CVE-2019-19339

Host processor halt via stale ITLB translation

Published Jan 17, 2020 · Updated Aug 5, 2024

Denial of service in Red Hat Enterprise Linux 8 kpatch allows guest OS users to halt the host processor via an instruction fetch. The incomplete live patch leaves a page-size-change window in which an instruction fetch consumes a stale ITLB translation before invalidation. Exploitation requires a privileged guest on an affected Intel virtualization host; the resulting machine-check error stops the host CPU and its guests.

CVSS severity6.5
Medium
EPSS probability0.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Red Hat Enterprise Linux 8 kpatch allows guest OS users to halt the host processor via an instruction fetch. The incomplete live patch leaves a page-size-change window in which an instruction fetch consumes a stale ITLB translation before invalidation. Exploitation requires a privileged guest on an affected Intel virtualization host; the resulting machine-check error stops the host CPU and its guests.

The record

CVE
CVE-2019-19339
Published
Jan 17, 2020
Updated
Aug 5, 2024
Vendor
Red Hat
Product
kpatch
Classifications
CWE-805, T1499.004
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Jan 17, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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  1. Affected versionversion=n/a

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

Red Hat · kpatchversion=n/a

Published CVSS scores

6.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
4.9NIST NVDAV:L/AC:L/Au:N/C:N/I:N/A:C
6.5Red Hat, Inc.CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-805Buffer Access with Incorrect Length Value
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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