{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-108952",
        "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
        "state": "PUBLISHED",
        "assignerShortName": "VulnCheck",
        "dateReserved": "2026-10-11T19:04:35.513Z",
        "datePublished": "2026-10-12T12:13:04.800Z",
        "dateUpdated": "2026-10-12T12:13:04.800Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
                "shortName": "VulnCheck",
                "dateUpdated": "2026-10-12T12:13:04.800Z"
            },
            "datePublic": "2026-08-23T00:00:00.000Z",
            "title": "RT-Thread through 5.3.0 Memory Corruption via USB CDC VCOM Driver",
            "descriptions": [
                {
                    "lang": "en",
                    "value": "RT-Thread through 5.3.0 contains a memory corruption vulnerability in the legacy USB CDC virtual COM port driver that aliases rx_ringbuffer as a Serial V2 rt_serial_rx_fifo in _function_enable(). A connected USB host configuring the CDC device triggers writes past the ring buffer into struct vcom members and an invalid rt_free() on close, causing denial of service."
                }
            ],
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "lang": "en",
                            "description": "Access of Resource Using Incompatible Type ('Type Confusion')",
                            "cweId": "CWE-843",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "affected": [
                {
                    "vendor": "RT-Thread",
                    "product": "rt-thread",
                    "defaultStatus": "unaffected",
                    "versions": [
                        {
                            "version": "0",
                            "status": "affected",
                            "versionType": "semver",
                            "lessThanOrEqual": "5.3.0"
                        }
                    ]
                }
            ],
            "cpeApplicability": [
                {
                    "nodes": [
                        {
                            "operator": "OR",
                            "negate": false,
                            "cpeMatch": [
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:a:thread_project:thread:*:*:*:*:*:*:*:*",
                                    "versionEndIncluding": "5.3.0"
                                }
                            ]
                        }
                    ]
                }
            ],
            "metrics": [
                {
                    "format": "CVSS",
                    "cvssV4_0": {
                        "version": "4.0",
                        "vectorString": "CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
                        "attackVector": "PHYSICAL",
                        "attackComplexity": "LOW",
                        "attackRequirements": "NONE",
                        "privilegesRequired": "NONE",
                        "userInteraction": "NONE",
                        "vulnConfidentialityImpact": "NONE",
                        "vulnIntegrityImpact": "NONE",
                        "vulnAvailabilityImpact": "HIGH",
                        "subConfidentialityImpact": "NONE",
                        "subIntegrityImpact": "NONE",
                        "subAvailabilityImpact": "NONE",
                        "baseScore": 5.1,
                        "baseSeverity": "MEDIUM"
                    }
                },
                {
                    "format": "CVSS",
                    "cvssV3_1": {
                        "version": "3.1",
                        "vectorString": "CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                        "attackVector": "PHYSICAL",
                        "attackComplexity": "LOW",
                        "privilegesRequired": "NONE",
                        "userInteraction": "NONE",
                        "scope": "UNCHANGED",
                        "confidentialityImpact": "NONE",
                        "integrityImpact": "NONE",
                        "availabilityImpact": "HIGH",
                        "baseScore": 4.6,
                        "baseSeverity": "MEDIUM"
                    }
                }
            ],
            "references": [
                {
                    "url": "https://github.com/RT-Thread/rt-thread/issues/11739",
                    "tags": [
                        "issue-tracking"
                    ]
                },
                {
                    "url": "https://github.com/RT-Thread/rt-thread/pull/11770",
                    "tags": [
                        "issue-tracking",
                        "patch"
                    ]
                },
                {
                    "url": "https://github.com/RT-Thread/rt-thread/commit/ceef6e0ccd646aef61b907aeb9f29269d1caba50",
                    "tags": [
                        "patch"
                    ]
                },
                {
                    "url": "https://github.com/RT-Thread/rt-thread/blob/99428a1e7f7447955aa860f7c969273a12095b8f/components/legacy/usb/usbdevice/class/cdc_vcom.c#L518",
                    "tags": [
                        "technical-description"
                    ]
                },
                {
                    "url": "https://github.com/RT-Thread/rt-thread",
                    "tags": [
                        "product"
                    ]
                },
                {
                    "name": "VulnCheck Advisory: RT-Thread through 5.3.0 Memory Corruption via USB CDC VCOM Driver",
                    "tags": [
                        "third-party-advisory"
                    ],
                    "url": "https://www.vulncheck.com/advisories/rt-thread-through-5.3.0-memory-corruption-via-usb-cdc-vcom-driver"
                }
            ],
            "credits": [
                {
                    "lang": "en",
                    "value": "Jaeyeong Lee",
                    "type": "finder"
                },
                {
                    "lang": "en",
                    "value": "Ijae Kim",
                    "type": "finder"
                },
                {
                    "lang": "en",
                    "value": "Myeonghun Pak",
                    "type": "finder"
                },
                {
                    "lang": "en",
                    "value": "Yuho Choi",
                    "type": "finder"
                },
                {
                    "lang": "en",
                    "value": "Taegyu Kim",
                    "type": "finder"
                }
            ],
            "x_generator": {
                "engine": "vulncheck-endgame"
            }
        }
    }
}