Vulnerability DatabaseCVE-2026-108952
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CVE-2026-108952
Published:October 12, 2026
Updated:October 13, 2026
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.
Related Resources (8)
https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/108xxx/CVE-2026-108952.json
https://github.com/RT-Thread/rt-thread/blob/99428a1e7f7447955aa860f7c969273a12095b8f/components/legacy/usb/usbdevice/class/cdc_vcom.c#L518
https://www.vulncheck.com/advisories/rt-thread-through-5.3.0-memory-corruption-via-usb-cdc-vcom-driver
https://nvd.nist.gov/vuln/detail/CVE-2026-108952
https://github.com/RT-Thread/rt-thread/commit/ceef6e0ccd646aef61b907aeb9f29269d1caba50
https://github.com/RT-Thread/rt-thread
https://github.com/RT-Thread/rt-thread/pull/11770
https://github.com/RT-Thread/rt-thread/issues/11739
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CVSS v4
Base Score:
5.1
Attack Vector
PHYSICAL
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
4.6
Attack Vector
PHYSICAL
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
Access of Resource Using Incompatible Type ('Type Confusion')
CWE-843
EPSS
Base Score:
0.20