CVE-2026-64014 (GCVE-0-2026-64014)
Vulnerability from cvelistv5
Published
2026-07-19 14:56
Modified
2026-07-19 14:56
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: Input: usbtouchscreen - clamp NEXIO data_len/x_len to URB buffer size nexio_read_data() pulls data_len and x_len from a packed __be16 header in the device's interrupt packet and then walks packet->data[0..x_len) and packet->data[x_len..data_len) comparing each byte against a threshold. Both fields are 16-bit on the wire (max 65535). The existing adjustments shave at most 0x100 / 0x80 off, so the loop bound can still reach roughly 0xfeff. The URB transfer buffer for NEXIO is rept_size (1024) bytes from usb_alloc_coherent(), with the first 7 occupied by the packed header — so packet->data[] has 1017 valid bytes. read_data() callbacks are not given urb->actual_length, and nothing else bounds the walk. A device that lies about its length can get a ~64 KiB out-of-bounds read past the coherent DMA allocation. The first index whose byte exceeds NEXIO_THRESHOLD lands in begin_x / begin_y and from there into the reported touch coordinates, so adjacent kernel memory contents leak to userspace as ABS_X / ABS_Y events. Far enough out, the read can also hit an unmapped page and fault. Fix this all by clamping data_len to the buffer's data[] capacity and x_len to data_len.
References
Impacted products
Vendor Product Version
Linux Linux Version: 5197424cdcccd2b0b1922babb93969b2515c43ce
Version: 5197424cdcccd2b0b1922babb93969b2515c43ce
Version: 5197424cdcccd2b0b1922babb93969b2515c43ce
Version: 5197424cdcccd2b0b1922babb93969b2515c43ce
Version: 5197424cdcccd2b0b1922babb93969b2515c43ce
Version: 5197424cdcccd2b0b1922babb93969b2515c43ce
Version: 5197424cdcccd2b0b1922babb93969b2515c43ce
Version: 5197424cdcccd2b0b1922babb93969b2515c43ce
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/input/touchscreen/usbtouchscreen.c"
          ],
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "2.6.34"
            },
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "5.10.259",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.210",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.176",
              "versionType": "semver"
            },
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              "version": "6.6.143",
              "versionType": "semver"
            },
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              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.93",
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            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.35",
              "versionType": "semver"
            },
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              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.12",
              "versionType": "semver"
            },
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              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
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              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nInput: usbtouchscreen - clamp NEXIO data_len/x_len to URB buffer size\n\nnexio_read_data() pulls data_len and x_len from a packed __be16 header\nin the device\u0027s interrupt packet and then walks packet-\u003edata[0..x_len)\nand packet-\u003edata[x_len..data_len) comparing each byte against a\nthreshold.\n\nBoth fields are 16-bit on the wire (max 65535).  The existing\nadjustments shave at most 0x100 / 0x80 off, so the loop bound can still\nreach roughly 0xfeff.  The URB transfer buffer for NEXIO is rept_size\n(1024) bytes from usb_alloc_coherent(), with the first 7 occupied by the\npacked header \u2014 so packet-\u003edata[] has 1017 valid bytes.  read_data()\ncallbacks are not given urb-\u003eactual_length, and nothing else bounds the\nwalk.\n\nA device that lies about its length can get a ~64 KiB out-of-bounds read\npast the coherent DMA allocation.  The first index whose byte exceeds\nNEXIO_THRESHOLD lands in begin_x / begin_y and from there into the\nreported touch coordinates, so adjacent kernel memory contents leak to\nuserspace as ABS_X / ABS_Y events.  Far enough out, the read can also\nhit an unmapped page and fault.\n\nFix this all by clamping data_len to the buffer\u0027s data[] capacity and\nx_len to data_len."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-19T14:56:27.995Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/45c829e5eb3b974282bae50b7cca2cc891f74f0b"
        },
        {
          "url": "https://git.kernel.org/stable/c/e7cdcb266ba06d8480809b78ab8bb2bf8ff51ccb"
        },
        {
          "url": "https://git.kernel.org/stable/c/95f47331dfde243f93e679ce70bd0c24b37c683d"
        },
        {
          "url": "https://git.kernel.org/stable/c/d883312061ccde8c536595998aaf687ec070077c"
        },
        {
          "url": "https://git.kernel.org/stable/c/103d2de9f505f56da173e43f12dba62f92620278"
        },
        {
          "url": "https://git.kernel.org/stable/c/0ca809ea8e0355299266c46e5f1755040aa8dcf3"
        },
        {
          "url": "https://git.kernel.org/stable/c/7585b6aa55d8ac85ad22f522e1059f93507727b6"
        },
        {
          "url": "https://git.kernel.org/stable/c/2905281cbda52ec9df540113b35b835feb5fafd3"
        }
      ],
      "title": "Input: usbtouchscreen - clamp NEXIO data_len/x_len to URB buffer size",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64014",
    "datePublished": "2026-07-19T14:56:27.995Z",
    "dateReserved": "2026-07-19T07:54:57.027Z",
    "dateUpdated": "2026-07-19T14:56:27.995Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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