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.
References
Link | Resource |
---|---|
http://www.openwall.com/lists/oss-security/2020/08/24/1 | Mailing List Third Party Advisory |
https://github.com/sargun/fuse-example | Exploit Third Party Advisory |
https://security.netapp.com/advisory/ntap-20200608-0001/ | Third Party Advisory |
https://sourceforge.net/p/fuse/mailman/message/36598753/ | Exploit Third Party Advisory |
History
No history.
MITRE Information
Status: PUBLISHED
Assigner: mitre
Published: 2020-05-09T17:35:50
Updated: 2020-08-24T11:06:07
Reserved: 2020-05-09T00:00:00
Link: CVE-2019-20794
JSON object: View
NVD Information
Status : Analyzed
Published: 2020-05-09T18:15:11.157
Modified: 2021-07-21T11:39:23.747
Link: CVE-2019-20794
JSON object: View
Redhat Information
No data.
CWE