Vulnerability Details : 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.
Products affected by CVE-2019-20794
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2019-20794
0.07%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 29 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2019-20794
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
4.7
|
MEDIUM | AV:L/AC:M/Au:N/C:N/I:N/A:C |
3.4
|
6.9
|
NIST | |
|
4.7
|
MEDIUM | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H |
1.0
|
3.6
|
NIST |
CWE ids for CVE-2019-20794
-
The product does not release a resource after its effective lifetime has ended, i.e., after the resource is no longer needed.Assigned by: nvd@nist.gov (Primary)
References for CVE-2019-20794
-
http://www.openwall.com/lists/oss-security/2020/08/24/1
oss-security - CVE-2019-20794 kernel: task processes not being properly ended could lead to resource exhaustionMailing List;Third Party Advisory
-
https://github.com/sargun/fuse-example
GitHub - sargun/fuse-example: An Example FUSE Filesystem Turned into an Exploit VectorExploit;Third Party Advisory
-
https://sourceforge.net/p/fuse/mailman/message/36598753/
Filesystem in Userspace / [fuse-devel] Kernel Hung in FUSEExploit;Third Party Advisory
-
https://security.netapp.com/advisory/ntap-20200608-0001/
May 2020 Linux Kernel Vulnerabilities in NetApp Products | NetApp Product SecurityThird Party Advisory
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