CVE-2026-91041

FileX fault-tolerant log replay writes past the destination sector when mounting a crafted FAT image

State: Published
Severity: 7.8 High
Published: Oct 20, 2026
Updated: Oct 20, 2026
Reserved: Sep 23, 2026

Description

Mounting an attacker-controlled FAT image with fault tolerance enabled causes an out-of-bounds heap write during log replay. The write is attacker-positioned and attacker-valued, and on a common embedded memory layout it reaches the FX_MEDIA driver callback, giving control of the instruction pointer.

Scores

CVSS	Score	Vector	Source
3.1	7.8 High	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H	eclipse

Weaknesses

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

Affected Products

Product	Versions
Eclipse ThreadX - FileXEclipse Foundation	6.5.1.202602 and earlierAffected 6.5.2.202603Not affected

References

https://github.com/eclipse-threadx/filex/security/advisories/GHSA-c8cj-fj9j-426v

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