CVE-2026-6683
4.6
CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| ChaN | FatFs | 0 <= R0.16 | affected |
Weaknesses
- CWE-369: CWE-369 Divide by zero
ADP Enrichment
CISA ADP Vulnrichment
- SSVC:
- Exploitation: none
- Automatable: no
- Technical Impact: partial
Additional References
References
- https://www.runzero.com/blog/fatfs-bugs/
- https://github.com/runZeroInc/vulns-2026-fatfs-chance
- https://elm-chan.org/fsw/ff/
- https://www.runzero.com/advisories/fatfs-exfat-divide-by-zero-cve-2026-6683
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