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CVE-2021-4115

Published: 14 February 2022

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

Notes

AuthorNote
mdeslaur
Introduced by backported patch in focal+:
PolkitSystemBusName-Retrieve-both-pid-and-uid.patch

Priority

Medium

Cvss 3 Severity Score

5.5

Score breakdown

Status

Package Release Status
policykit-1
Launchpad, Ubuntu, Debian
focal
Released (0.105-26ubuntu1.3)
impish
Released (0.105-31ubuntu0.2)
bionic Not vulnerable
(code not present)
upstream Needs triage

jammy Not vulnerable
(0.105-32)
Patches:
upstream: https://github.com/freedesktop/polkit/commit/41cb093f554da8772362654a128a84dd8a5542a7

Severity score breakdown

Parameter Value
Base score 5.5
Attack vector Local
Attack complexity Low
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H