PT-2026-54927 · Fatfs · Fatfs
Hd Moore
+2
·
Published
2026-07-01
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Updated
2026-07-06
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CVE-2026-6685
CVSS v3.1
6.1
Medium
| Vector | AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H |
Name of the Vulnerable Software and Affected Versions
FatFs versions R0.16 and earlier
Description
An integer underflow occurs during interleaved read and write operations on fragmented filesystems. This issue is caused by an unsigned-subtraction wrap in the
f read() and f write() functions when evaluating the condition fp->sect - sect < cc, which leads to a stale dirty-cache skip.Recommendations
At the moment, there is no information about a newer version that contains a fix for this vulnerability.
Exploit
Integer Underflow
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Weakness Enumeration
Related Identifiers
Affected Products
Fatfs