In FatFS R0.16 and earlier contains a FAT32 integer overflow bug in mount_volume() where fasize *= fs->n_fats can wrap, leading to attacker-controlled file-size metadata and unsafe read lengths in downstream callers. This maps to CWE-190 (Integer Overflow or Wraparound). Estimated CVSS v3.1 vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H (7.6, High). Remote delivery is also possible in OTA/update pipelines. The estimated CISA SSVC vectors are Exploitation: PoC, Technical Impact: Total.
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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 | In FatFS R0.16 and earlier contains a FAT32 integer overflow bug in mount_volume() where fasize *= fs->n_fats can wrap, leading to attacker-controlled file-size metadata and unsafe read lengths in downstream callers. This maps to CWE-190 (Integer Overflow or Wraparound). Estimated CVSS v3.1 vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H (7.6, High). Remote delivery is also possible in OTA/update pipelines. The estimated CISA SSVC vectors are Exploitation: PoC, Technical Impact: Total. | |
| Title | FatFs Integer Overflow in FAT32 Volume Mount | |
| Weaknesses | CWE-190 | |
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| Metrics |
cvssV3_1
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Status: PUBLISHED
Assigner: runZero
Published:
Updated: 2026-07-01T15:24:05.860Z
Reserved: 2026-04-20T15:06:18.243Z
Link: CVE-2026-6682
Updated: 2026-07-01T15:23:59.950Z
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OpenCVE Enrichment
Updated: 2026-07-01T16:45:04Z
Weaknesses