CVE-2019-20794An issue was discovered in the Linux kernel 4.18 through 5.6.11 when unprivileged user namespaces are allowed.
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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.
- CVSS
- 4.7 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- mitre
- NVD analysis
- Modified
- Record last updated
- Oct 8, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
linux linux_kernel linux:linux_kernel | from 4.18 through 5.6.11 | NVD |
References
- https://github.com/sargun/fuse-examplex-refsource-misc
- https://sourceforge.net/p/fuse/mailman/message/36598753/x-refsource-misc
- https://security.netapp.com/advisory/ntap-20200608-0001/x-refsource-confirm
- http://www.openwall.com/lists/oss-security/2020/08/24/1mailing-list, x-refsource-mlist
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.