{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-89733",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-89733"
  ],
  "published": "2026-09-11T19:47:07Z",
  "summary": "usb: gadget: uvc: fix dangling pointers in uvc_function_bind() and uvc_function_unbind()",
  "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->control_req but does not set it to NULL afterwards. Thus,\nuvc->control_req is a dangling pointer causing a UAF. Also we do not set\nthe uvc->control_buf pointer to NULL after freeing it, which is another\ndangling pointer. Fix it by setting uvc->control_req to NULL after we run\nusb_ep_free_request() and uvc->control_buf to NULL after kfree. Do the\nsame for uvc_function_unbind().",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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            "linux_commit": "95b85bebbedcaedfa7ca79116ed38b7376fba412",
            "upstream_version": "6.18.33",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.50"
          },
          "1:6.18.34-1+rpt1": {
            "linux_commit": "c8c7494100e99ee05b11aaa4f0588a223a63d1af",
            "upstream_version": "6.18.34",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.50"
          },
          "1:6.18.39-1+rpt1": {
            "linux_commit": "60ea684a8ace97bb0db1a16e20753bdd6ab371ff",
            "upstream_version": "6.18.39",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.50"
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-89733"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ddb1b0d5d858584ed0d3a5aaa042ee693998c7e2"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/85dd5e8bd6776d02854f2847d83429f1f712e99c"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/502a7f5b79b7ba751988789e982924f8f496129f"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/bec7708eb3b5295d12e931db24381b7c94c72953"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/8e88ed8a374de67270d38689f2a81018909cafbb"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/9897b7da8c0ad8356c1b8649379fcb5a689462cb"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/38f822ddce9355893d734279a26ddec45182197e"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/bdab5605259ba5d6ff927c1a85cc83eb3ecfdacc"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-09-14T12:06:03Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The UAF is reached by local writes to /sys/kernel/config/usb_gadget/<g>/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->control_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->ops->free_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."
    }
  }
}