Medium severity · published Feb 21, 2022
CVE-2021-4115
There is a flaw in polkit which can allow an unprivileged user to cause polkit to crash, due to process file descriptor exhaustion
5.5
CVSS
0.5%
EPSS
No
On KEV
Description
There is a flaw in polkit which can allow an unprivileged user to cause polkit to crash, due to process file descriptor exhaustion. The highest threat from this vulnerability is to availability. NOTE: Polkit process outage duration is tied to the failing process being reaped and a new one being spawned
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 44% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
DL
Debian Linux · Debian
11.0 · source: NVD
EL
Enterprise Linux · Redhat
8.0 · source: NVD
FE
Fedora · Fedoraproject
34; 35 · source: NVD
PO
Polkit · Polkit Project
0.117 · source: NVD
UL
Ubuntu Linux · Canonical
20.04; 21.10 · source: NVD
ZS
Zfs Storage Appliance Kit · Oracle
8.8 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-4115
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-4115
packetstormsecurity.com
http://packetstormsecurity.com/files/172849/polkit-File-Descriptor-Exhaustion.html
Third Party Advisory
https://access.redhat.com/security/cve/cve-2021-4115
Patch
https://gitlab.com/redhat/centos-stream/rpms/polkit/-/merge_requests/6/diffs?commit_id=bf900df04dc390d389e59aa10942b0f2b15c531e
Exploit
https://gitlab.freedesktop.org/polkit/polkit/-/issues/141
lists.fedoraproject.org
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VGKWCBS6IDZYYDYM2WIWJM5BL7QQTWPF/
Patch
https://www.oracle.com/security-alerts/cpujul2022.html
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