CVE-2026-63902 (GCVE-0-2026-63902)
Vulnerability from cvelistv5
Published
2026-07-19 14:55
Modified
2026-07-19 14:55
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: USB: serial: cypress_m8: validate interrupt packet headers cypress_read_int_callback() parses the interrupt-in buffer according to the selected Cypress packet format. Format 1 has a two-byte status/count header and format 2 has a one-byte combined status/count header. The usb-serial core sizes the interrupt-in buffer from the endpoint descriptor's wMaxPacketSize, and successful interrupt transfers can complete short when URB_SHORT_NOT_OK is not set. Check that the completed packet contains the selected header before reading it. Malformed short reports are ignored and the interrupt URB is resubmitted through the existing retry path, preventing out-of-bounds header-byte reads. KASAN report as below: KASAN slab-out-of-bounds in cypress_read_int_callback+0x240/0x7f0 Read of size 1 Call trace: cypress_read_int_callback() (drivers/usb/serial/cypress_m8.c:1009) __usb_hcd_giveback_urb() dummy_timer() [ johan: use constants in header length sanity checks ]
References
Impacted products
Vendor Product Version
Linux Linux Version: 3416eaa1f8f8d516b77de514e14cf8da256d28fb
Version: 3416eaa1f8f8d516b77de514e14cf8da256d28fb
Version: 3416eaa1f8f8d516b77de514e14cf8da256d28fb
Version: 3416eaa1f8f8d516b77de514e14cf8da256d28fb
Version: 3416eaa1f8f8d516b77de514e14cf8da256d28fb
Version: 3416eaa1f8f8d516b77de514e14cf8da256d28fb
Version: 3416eaa1f8f8d516b77de514e14cf8da256d28fb
Version: 3416eaa1f8f8d516b77de514e14cf8da256d28fb
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/usb/serial/cypress_m8.c"
          ],
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          "product": "Linux",
          "programFiles": [
            "drivers/usb/serial/cypress_m8.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.26"
            },
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "5.10.259",
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            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.210",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.176",
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            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.143",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.93",
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              "status": "unaffected",
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            },
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              "lessThanOrEqual": "7.0.*",
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              "version": "7.0.12",
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              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
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              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nUSB: serial: cypress_m8: validate interrupt packet headers\n\ncypress_read_int_callback() parses the interrupt-in buffer according to\nthe selected Cypress packet format. Format 1 has a two-byte status/count\nheader and format 2 has a one-byte combined status/count header. The\nusb-serial core sizes the interrupt-in buffer from the endpoint\ndescriptor\u0027s wMaxPacketSize, and successful interrupt transfers can\ncomplete short when URB_SHORT_NOT_OK is not set.\n\nCheck that the completed packet contains the selected header before\nreading it. Malformed short reports are ignored and the interrupt URB is\nresubmitted through the existing retry path, preventing out-of-bounds\nheader-byte reads.\n\nKASAN report as below:\nKASAN slab-out-of-bounds in cypress_read_int_callback+0x240/0x7f0\nRead of size 1\nCall trace:\n  cypress_read_int_callback() (drivers/usb/serial/cypress_m8.c:1009)\n  __usb_hcd_giveback_urb()\n  dummy_timer()\n\n[ johan: use constants in header length sanity checks ]"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-19T14:55:10.267Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/fcef31a5a85ccf3c313449a866ec6ed7e4132425"
        },
        {
          "url": "https://git.kernel.org/stable/c/aaa66708bfb1dca2acd219d1c1582f9f6d5492cb"
        },
        {
          "url": "https://git.kernel.org/stable/c/44f9bab8df7750a1e2a4d6cc22d7c9c2dc096aed"
        },
        {
          "url": "https://git.kernel.org/stable/c/be50533fe7068e86eb7adb81988e6d6a3f6dfe53"
        },
        {
          "url": "https://git.kernel.org/stable/c/90664556916de22467097d4c8ceb716d597a5c32"
        },
        {
          "url": "https://git.kernel.org/stable/c/ae03453f2c809ca3cf73753269fa6184dea7160f"
        },
        {
          "url": "https://git.kernel.org/stable/c/4a4cb0021ebe1fcadb52e04d19ed8d71470a530b"
        },
        {
          "url": "https://git.kernel.org/stable/c/9f9bfc80c67f35a275820da7e83a35dface08281"
        }
      ],
      "title": "USB: serial: cypress_m8: validate interrupt packet headers",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-63902",
    "datePublished": "2026-07-19T14:55:10.267Z",
    "dateReserved": "2026-07-19T07:54:57.019Z",
    "dateUpdated": "2026-07-19T14:55:10.267Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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