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CVE-2026-63902

Estado: Pendiente de análisisSin puntuar—

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.

Leer descripción completaMostrar menos

[ johan: use constants in header length sanity checks ]

Detalles técnicos trazas, registros y código del informe original
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()

CVSS

NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Linux — Linux KernelAI

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2026-63902",
  "cveTags": [],
  "metrics": {},
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3416eaa1f8f8d516b77de514e14cf8da256d28fb",
              "lessThan": "fcef31a5a85ccf3c313449a866ec6ed7e4132425",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "3416eaa1f8f8d516b77de514e14cf8da256d28fb",
              "lessThan": "aaa66708bfb1dca2acd219d1c1582f9f6d5492cb",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "3416eaa1f8f8d516b77de514e14cf8da256d28fb",
              "lessThan": "44f9bab8df7750a1e2a4d6cc22d7c9c2dc096aed",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "3416eaa1f8f8d516b77de514e14cf8da256d28fb",
              "lessThan": "be50533fe7068e86eb7adb81988e6d6a3f6dfe53",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "3416eaa1f8f8d516b77de514e14cf8da256d28fb",
              "lessThan": "90664556916de22467097d4c8ceb716d597a5c32",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "3416eaa1f8f8d516b77de514e14cf8da256d28fb",
              "lessThan": "ae03453f2c809ca3cf73753269fa6184dea7160f",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "3416eaa1f8f8d516b77de514e14cf8da256d28fb",
              "lessThan": "4a4cb0021ebe1fcadb52e04d19ed8d71470a530b",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "3416eaa1f8f8d516b77de514e14cf8da256d28fb",
              "lessThan": "9f9bfc80c67f35a275820da7e83a35dface08281",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "drivers/usb/serial/cypress_m8.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.26"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "2.6.26",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "5.10.259",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "status": "unaffected",
              "version": "5.15.210",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "status": "unaffected",
              "version": "6.1.176",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "status": "unaffected",
              "version": "6.6.143",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.12.93",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.35",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.0.12",
              "versionType": "semver",
              "lessThanOrEqual": "7.0.*"
            },
            {
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "drivers/usb/serial/cypress_m8.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-07-19T16:17:07.867",
  "references": [
    {
      "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",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Awaiting Analysis",
  "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's 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 ]"
    }
  ],
  "lastModified": "2026-07-27T17:44:23.777",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}