{"schema":"threatline.record/2","record":{"id":"CVE-2026-108952","aliases":[],"summary":"RT-Thread through 5.3.0 Memory Corruption via USB CDC VCOM Driver","details":"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.","categories":["Unclassified"],"product":"rt-thread","vendor":"RT-Thread","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-108952","source_modified_at":"2026-10-13T14:59:23.750Z","fetched_at":"2026-10-23T18:48:36.087640Z","product":"rt-thread","vendor":"RT-Thread","versions":[{"version":"0","status":"affected","versionType":"semver","lessThanOrEqual":"5.3.0"}],"defaultStatus":"unaffected"}],"fixed_versions":[],"cvss":5.1,"severity":"Medium","kev":{"listed":false},"epss":{"probability":0.00201,"percentile":0.09471,"score_date":"2026-10-23"},"published_at":"2026-10-12T12:13:04.800Z","modified_at":"2026-10-13T14:59:23.750Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-108952","fetched_at":"2026-10-23T18:48:36.087640Z","source_modified_at":"2026-10-13T14:59:23.750Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-108952","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://github.com/RT-Thread/rt-thread/issues/11739","tags":["issue-tracking"]},{"source":"CVE List","url":"https://github.com/RT-Thread/rt-thread/pull/11770","tags":["issue-tracking","patch"]},{"source":"CVE List","url":"https://github.com/RT-Thread/rt-thread/commit/ceef6e0ccd646aef61b907aeb9f29269d1caba50","tags":["patch"]},{"source":"CVE List","url":"https://github.com/RT-Thread/rt-thread/blob/99428a1e7f7447955aa860f7c969273a12095b8f/components/legacy/usb/usbdevice/class/cdc_vcom.c#L518","tags":["technical-description"]},{"source":"CVE List","url":"https://github.com/RT-Thread/rt-thread","tags":["product"]},{"source":"CVE List","url":"https://www.vulncheck.com/advisories/rt-thread-through-5.3.0-memory-corruption-via-usb-cdc-vcom-driver","tags":["third-party-advisory"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","ssvc":{"exploitation":"none","automatable":"no","technical_impact":"partial","assessed_at":"2026-10-13T14:58:00.279284Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":null,"confidence":"unknown","reviewed":false},"change_timestamp":"2026-10-13T14:59:23.750Z","content_hash":"385bf9a982cc8918b143b79617eedfce609374c34f5f1a81cc0c952bb83c2488"}}