CVE-2026-108952 json
RT-Thread through 5.3.0 Memory Corruption via USB CDC VCOM Driver
published 2026-10-12 28 d ago modified 2026-10-16 23 d ago also EUVD-2026-97359
- cvss
- 4.6
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 10%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- github.com/RT-Thread/rt-thread@ceef6e0 commit
- github.com/RT-Thread/rt-thread#11770 pull request
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 27 d ago
Exploit prediction
0.20% chance of exploitation in the next 30 days, higher than 10% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 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 |
| CNA | 3.1 | 4.6 | CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| CNA | 4.0 | 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
Affected products
- RT-Thread rt-thread
Classification
- Weakness
-
- CWE-843 Access of Resource Using Incompatible Type
References
-
github.com
/RT-Thread/rt-thread/pull/11770
issue-tracking, patch
-
github.com
/RT-Thread/rt-thread/commit/ceef6e0ccd646aef61b907aeb9f29269d1caba50
patch
-
github.com
/RT-Thread/rt-thread/issues/11739
issue-tracking
-
github.com
/RT-Thread/rt-thread/blob/99428a1e7f7447955aa860f7c969273a12095b8f/components/legacy/usb/usbdevice/class/cdc_v
technical-description
-
github.com
/RT-Thread/rt-thread
product
-
vulncheck.com
/advisories/rt-thread-through-5.3.0-memory-corruption-via-usb-cdc-vcom-driver
third-party-advisory
Sources
- CVE List CVE-2026-108952
- NVD CVE-2026-108952
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.