Bug 1849005 (CVE-2019-20794) - CVE-2019-20794 kernel: task processes not being properly ended could lead to resource exhaustion
Summary: CVE-2019-20794 kernel: task processes not being properly ended could lead to ...
Keywords:
Status: NEW
Alias: CVE-2019-20794
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1849006 1867711 1867712 1867713 1867714 1867715 1911196
Blocks: 1849008
TreeView+ depends on / blocked
 
Reported: 2020-06-19 13:09 UTC by Marian Rehak
Modified: 2022-12-31 23:35 UTC (History)
44 users (show)

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A flaw was found in the Linux kernel. A user with PID namespace mounting a FUSE filesystem could cause a denial of service if the userspace component is terminated (pid 1). The highest threat from this vulnerability is to system availability.
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Description Marian Rehak 2020-06-19 13:09:23 UTC 
A flaw was found when a user with PID namespace mounting a FUSE filesystem, If the userspace component is terminated (pid 1), this results into a denial of service (DoS) problem. This internally makes the fuse requests go into Uninterruptiblein state until the system is rebooted.

Reference:

https://github.com/sargun/fuse-example
Comment 1 Marian Rehak 2020-06-19 13:10:12 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1849006]
Comment 8 Alexey Gladkov 2020-10-07 10:02:28 UTC 
Possible fix: https://lore.kernel.org/lkml/0c3dde5aaaaba58125e026a93749ecae4fdf2316.1601562271.git.gladkov.alexey@gmail.com/
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