Vulnerability in Linux Kernel
CVE-2019-20794
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.7 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.005 (42.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 43rd percentile — 42.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/sargun/fuse-example (Exploit, Third Party Advisory)
- sourceforge.net/p/fuse/mailman/message/36598753/ (Exploit, Third Party Advisory)
- security.netapp.com/advisory/ntap-20200608-0001/ (Third Party Advisory)
- www.openwall.com/lists/oss-security/2020/08/24/1 (mailing-list, Mailing List, Third Party Advisory)
Frequently asked questions
- What is CVE-2019-20794?
- CVE-2019-20794 is a medium-severity vulnerability in Linux Kernel, classified under Missing Release of Resource after Effective Lifetime. CVSS score: 4.7/10. Published 2020-05-09.
- How severe is CVE-2019-20794?
- Medium severity. CVSS v3 base score is 4.7 out of 10.
- Is CVE-2019-20794 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.