CVEvulnerability
CVE-2026-6684
4.6 MEDIUM
Official page ↗
- Status
- Analyzed
- Published
- 2026-07-01
- Last modified
- 2026-10-25
- Assigner
- 44488dab-36db-4358-99f9-bc116477f914
- CVSS 3.1 (44488dab-36db-4358-99f9-bc116477f914)
- 4.6 MEDIUM — CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weaknesses
- CWE-835
Description
FatFs prior to R0.16 that use GPT scanning with 'FF_LBA64 = 1' contains an issue where an unbounded loop count derived from GPT header field GPTH_PtNum, enabling extremely long or effectively infinite mount-time scans. This maps to CWE-835 (Loop with Unreachable Exit Condition). 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). The estimated CISA SSVC vectors are Exploitation: PoC, Technical Impact: Partial.
Affected configurations
• elm-chan fatfs (< r0.16)
Related
Weakness · CWE (1)
- CWE-835 Loop with Unreachable Exit Condition weakness
References
- https://elm-chan.org/fsw/ff/ Product
- https://github.com/runZeroInc/vulns-2026-fatfs-chance Third Party Advisory, Exploit
- https://www.runzero.com/advisories/fatfs-gpt-scan-loop-dos-cve-2026-6684/ Third Party Advisory
- https://www.runzero.com/blog/fatfs-bugs/ Third Party Advisory, Exploit
- https://github.com/runZeroInc/vulns-2026-fatfs-chance Third Party Advisory, Exploit