Runzerox

**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.