FKIE_CVE-2026-63902

Vulnerability from fkie_nvd - Published: 2026-07-19 16:17 - Updated: 2026-07-19 16:17
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
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/44f9bab8df7750a1e2a4d6cc22d7c9c2dc096aed
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4a4cb0021ebe1fcadb52e04d19ed8d71470a530b
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/90664556916de22467097d4c8ceb716d597a5c32
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9f9bfc80c67f35a275820da7e83a35dface08281
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/aaa66708bfb1dca2acd219d1c1582f9f6d5492cb
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ae03453f2c809ca3cf73753269fa6184dea7160f
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/be50533fe7068e86eb7adb81988e6d6a3f6dfe53
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/fcef31a5a85ccf3c313449a866ec6ed7e4132425
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "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": [
            {
              "lessThan": "fcef31a5a85ccf3c313449a866ec6ed7e4132425",
              "status": "affected",
              "version": "3416eaa1f8f8d516b77de514e14cf8da256d28fb",
              "versionType": "git"
            },
            {
              "lessThan": "aaa66708bfb1dca2acd219d1c1582f9f6d5492cb",
              "status": "affected",
              "version": "3416eaa1f8f8d516b77de514e14cf8da256d28fb",
              "versionType": "git"
            },
            {
              "lessThan": "44f9bab8df7750a1e2a4d6cc22d7c9c2dc096aed",
              "status": "affected",
              "version": "3416eaa1f8f8d516b77de514e14cf8da256d28fb",
              "versionType": "git"
            },
            {
              "lessThan": "be50533fe7068e86eb7adb81988e6d6a3f6dfe53",
              "status": "affected",
              "version": "3416eaa1f8f8d516b77de514e14cf8da256d28fb",
              "versionType": "git"
            },
            {
              "lessThan": "90664556916de22467097d4c8ceb716d597a5c32",
              "status": "affected",
              "version": "3416eaa1f8f8d516b77de514e14cf8da256d28fb",
              "versionType": "git"
            },
            {
              "lessThan": "ae03453f2c809ca3cf73753269fa6184dea7160f",
              "status": "affected",
              "version": "3416eaa1f8f8d516b77de514e14cf8da256d28fb",
              "versionType": "git"
            },
            {
              "lessThan": "4a4cb0021ebe1fcadb52e04d19ed8d71470a530b",
              "status": "affected",
              "version": "3416eaa1f8f8d516b77de514e14cf8da256d28fb",
              "versionType": "git"
            },
            {
              "lessThan": "9f9bfc80c67f35a275820da7e83a35dface08281",
              "status": "affected",
              "version": "3416eaa1f8f8d516b77de514e14cf8da256d28fb",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "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"
            },
            {
              "lessThan": "2.6.26",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "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"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.143",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.93",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.35",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.12",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "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 ]"
    }
  ],
  "id": "CVE-2026-63902",
  "lastModified": "2026-07-19T16:17:07.867",
  "metrics": {},
  "published": "2026-07-19T16:17:07.867",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/44f9bab8df7750a1e2a4d6cc22d7c9c2dc096aed"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/4a4cb0021ebe1fcadb52e04d19ed8d71470a530b"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/90664556916de22467097d4c8ceb716d597a5c32"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/9f9bfc80c67f35a275820da7e83a35dface08281"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/aaa66708bfb1dca2acd219d1c1582f9f6d5492cb"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ae03453f2c809ca3cf73753269fa6184dea7160f"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/be50533fe7068e86eb7adb81988e6d6a3f6dfe53"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/fcef31a5a85ccf3c313449a866ec6ed7e4132425"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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