CVE-2021-3982
Published: 29 April 2022
Linux distributions using CAP_SYS_NICE for gnome-shell may be exposed to a privilege escalation issue. An attacker, with low privilege permissions, may take advantage of the way CAP_SYS_NICE is currently implemented and eventually load code to increase its process scheduler priority leading to possible DoS of other services running in the same machine.
Notes
| Author | Note |
|---|---|
| mdeslaur | Red Hat's gnome-shell packaging was setting CAP_SYS_NICE on the gnome-shell binary. Ubuntu packaging does not do that, so is not vulnerable to this issue. |
Priority
Status
| Package | Release | Status |
|---|---|---|
|
gnome-shell Launchpad, Ubuntu, Debian |
bionic |
Not vulnerable
(3.28.4-0ubuntu18.04.7)
|
| focal |
Not vulnerable
(3.36.9-0ubuntu0.20.04.2)
|
|
| hirsute |
Not vulnerable
(3.38.4-1ubuntu3~21.04.1)
|
|
| impish |
Not vulnerable
(40.5-1ubuntu2)
|
|
| jammy |
Not vulnerable
(40.5-1ubuntu2)
|
|
| kinetic |
Not vulnerable
(40.5-1ubuntu2)
|
|
| lunar |
Not vulnerable
(40.5-1ubuntu2)
|
|
| mantic |
Not vulnerable
(40.5-1ubuntu2)
|
|
| trusty |
Ignored
(end of standard support)
|
|
| upstream |
Needs triage
|
|
| xenial |
Needed
|
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 |