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            "value": "To mitigate this vulnerability, prevent the `usbip` kernel module from loading by blacklisting it. Create a file named `/etc/modprobe.d/blacklist-usbip.conf` with the following content:\n\n```\nblacklist usbip\n```\n\nAfter creating the file, regenerate the initramfs and reboot the system for the changes to take effect. This may impact functionality that relies on USB/IP."
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusbip: validate number_of_packets in usbip_pack_ret_submit()\n\nWhen a USB/IP client receives a RET_SUBMIT response,\nusbip_pack_ret_submit() unconditionally overwrites\nurb-\u003enumber_of_packets from the network PDU. This value is\nsubsequently used as the loop bound in usbip_recv_iso() and\nusbip_pad_iso() to iterate over urb-\u003eiso_frame_desc[], a flexible\narray whose size was fixed at URB allocation time based on the\n*original* number_of_packets from the CMD_SUBMIT.\n\nA malicious USB/IP server can set number_of_packets in the response\nto a value larger than what was originally submitted, causing a heap\nout-of-bounds write when usbip_recv_iso() writes to\nurb-\u003eiso_frame_desc[i] beyond the allocated region.\n\nKASAN confirmed this with kernel 7.0.0-rc5:\n\n  BUG: KASAN: slab-out-of-bounds in usbip_recv_iso+0x46a/0x640\n  Write of size 4 at addr ffff888106351d40 by task vhci_rx/69\n\n  The buggy address is located 0 bytes to the right of\n   allocated 320-byte region [ffff888106351c00, ffff888106351d40)\n\nThe server side (stub_rx.c) and gadget side (vudc_rx.c) already\nvalidate number_of_packets in the CMD_SUBMIT path since commits\nc6688ef9f297 (\"usbip: fix stub_rx: harden CMD_SUBMIT path to handle\nmalicious input\") and b78d830f0049 (\"usbip: fix vudc_rx: harden\nCMD_SUBMIT path to handle malicious input\"). The server side validates\nagainst USBIP_MAX_ISO_PACKETS because no URB exists yet at that point.\nOn the client side we have the original URB, so we can use the tighter\nbound: the response must not exceed the original number_of_packets.\n\nThis mirrors the existing validation of actual_length against\ntransfer_buffer_length in usbip_recv_xbuff(), which checks the\nresponse value against the original allocation size.\n\nKelvin Mbogo\u0027s series (\"usb: usbip: fix integer overflow in\nusbip_recv_iso()\", v2) hardens the receive-side functions themselves;\nthis patch complements that work by catching the bad value at its\nsource -- in usbip_pack_ret_submit() before the overwrite -- and\nusing the tighter per-URB allocation bound rather than the global\nUSBIP_MAX_ISO_PACKETS limit.\n\nFix this by checking rpdu-\u003enumber_of_packets against\nurb-\u003enumber_of_packets in usbip_pack_ret_submit() before the\noverwrite. On violation, clamp to zero so that usbip_recv_iso() and\nusbip_pad_iso() safely return early."
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            {
              "lang": "en",
              "value": "AV:N - The vulnerable client-side VHCI path processes USB/IP RET_SUBMIT responses received over a TCP socket from a remote USB/IP server. A malicious or compromised server can send the crafted network PDU; physical USB access is not required.\nAC:L - No race or hard-to-control condition is required; the server sees the client CMD_SUBMIT sequence number and can reply with an oversized number_of_packets. The attacker can reasonably present or service an isochronous USB device to reach the iso descriptor path.\nPR:N - The attacker needs no privileges on the vulnerable client system and USB/IP has no authentication gate in this kernel receive path. Once acting as the remote peer, the server-controlled RET_SUBMIT fields are accepted by vhci_rx.\nUI:N - In a reasonable high-impact deployment, the USB/IP client connection may already be established or automatically managed. Exploitation is then triggered solely by the remote server\u2019s response packet without further victim action.\nS:U - The corruption occurs in the client kernel and impacts resources governed by the same kernel security authority. This is not a VM escape, IOMMU bypass, or other cross-scope boundary violation.\nC:H - The bug is heap memory corruption caused by attacker-controlled iso descriptors being written past the allocated urb-\u003eiso_frame_desc array. Such kernel memory corruption can be leveraged for information disclosure primitives, so confidentiality impact is high.\nI:H - usbip_recv_iso writes attacker-controlled descriptor fields out of bounds into adjacent kernel heap memory. This is a controlled kernel heap overwrite with plausible code execution or privilege escalation impact.\nA:H - KASAN confirmed a slab out-of-bounds write in the vhci_rx kernel thread. Even without full exploitation, a malicious server can crash or destabilize the kernel, causing high availability impact."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:23:45.870Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/324262c38438255bf6bdbf6342ca47c0badaab76"
        },
        {
          "url": "https://git.kernel.org/stable/c/973f2c250289f5bf6cc146b98aa6fdde11fe50d6"
        },
        {
          "url": "https://git.kernel.org/stable/c/ce744264b06b97069b3722511ab355738311fee0"
        },
        {
          "url": "https://git.kernel.org/stable/c/885c8591784da6314f9aa82fa460ac69f9f79e5f"
        },
        {
          "url": "https://git.kernel.org/stable/c/8d155e2d1c4102f74f82a2bf9c016164bb0f7384"
        },
        {
          "url": "https://git.kernel.org/stable/c/906f16a836de13fe61f49cdce2f66f2dbd14caf4"
        },
        {
          "url": "https://git.kernel.org/stable/c/ef8ebb1c637b4cfb61a9dd2e013376774ee2033b"
        },
        {
          "url": "https://git.kernel.org/stable/c/5e1c4ece08ccdc197177631f111845a2c68eede3"
        },
        {
          "url": "https://git.kernel.org/stable/c/2ab833a16a825373aad2ba7d54b572b277e95b71"
        }
      ],
      "title": "usbip: validate number_of_packets in usbip_pack_ret_submit()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31607",
    "datePublished": "2026-04-24T14:42:29.468Z",
    "dateReserved": "2026-03-09T15:48:24.122Z",
    "dateUpdated": "2026-08-21T12:13:01.495Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}