CVE-2019-20794: n/a vulnerability

CVE-2019-20794: An issue was discovered in the Linux kernel 4.18 through 5.6.11 when unprivileged user namespaces are allowed.

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.

UnknownCVSS not scoredNot KEV-listedUpdatedAug 5, 2024, 02:53 UTC (UTC+00:00)

Security readout for executives and security teams

CVE-2019-20794 is a Linux kernel denial-of-service issue. On kernels 4.18 through 5.6.11, if unprivileged user namespaces are allowed, a local user may trigger hung tasks through FUSE and PID namespace behavior, locking resources until reboot. Exposure is most likely on Linux systems running kernel 4.18 through 5.6.11 where unprivileged user namespaces and FUSE mounting are enabled or available to local users. Prioritize shared Linux hosts, multi-tenant systems, developer workstations, and container-capable servers. This is mainly an availability risk, but affected systems may require reboot to recover locked resources. Mitigation focus: Check Linux distribution or vendor advisories for kernel-specific fixes.; Update affected kernels according to trusted vendor guidance.; Restrict unprivileged user namespaces where not operationally required..

Prepared: Jun 5, 2026, 14:59 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: May 9, 2020, 17:35 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

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4Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

CVE List V5 sourceCVE List V5
https://github.com/sargun/fuse-exampleCVE reference · x_refsource_MISC
https://sourceforge.net/p/fuse/mailman/message/36598753/CVE reference · x_refsource_MISC
https://security.netapp.com/advisory/ntap-20200608-0001/CVE reference · x_refsource_CONFIRM

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

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Weakness

CWE details

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