4.7 Medium
CVSS2
Attack Vector
LOCAL
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
COMPLETE
AV:L/AC:M/Au:N/C:N/I:N/A:C
4.7 Medium
CVSS3
Attack Vector
LOCAL
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
0.0004 Low
EPSS
Percentile
5.1%
A race condition accessing file object in the Linux kernel OverlayFS
subsystem was found in the way users do rename in specific way with
OverlayFS. A local user could use this flaw to crash the system.
OS | Version | Architecture | Package | Version | Filename |
---|---|---|---|---|---|
ubuntu | 18.04 | noarch | linux | < 4.15.0-166.174 | UNKNOWN |
ubuntu | 20.04 | noarch | linux | < 5.4.0-92.103 | UNKNOWN |
ubuntu | 21.04 | noarch | linux | < 5.11.0-44.48 | UNKNOWN |
ubuntu | 21.10 | noarch | linux | < 5.13.0-23.23 | UNKNOWN |
ubuntu | 16.04 | noarch | linux | < 4.4.0-242.276 | UNKNOWN |
ubuntu | 18.04 | noarch | linux-aws | < 4.15.0-1118.125 | UNKNOWN |
ubuntu | 20.04 | noarch | linux-aws | < 5.4.0-1061.64 | UNKNOWN |
ubuntu | 21.04 | noarch | linux-aws | < 5.11.0-1023.24 | UNKNOWN |
ubuntu | 21.10 | noarch | linux-aws | < 5.13.0-1008.9 | UNKNOWN |
ubuntu | 14.04 | noarch | linux-aws | < 4.4.0-1120.126 | UNKNOWN |
git.kernel.org/linus/a295aef603e109a47af355477326bd41151765b6 (5.15-rc5)
launchpad.net/bugs/cve/CVE-2021-20321
nvd.nist.gov/vuln/detail/CVE-2021-20321
security-tracker.debian.org/tracker/CVE-2021-20321
ubuntu.com/security/notices/USN-5208-1
ubuntu.com/security/notices/USN-5209-1
ubuntu.com/security/notices/USN-5210-1
ubuntu.com/security/notices/USN-5218-1
ubuntu.com/security/notices/USN-6221-1
www.cve.org/CVERecord?id=CVE-2021-20321
4.7 Medium
CVSS2
Attack Vector
LOCAL
Attack Complexity
MEDIUM
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
COMPLETE
AV:L/AC:M/Au:N/C:N/I:N/A:C
4.7 Medium
CVSS3
Attack Vector
LOCAL
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
0.0004 Low
EPSS
Percentile
5.1%