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.
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Fixes
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References
History
Wed, 01 Jul 2026 16:30:00 +0000
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ssvc
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Wed, 01 Jul 2026 14:30:00 +0000
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| 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. | |
| Title | FatFs Divide-by-Zero in exFAT Sync | |
| Weaknesses | CWE-369 | |
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| Metrics |
cvssV3_1
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Projects
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Status: PUBLISHED
Assigner: runZero
Published:
Updated: 2026-07-01T15:24:56.449Z
Reserved: 2026-04-20T15:06:19.048Z
Link: CVE-2026-6683
Updated: 2026-07-01T15:24:51.337Z
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OpenCVE Enrichment
Updated: 2026-07-01T16:45:04Z
Weaknesses