CVE-2026-108952CWE-843

CVE-2026-108952

Medium · published October 12, 2026

CVSS v3.1
4.6
EPSS
0%
Percentile
9.5
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
4.6 · MEDIUM
Vector
CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
5.1 · 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
EPSS
0.00201 · 9.5th percentile
Weakness
CWE-843 · Access of Resource Using Incompatible Type ('Type Confusion')
Published
2026-10-12T17:17Z
References (6)
https://github.com/RT-Thread/rt-thread · [email protected]https://github.com/RT-Thread/rt-thread/blob/99428a1e7f7447955aa860f7c969273a12095b8f/components/legacy/usb/usbdevice/class/cdc_vcom.c#L518 · [email protected]https://github.com/RT-Thread/rt-thread/commit/ceef6e0ccd646aef61b907aeb9f29269d1caba50 · [email protected]https://github.com/RT-Thread/rt-thread/issues/11739 · [email protected]https://github.com/RT-Thread/rt-thread/pull/11770 · [email protected]https://www.vulncheck.com/advisories/rt-thread-through-5.3.0-memory-corruption-via-usb-cdc-vcom-driver · [email protected]
EPSS history
Timeline
  • 14 OCT 03:27Z
    EPSS moved — → 0%
    epss
  • 12 OCT 12:13Z
    RT-Thread through 5.3.0 Memory Corruption via USB CDC VCOM Driver
    cvelistv5
  • 12 OCT 12:13Z
    RT-Thread through 5.3.0 Memory Corruption via USB CDC VCOM Driver
    cvelistv5