary write and control-flow hijack.\nA:H - The syzkaller report is a KASAN slab-use-after-free oops in usb_ep_free_request() on the bind error path, and the double free independently panics the kernel, which the attacker can retrigger via configfs."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-14T12:02:21.384Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/ddb1b0d5d858584ed0d3a5aaa042ee693998c7e2"
        },
        {
          "url": "https://git.kernel.org/stable/c/85dd5e8bd6776d02854f2847d83429f1f712e99c"
        },
        {
          "url": "https://git.kernel.org/stable/c/502a7f5b79b7ba751988789e982924f8f496129f"
        },
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          "url": "https://git.kernel.org/stable/c/bec7708eb3b5295d12e931db24381b7c94c72953"
        },
        {
          "url": "https://git.kernel.org/stable/c/8e88ed8a374de67270d38689f2a81018909cafbb"
        },
        {
          "url": "https://git.kernel.org/stable/c/9897b7da8c0ad8356c1b8649379fcb5a689462cb"
        },
        {
          "url": "https://git.kernel.org/stable/c/38f822ddce9355893d734279a26ddec45182197e"
        },
        {
          "url": "https://git.kernel.org/stable/c/bdab5605259ba5d6ff927c1a85cc83eb3ecfdacc"
        }
      ],
      "title": "usb: gadget: uvc: fix dangling pointers in uvc_function_bind() and uvc_function_unbind()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89733",
    "datePublished": "2026-09-11T19:46:42.613Z",
    "dateReserved": "2026-09-11T19:38:34.760Z",
    "dateUpdated": "2026-09-14T12:02:21.384Z",
    "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.