HCI Connection Creation Dangling State Reference Re-use

published 2023-07-10 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-24091

cvss: 5.9; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.6%; EPSS 0.6% chance of exploitation in 30 days, percentile 48%
public exploits: 0; none known

The bluetooth HCI host layer logic not clearing a global reference to a state pointer after handling connection events may allow a malicious HCI Controller to cause the use of a dangling reference in the host layer, leading to a crash (DoS) or potential RCE on the Host layer.

CISA SSVC

Exploitation: Proof of concept is public
Automatable: no
Technical impact: partial
Assessed: 2 y ago (2024-11-07)

Exploit prediction

0.60% chance of exploitation in the next 30 days, higher than 48% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	5.9	CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:H
NVD	3.1	8.0	CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

zephyrproject-rtos Zephyr
zephyrproject zephyr

Classification

Weakness

CWE-672 Operation on a Resource after Expiration or Release
CWE-416 Use After Free

References

github.com /zephyrproject-rtos/zephyr/security/advisories/GHSA-fx9g-8fr2-q899
vendor-advisory

Sources

CVE List CVE-2023-1902
NVD CVE-2023-1902

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.

Summary