Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 4.18, <= 5.6.11 |
Related Weaknesses (CWE)
References
- http://www.openwall.com/lists/oss-security/2020/08/24/1Mailing ListThird Party Advisory
- https://github.com/sargun/fuse-exampleExploitThird Party Advisory
- https://security.netapp.com/advisory/ntap-20200608-0001/Third Party Advisory
- https://sourceforge.net/p/fuse/mailman/message/36598753/ExploitThird Party Advisory
- http://www.openwall.com/lists/oss-security/2020/08/24/1Mailing ListThird Party Advisory
- https://github.com/sargun/fuse-exampleExploitThird Party Advisory
- https://security.netapp.com/advisory/ntap-20200608-0001/Third Party Advisory
- https://sourceforge.net/p/fuse/mailman/message/36598753/ExploitThird Party Advisory
FAQ
What is CVE-2019-20794?
CVE-2019-20794 is a vulnerability with a CVSS score of 4.7 (MEDIUM). 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 ...
How severe is CVE-2019-20794?
CVE-2019-20794 has been rated MEDIUM with a CVSS base score of 4.7/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2019-20794?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.