CVE-2026-64270 (GCVE-0-2026-64270)

Vulnerability from cvelistv5 – Published: 2026-07-25 08:49 – Updated: 2026-08-23 12:45
VLAI
Title
Input: mms114 - reject an oversized device packet size
Summary
In the Linux kernel, the following vulnerability has been resolved: Input: mms114 - reject an oversized device packet size mms114_interrupt() reads a packet of touch data from the device into a fixed-size on-stack buffer struct mms114_touch touch[MMS114_MAX_TOUCH]; which holds MMS114_MAX_TOUCH (10) events of MMS114_EVENT_SIZE (8) bytes, i.e. 80 bytes. The length of the I2C read into it is taken verbatim from the device: packet_size = mms114_read_reg(data, MMS114_PACKET_SIZE); if (packet_size <= 0) goto out; ... error = __mms114_read_reg(data, MMS114_INFORMATION, packet_size, (u8 *)touch); packet_size is a single device register byte (0x0F) and the only check is the lower bound packet_size <= 0; it is never bounded against the size of touch[]. A malfunctioning, malicious or counterfeit controller (or an attacker tampering with the I2C bus) can report a packet_size of up to 255, so __mms114_read_reg() writes up to 175 bytes past the end of touch[] on the IRQ-thread stack: a stack out-of-bounds write that can overwrite the stack canary, saved registers and the return address. A well-formed device never reports more than the buffer holds, so reject an oversized packet and drop the report, consistent with the handler's other error paths, rather than reading past the buffer.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7033 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 07b8481d4aff73d6f451f25e74ea10240ff5131e , < 040843281eebfa110d08fd7fb083fe6cb55cea14 (git)
Affected: 07b8481d4aff73d6f451f25e74ea10240ff5131e , < 39b12daf1adb80f9595fdfe584961deb80860cbb (git)
Affected: 07b8481d4aff73d6f451f25e74ea10240ff5131e , < d99ba93c35ff2d5276e9c2632967481bd53a79d0 (git)
Affected: 07b8481d4aff73d6f451f25e74ea10240ff5131e , < 5d2ea15ba03bf17ed143ff1a0995a4206edc3fb6 (git)
Affected: 07b8481d4aff73d6f451f25e74ea10240ff5131e , < b78150729762d47c14fe29a2582bdca5568e62b8 (git)
Affected: 07b8481d4aff73d6f451f25e74ea10240ff5131e , < 8301c335305344d4da4ab9442b6a399dacfe5b8d (git)
Affected: 07b8481d4aff73d6f451f25e74ea10240ff5131e , < f3d5e77b27fded71dcb97f409262bf0abba0410e (git)
Affected: 07b8481d4aff73d6f451f25e74ea10240ff5131e , < 66725039f7090afe14c31bd259e2059a68f04023 (git)
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Linux Linux Affected: 3.6
Unaffected: 0 , < 3.6 (semver)
Unaffected: 5.10.266 , ≤ 5.10.* (semver)
Unaffected: 5.15.217 , ≤ 5.15.* (semver)
Unaffected: 6.1.184 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.96 , ≤ 6.12.* (semver)
Unaffected: 6.18.39 , ≤ 6.18.* (semver)
Unaffected: 7.1.4 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nInput: mms114 - reject an oversized device packet size\n\nmms114_interrupt() reads a packet of touch data from the device into a\nfixed-size on-stack buffer\n\n\tstruct mms114_touch touch[MMS114_MAX_TOUCH];\n\nwhich holds MMS114_MAX_TOUCH (10) events of MMS114_EVENT_SIZE (8) bytes,\ni.e. 80 bytes. The length of the I2C read into it is taken verbatim from\nthe device:\n\n\tpacket_size = mms114_read_reg(data, MMS114_PACKET_SIZE);\n\tif (packet_size \u003c= 0)\n\t\tgoto out;\n\t...\n\terror = __mms114_read_reg(data, MMS114_INFORMATION, packet_size,\n\t\t\t(u8 *)touch);\n\npacket_size is a single device register byte (0x0F) and the only check\nis the lower bound packet_size \u003c= 0; it is never bounded against the\nsize of touch[]. A malfunctioning, malicious or counterfeit controller\n(or an attacker tampering with the I2C bus) can report a packet_size of\nup to 255, so __mms114_read_reg() writes up to 175 bytes past the end of\ntouch[] on the IRQ-thread stack: a stack out-of-bounds write that can\noverwrite the stack canary, saved registers and the return address.\n\nA well-formed device never reports more than the buffer holds, so reject\nan oversized packet and drop the report, consistent with the handler\u0027s\nother error paths, rather than reading past the buffer."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nEntrada: mms114 - rechazar un tama\u00f1o de paquete de dispositivo sobredimensionado\n\nmms114_interrupt() lee un paquete de datos t\u00e1ctiles del dispositivo en un b\u00fafer de tama\u00f1o fijo en la pila\n\n\tstruct mms114_touch touch[MMS114_MAX_TOUCH];\n\nque contiene MMS114_MAX_TOUCH (10) eventos de MMS114_EVENT_SIZE (8) bytes, es decir, 80 bytes. La longitud de la lectura I2C en \u00e9l se toma textualmente del dispositivo:\n\n\tpacket_size = mms114_read_reg(data, MMS114_PACKET_SIZE);\n\tif (packet_size menor o igual que 0)\n\t\tgoto out;\n\t...\n\terror = __mms114_read_reg(data, MMS114_INFORMATION, packet_size,\n\t\t\t(u8 *)touch);\n\npacket_size es un solo byte de registro del dispositivo (0x0F) y la \u00fanica comprobaci\u00f3n es el l\u00edmite inferior packet_size menor o igual que 0; nunca se limita contra el tama\u00f1o de touch[]. Un controlador defectuoso, malicioso o falsificado (o un atacante manipulando el bus I2C) puede informar un packet_size de hasta 255, por lo que __mms114_read_reg() escribe hasta 175 bytes m\u00e1s all\u00e1 del final de touch[] en la pila del hilo IRQ: una escritura fuera de l\u00edmites de la pila que puede sobrescribir el canario de la pila, los registros guardados y la direcci\u00f3n de retorno.\n\nUn dispositivo bien formado nunca informa m\u00e1s de lo que contiene el b\u00fafer, por lo tanto, rechazar un paquete sobredimensionado y descartar el informe, consistente con otras rutas de error del gestor, en lugar de leer m\u00e1s all\u00e1 del b\u00fafer."
          }
        ],
        "id": "CVE-2026-64270",
        "lastModified": "2026-10-24T13:10:00.147",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 5.9,
              "source": "nvd@nist.gov",
              "type": "Primary"
            }
          ]
        },
        "published": "2026-07-25T10:17:07.293",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/040843281eebfa110d08fd7fb083fe6cb55cea14"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/39b12daf1adb80f9595fdfe584961deb80860cbb"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/5d2ea15ba03bf17ed143ff1a0995a4206edc3fb6"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/66725039f7090afe14c31bd259e2059a68f04023"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/8301c335305344d4da4ab9442b6a399dacfe5b8d"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/b78150729762d47c14fe29a2582bdca5568e62b8"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/d99ba93c35ff2d5276e9c2632967481bd53a79d0"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/f3d5e77b27fded71dcb97f409262bf0abba0410e"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-787"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-10-19T23:36:39+00:00",
      "cve": "CVE-2026-64270",
      "id": "CVE-2026-64270",
      "initial_release_date": "2026-07-25T00:00:00+00:00",
      "product_status:known_not_affected": "275",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Input: mms114 - reject an oversized device packet size",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64270.json",
      "version": "3"
    }
  }
}



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