CVE-2019-20794

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Summary

CVECVE-2019-20794
StatePUBLISHED
Assignermitre
Source PriorityCVE Program / NVD first with legacy fallback
Published2020-05-09 18:15:11 UTC
Updated2026-10-08 21:17:19 UTC
DescriptionAn issue was discovered in the Linux kernel 4.18 through 5.6.11 when unprivileged user namespaces are allowed. A user can create their own PID namespace, and mount a FUSE filesystem. Upon interaction with this FUSE filesystem, if the userspace component is terminated via a kill of the PID namespace's pid 1, it will result in a hung task, and resources being permanently locked up until system reboot. This can result in resource exhaustion.

Risk And Classification

Primary CVSS: v3.1 4.7 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS: 0.005120000 probability, percentile 0.418840000 (date 2026-10-10)

Problem Types: CWE-772 | n/a

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary4.7MEDIUMCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
2.0[email protected]Primary4.7AV:L/AC:M/Au:N/C:N/I:N/A:C

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS v2.0 Breakdown

Access Vector
Local
Access Complexity
Medium
Authentication
None
Confidentiality
None
Integrity
None
Availability
Complete

AV:L/AC:M/Au:N/C:N/I:N/A:C

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Na N/a affected n/a Not specified

References

ReferenceSourceLinkTags
GitHub - sargun/fuse-example: An Example FUSE Filesystem Turned into an Exploit Vector af854a3a-2127-422b-91ae-364da2661108 github.com Exploit, Third Party Advisory
oss-security - CVE-2019-20794 kernel: task processes not being properly ended could lead to resource exhaustion af854a3a-2127-422b-91ae-364da2661108 www.openwall.com Mailing List, Third Party Advisory
May 2020 Linux Kernel Vulnerabilities in NetApp Products | NetApp Product Security af854a3a-2127-422b-91ae-364da2661108 security.netapp.com Third Party Advisory
Filesystem in Userspace / [fuse-devel] Kernel Hung in FUSE af854a3a-2127-422b-91ae-364da2661108 sourceforge.net Exploit, Third Party Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Legacy QID Mappings

  • 900076 CBL-Mariner Linux Security Update for kernel 5.4.91
  • 903282 Common Base Linux Mariner (CBL-Mariner) Security Update for kernel (3502)
  • 905792 Common Base Linux Mariner (CBL-Mariner) Security Update for kernel (3502-1)

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