CVE-2019-18425

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: HIGH) published 2022-05-24. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 3%CVSS: 9.8Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

An issue was discovered in Xen through 4.12.x allowing 32-bit PV guest OS users to gain guest OS privileges by installing and using descriptors. There is missing descriptor table limit checking in x86 PV emulation. When emulating certain PV guest operations, descriptor table accesses are performed by the emulating code. Such accesses should respect the guest specified limits, unless otherwise guaranteed to fail in such a case. Without this, emulation of 32-bit guest user mode calls through call gates would allow guest user mode to install and then use descriptors of their choice, as long as the guest kernel did not itself install an LDT. (Most OSes don't install any LDT by default). 32-bit PV guest user mode can elevate its privileges to that of the guest kernel. Xen versions from at least 3.2 onwards are affected. Only 32-bit PV guest user mode can leverage this vulnerability. HVM, PVH, as well as 64-bit PV guests cannot leverage this vulnerability. Arm systems are unaffected.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
50(Track)
EG Risk 50/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation3% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
83.4%
KEV
Not listed

Published

October 31, 2019

Last Modified

November 21, 2024

Advisory Details (7)

Auto-updated Jul 1, 2026
No patch confirmed yet.
generic

Xen: Multiple vulnerabilities (GLSA 202003-56) — Gentoo security

https://security.gentoo.org/glsa/202003-56
generic

Bugtraq: [SECURITY] [DSA 4602-1] xen security update

https://seclists.org/bugtraq/2020/Jan/21
generic

[SECURITY] Fedora 30 Update: xen-4.11.2-3.fc30 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IZYATWNUGHRBG6I3TC24YHP5Y3J7I6KH/
generic

[SECURITY] Fedora 31 Update: xen-4.12.1-6.fc31 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/I5WWPW4BSZDDW7VHU427XTVXV7ROOFFW/
generic

[SECURITY] Fedora 29 Update: xen-4.11.2-2.fc29 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2BQKX7M2RHCWDBKNPX4KEBI3MJIH6AYZ/
generic

XSA-298 - Xen Security Advisories

http://xenbits.xen.org/xsa/advisory-298.html
generic

oss-security - Xen Security Advisory 298 v3 (CVE-2019-18425) - missing descriptor table limit checking in x86 PV emulation

http://www.openwall.com/lists/oss-security/2019/10/31/2

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 16× in last 7d / 48× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-23 14:15 UTCEPSS rescore
  2. 2026-07-23 01:42 UTCEG score recompute
  3. 2026-07-22 22:22 UTCEG score recompute
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  1. 2026-07-09 19:06 UTCEPSS rescore
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  9. 2026-07-02 17:27 UTCOSV refresh
  10. 2026-07-01 15:03 UTCEPSS rescore
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  37. 2026-06-14 15:43 UTCOSV refresh
  38. 2026-06-13 22:58 UTCEPSS rescore
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  63. 2026-05-27 12:24 UTCEG score recompute
  64. 2026-05-27 12:24 UTCGHSA enrichment
  65. 2026-05-26 13:42 UTCEPSS rescore
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  70. 2026-05-25 03:19 UTCOSV refresh

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Frequently asked(5)

What is CVE-2019-18425?
CVE-2019-18425 is a critical vulnerability published on October 31, 2019. An issue was discovered in Xen through 4.12.x allowing 32-bit PV guest OS users to gain guest OS privileges by installing and using descriptors. There is missing descriptor table limit checking in x86 PV emulation. When emulating certain PV guest operations, descriptor table accesses are performed…
When was CVE-2019-18425 disclosed?
CVE-2019-18425 was first published in the National Vulnerability Database on October 31, 2019, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2019-18425 actively exploited?
CVE-2019-18425 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 83.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2019-18425?
CVE-2019-18425 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2019-18425?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2019-18425, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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