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.

Attack Vector Physical

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Physical

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
RT-Thread rt-thread unaffected
Version Status Constraints
0 affected ≤ 5.3.0

No data.

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Advisories

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Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/RT-Thread/rt-thread cve-icon cve-icon
https://github.com/RT-Thread/rt-thread/blob/99428a1e7f7447955aa860f7c969273a12095b8f/components/legacy/usb/usbdevice/class/cdc_vcom.c#L518 cve-icon cve-icon
https://github.com/RT-Thread/rt-thread/commit/ceef6e0ccd646aef61b907aeb9f29269d1caba50 cve-icon cve-icon
https://github.com/RT-Thread/rt-thread/issues/11739 cve-icon cve-icon
https://github.com/RT-Thread/rt-thread/pull/11770 cve-icon cve-icon
https://www.vulncheck.com/advisories/rt-thread-through-5.3.0-memory-corruption-via-usb-cdc-vcom-driver cve-icon cve-icon
History

Mon, 12 Oct 2026 12:45:00 +0000

Type Values Removed Values Added
Description 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.
Title RT-Thread through 5.3.0 Memory Corruption via USB CDC VCOM Driver
First Time appeared Thread Project
Thread Project thread
Weaknesses CWE-843
CPEs cpe:2.3:a:thread_project:thread:*:*:*:*:*:*:*:*
Vendors & Products Thread Project
Thread Project thread
References
Metrics cvssV3_1

{'score': 4.6, 'vector': 'CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

cvssV4_0

{'score': 5.1, 'vector': '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'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-10-12T12:13:04.800Z

Reserved: 2026-10-11T19:04:35.513Z

Link: CVE-2026-108952

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-10-12T13:17:28.150

Modified: 2026-10-12T13:17:28.150

Link: CVE-2026-108952

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-12T13:30:13Z

Weaknesses