CVE-2026-91041 Embedded System FAT Image Mounting - Buffer Overflow

An embedded system with FAT image mounting and fault tolerance enabled contains a buffer overflow caused by out-of-bounds heap write during log replay, letting attackers achieve control of instruction pointer, exploit requires attacker-controlled FAT image.

CVSS base score 7.8 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
View the NVD record ↗

Details

Type
Buffer Overflow
Impact
Remote Code Execution
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Published
20 October 2026
Updated
20 October 2026
Weakness
CWE-787

Vendor fix

Update to the latest version with patched FAT image handling and fault tolerance.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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