Ubuntu.comUB:CVE-2021-3847CVE-2021-3847
7.2 High
CVSS2
Attack Vector
LOCAL
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:L/AC:L/Au:N/C:C/I:C/A:C
7.8 High
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
0.0004 Low
EPSS
Percentile
5.1%
An unauthorized access to the execution of the setuid file with
capabilities flaw in the Linux kernel OverlayFS subsystem was found in the
way user copying a capable file from a nosuid mount into another mount. A
local user could use this flaw to escalate their privileges on the system.
Bugs
- <https://bugzilla.redhat.com/show_bug.cgi?id=2009704>
- <https://bugzilla.suse.com/show_bug.cgi?id=1191694>
Notes
| Author | Note |
|---|---|
| sbeattie | Miklos, a primary maintainer for overlayfs, asserts in the SUSE bug that this is a misunderstanding of how overlayfs operates. |
Related
7.2 High
CVSS2
Attack Vector
LOCAL
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:L/AC:L/Au:N/C:C/I:C/A:C
7.8 High
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
0.0004 Low
EPSS
Percentile
5.1%