CVE-2026-89733 (GCVE-0-2026-89733)
Vulnerability from cvelistv5
Published
2026-09-11 19:46
Modified
2026-10-19 08:51
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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().
References
Impacted products
Vendor Product Version
Linux Linux Version: 0f9df939385527049c8062a099fbfa1479fe7ce0
Version: 0f9df939385527049c8062a099fbfa1479fe7ce0
Version: 0f9df939385527049c8062a099fbfa1479fe7ce0
Version: 0f9df939385527049c8062a099fbfa1479fe7ce0
Version: 0f9df939385527049c8062a099fbfa1479fe7ce0
Version: 0f9df939385527049c8062a099fbfa1479fe7ce0
Version: 0f9df939385527049c8062a099fbfa1479fe7ce0
Version: 0f9df939385527049c8062a099fbfa1479fe7ce0
Version: 1efa8a5aac93d9e67075995d7d4902b57ce184f7
Version: e7a4b0efe62e56a0acc81d16091c6efc2a282be8
Version: 065f5561a20659cf17aae5f72b32b5c2695c8e00
Version: 3.2.36   ≤
Version: 3.4.25   ≤
Version: 3.7.2   ≤
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{
  "containers": {
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            "drivers/usb/gadget/function/f_uvc.c"
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          ],
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      "cpeApplicability": [
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                  "vulnerable": true
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              "negate": false,
              "operator": "OR"
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          ]
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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": "2026-10-19T08:51:46.538Z",
        "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"
        },
        {
          "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": "2026-10-19T08:51:46.538Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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