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VULNERABILITIES

CVE-2019-20794 Details

Description

An 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.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:4.7 MEDIUMVector:CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://github.com/sargun/fuse-example CVEExploitThird Party Advisory
https://security.netapp.com/advisory/ntap-20200608-0001/ CVEThird Party Advisory
https://sourceforge.net/p/fuse/mailman/message/36598753/ CVEExploitThird Party Advisory
http://www.openwall.com/lists/oss-security/2020/08/24/1 CVEMailing ListThird Party Advisory
https://github.com/sargun/fuse-example [email protected]ExploitThird Party Advisory

see all 8 references

Weakness Enumeration

CWE-IDCWE NameSource
CWE-772Missing Release of Resource after Effective Lifetime[email protected]

Affected Products

ProductVersions
linux linux kernel
>= 4.18, <= 5.6.11

CPE

  • cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

Remediation

  • No remediation found in references.

Change History

8 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2019-20794
NVD Published Date:
May 9, 2020
NVD Last Modified:
Jun 17, 2026
Source:
[email protected]
CVE-2019-20794 Details - Not Deferred