Out-of-bounds Write via NAND Metadata Parsing at Mount in LevelX

published 2026-09-29 40 d ago modified 2026-11-04 4 d ago also EUVD-2026-89201

cvss: 8.6; version 4.0, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.1%; EPSS 0.1% chance of exploitation in 30 days, percentile 1%
public exploits: 0; none known

Mounting an attacker-controlled NAND flash image (`lx_nand_flash_open()`) triggers an unbounded out-of-bounds heap **write** in LevelX's NAND flash-translation-layer metadata parser that overwrites a driver function pointer in the control block, giving a demonstrated control-flow hijack — RIP set to a full 8-byte attacker-chosen value (register-verified). Two accompanying OOB reads. All reproduced verbatim under ASan at HEAD `9f1cfdc`.

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: total
Assessed: 40 d ago (2026-09-29)

Exploit prediction

0.12% chance of exploitation in the next 30 days, higher than 1% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	4.0	8.6	CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CNA	4.0	8.6	CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/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

Eclipse Foundation Eclipse ThreadX NetX Duo

Classification

Weakness

CWE-787 Out-of-bounds Write
CWE-1284 Improper Validation of Specified Quantity in Input

References

github.com /eclipse-threadx/levelx/security/advisories/GHSA-q6ph-7238-777g

Sources

CVE List CVE-2026-102730
NVD CVE-2026-102730

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Summary