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CVE-2026-6683 is a divide-by-zero vulnerability in FatFs R0.16 and earlier affecting exFAT sync and write logic. During write/sync operations on crafted exFAT media, attacker-controlled metadata can cause the expression n_fatent - 2 to evaluate to zero, triggering a divide-by-zero condition in the exFAT sync path. The issue is reachable when a vulnerable device processes malformed exFAT filesystem data, typically from removable media such as USB or SD storage, and in some deployments through firmware or OTA update pipelines that ingest filesystem images.
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What an attacker gets, and what they’ve been doing with it.
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No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
14 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A medium-severity exFAT divide-by-zero flaw in FatFs sync/write paths that can cause reliable crashes and potential device bricking, including in firmware update scenarios.
A divide-by-zero vulnerability in FatFs exFAT handling that can crash devices and potentially brick hardware during firmware updates.
A divide-by-zero vulnerability in FatFs exFAT sync/write paths that can be triggered via crafted media to cause reliable crashes.
A divide-by-zero flaw in FatFs exFAT handling that can crash devices and potentially brick hardware during update flows.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.