Disclosure summary
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.
Source-reported weakness categories
CWE-772
Source-specific records & product guidance
Sources retain their own attribution and scoring. Follow the original record to confirm affected versions, fixed releases, and configuration conditions.
NIST National Vulnerability Database · NVD-CVE-2019-20794
Open original source · Updated Oct 08, 2026
Only CPE matches marked vulnerable=true are indexed. AND/OR platform conditions must be checked in the original NVD record.
| Vendor | Product / association | Version / bounds |
|---|---|---|
| linux | linux_kernel | * {"versionStartIncluding":"4.18","versionEndIncluding":"5.6.11"} |
Original records & references
- NIST NVD record
- CVE Program record
- github.com — Exploit, Third Party Advisory
- security.netapp.com — Third Party Advisory
- sourceforge.net — Exploit, Third Party Advisory
- github.com — Exploit, Third Party Advisory
- security.netapp.com — Third Party Advisory
- sourceforge.net — Exploit, Third Party Advisory
PUBLISHED 2020-05-09T14:15:11-04:00
MODIFIED 2026-10-08T17:17:19-04:00
INGESTED 2026-10-10T20:50:19-04:00