Medium severity4.6NVD Advisory· Published Jul 1, 2026· Updated Jul 2, 2026
CVE-2026-6683
CVE-2026-6683
Description
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 products
3- Range: <=R0.16
Patches
Vulnerability mechanics
References
3- www.runzero.com/advisories/fatfs-exfat-divide-by-zero-cve-2026-6683nvdThird Party Advisory
- www.runzero.com/blog/fatfs-bugs/nvdThird Party AdvisoryExploit
- elm-chan.org/fsw/ff/nvdProduct
News mentions
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