CVE-2019-3900

An infinite loop issue was found in the vhost_net kernel module in Linux Kernel up to and including v5.1-rc6, while handling incoming packets in handle_rx(). It could occur if one end sends packets faster than the other end can process them. A guest user, maybe remote one, could use this flaw to stall the vhost_net kernel thread, resulting in a DoS scenario.

Published: 2019-04-25 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2019-3900 is rated Moderate Risk (62.3/100): CVSS High severity, with high exploitation likelihood (EPSS 4.42%, 90th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2019-3900

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-16 4.46% 4.42% -0.04%
2 2026-06-15 0.21% 4.46% +4.26%
3 2026-03-13 — 0.21% —

Full EPSS history (18 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2019-3900

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.7 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.1 4.0 [email protected]
6.3 3.0 MEDIUM
CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 1.8 4.0 [email protected]
6.8 2.0 MEDIUM
AV:N/AC:L/Au:S/C:N/I:N/A:C Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:S)
A single authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:C)
Complete availability impact.
 8.0 6.9 [email protected]

Weakness enumeration for CVE-2019-3900

OS Trackers for CVE-2019-3900

vendor priority summary link
debian not yet assigned CVE-2019-3900 not yet assigned priority: Debian including 1 source packages (linux), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2019-3900
redhat high — https://access.redhat.com/security/cve/CVE-2019-3900
suse low — https://www.suse.com/security/cve/CVE-2019-3900/
ubuntu medium CVE-2019-3900 medium priority: Ubuntu including 118 source packages (linux, linux-aws, …), 1187 status rows across 13 suites (bionic, cosmic, disco, eoan, focal, jammy, noble, oracular, plucky, questing, trusty, upstream, xenial): DNE 840, not-affected 164, released 161, ignored 22. https://ubuntu.com/security/CVE-2019-3900

Affected software / configurations for CVE-2019-3900

Vendor Product Version Raw CPE
linux linux_kernel >= 2.6.34, < 3.16.72 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux linux_kernel >= 3.17, < 4.4.191 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux linux_kernel >= 4.5, < 4.9.190 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux linux_kernel >= 4.10, < 4.14.133 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux linux_kernel >= 4.15, < 4.19.64 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux linux_kernel >= 4.20, < 5.2 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
fedoraproject fedora 29 cpe:2.3:o:fedoraproject:fedora:29:*:*:*:*:*:*:*
fedoraproject fedora 30 cpe:2.3:o:fedoraproject:fedora:30:*:*:*:*:*:*:*
redhat enterprise_linux 6.0 cpe:2.3:o:redhat:enterprise_linux:6.0:*:*:*:*:*:*:*
redhat enterprise_linux 7.0 cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*
debian debian_linux 8.0 cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
debian debian_linux 9.0 cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
debian debian_linux 10.0 cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
canonical ubuntu_linux 16.04 cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*
canonical ubuntu_linux 18.04 cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*
canonical ubuntu_linux 19.04 cpe:2.3:o:canonical:ubuntu_linux:19.04:*:*:*:*:*:*:*
netapp active_iq_unified_manager_for_vmware_vsphere >= 9.5 cpe:2.3:a:netapp:active_iq_unified_manager_for_vmware_vsphere:*:*:*:*:*:*:*:*
netapp hci_management_node — cpe:2.3:a:netapp:hci_management_node:-:*:*:*:*:*:*:*
netapp snapprotect — cpe:2.3:a:netapp:snapprotect:-:*:*:*:*:*:*:*
netapp solidfire — cpe:2.3:a:netapp:solidfire:-:*:*:*:*:*:*:*
netapp storage_replication_adapter_for_clustered_data_ontap_for_vmware_vsphere >= 7.2 cpe:2.3:a:netapp:storage_replication_adapter_for_clustered_data_ontap_for_vmware_vsphere:*:*:*:*:*:*:*:*
netapp vasa_provider_for_clustered_data_ontap >= 7.2 cpe:2.3:a:netapp:vasa_provider_for_clustered_data_ontap:*:*:*:*:*:*:*:*
netapp virtual_storage_console_for_vmware_vsphere >= 7.2 cpe:2.3:a:netapp:virtual_storage_console_for_vmware_vsphere:*:*:*:*:*:*:*:*
netapp cn1610_firmware — cpe:2.3:o:netapp:cn1610_firmware:-:*:*:*:*:*:*:*
oracle sd-wan_edge 8.2 cpe:2.3:a:oracle:sd-wan_edge:8.2:*:*:*:*:*:*:*
fedoraproject fedora 28 cpe:2.3:o:fedoraproject:fedora:28:*:*:*:*:*:*:*

References for CVE-2019-3900

URL Tags
http://packetstormsecurity.com/files/155212/Slackware-Security-Advisory-Slackware-14.2-kernel-Updates.html Patch Third Party Advisory VDB Entry
http://www.securityfocus.com/bid/108076 Third Party Advisory VDB Entry
https://access.redhat.com/errata/RHSA-2019:1973 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:2029 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:2043 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:3220 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:3309 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:3517 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:3836 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:3967 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:4058 Third Party Advisory
https://access.redhat.com/errata/RHSA-2020:0204 Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3900 Issue Tracking Patch Third Party Advisory
https://lists.debian.org/debian-lts-announce/2019/08/msg00016.html Mailing List Third Party Advisory
https://lists.debian.org/debian-lts-announce/2019/08/msg00017.html Mailing List Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AYTZH6QCNITK7353S6RCRT2PQHZSDPXD/ Mailing List
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RI3WXXM5URTZSR3RVEKO6MDXDFIKTZ5R/ Mailing List
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TOFNJA5NNVXQ6AV6KGZB677JIVXAMJHT/ Mailing List
https://seclists.org/bugtraq/2019/Aug/18 Mailing List Third Party Advisory
https://seclists.org/bugtraq/2019/Nov/11 Mailing List Patch Third Party Advisory
https://security.netapp.com/advisory/ntap-20190517-0005/ Third Party Advisory
https://usn.ubuntu.com/4114-1/ Third Party Advisory
https://usn.ubuntu.com/4115-1/ Third Party Advisory
https://usn.ubuntu.com/4116-1/ Third Party Advisory
https://usn.ubuntu.com/4117-1/ Third Party Advisory
https://usn.ubuntu.com/4118-1/ Third Party Advisory
https://www.debian.org/security/2019/dsa-4497 Third Party Advisory
https://www.oracle.com/security-alerts/cpuApr2021.html Third Party Advisory
https://www.spinics.net/lists/kernel/msg3111012.html Patch Third Party Advisory
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