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CVE-2026-6683

MediumPublished

FatFs Divide-by-Zero in exFAT Sync

Published: Jul 1, 2026
Updated: Jul 1, 2026
Assigning CNA: runZero
Evidence observed: Aug 16, 2026

Primary CVSS

4.6/ 10Medium

nvd · CVSS 3.1

CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS probability estimate

0.3%

Low · next 30 days

Percentile: 23.5%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

FatFs R0.16 and earlier contains a divide-by-zero in exFAT sync logic bug when crafted metadata causes n_fatent - 2 to be zero during write/sync operations. This maps to CWE-369 (Divide By Zero). Estimated CVSS v3.1 vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H (4.6, Medium). Network-delivered update media can make this remote in some pipelines. The estimated CISA SSVC vectors are Exploitation: PoC, Technical Impact: Partial.

Sources

vulns-2026-fatfs-chanceResearch
Documented security vulnerabilities in the FatFs embedded filesystem library with CVE details, fuzzing harness, exploit disk-image generator, and supply-chain impact analysis across dozens of downstream firmware projects.

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