CVE-2026-6686

Description

FatFs R0.16 and earlier contains an uninitialized cluster exposure when f_lseek() extends files beyond EOF without zero-filling newly allocated clusters. This maps to CWE-908 (Use of Uninitialized Resource). Estimated CVSS v3.1 vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N (4.6, Medium). The estimated CISA SSVC vectors are Exploitation: PoC, Technical Impact: Partial.

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Produits concernés

• ChaN FatFs
• Elm-chan fatfs

Scores CVSS

Faiblesses (CWE)

• CWE-908

Références

• https://elm-chan.org/fsw/ff/ Product
• https://github.com/runZeroInc/vulns-2026-fatfs-chance Third Party AdvisoryExploit
• https://www.runzero.com/advisories/fatfs-uninit-cluster-exposure-cve-2026-6686/ Third Party Advisory
• https://www.runzero.com/blog/fatfs-bugs/ Third Party AdvisoryExploit
• https://github.com/runZeroInc/vulns-2026-fatfs-chance Third Party AdvisoryExploit

Ailleurs

• NVD
• CVE.org
• CIRCL Vulnerability-Lookup
• CERT-FR
• GitHub Advisories