Ubuntu.comUB:CVE-2020-12656CVE-2020-12656
5.5 Medium
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
2.1 Low
CVSS2
Access Vector
LOCAL
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:L/AC:L/Au:N/C:N/I:N/A:P
0.0004 Low
EPSS
Percentile
13.3%
DISPUTED gss_mech_free in net/sunrpc/auth_gss/gss_mech_switch.c in
the rpcsec_gss_krb5 implementation in the Linux kernel through 5.6.10 lacks
certain domain_release calls, leading to a memory leak. Note: This was
disputed with the assertion that the issue does not grant any access not
already available. It is a problem that on unloading a specific kernel
module some memory is leaked, but loading kernel modules is a privileged
operation. A user could also write a kernel module to consume any amount of
memory they like and load that replicating the effect of this bug.
Notes
| Author | Note |
|---|---|
| sbeattie | upstream generally treats module unload as an unsafe operation, which may explain a lack of progress in addressing the issue. |
| OS | Version | Architecture | Package | Version | Filename |
|---|---|---|---|---|---|
| ubuntu | 18.04 | noarch | linux | < 4.15.0-115.116 | UNKNOWN |
| ubuntu | 20.04 | noarch | linux | < 5.4.0-45.49 | UNKNOWN |
| ubuntu | 16.04 | noarch | linux | < 4.4.0-186.216 | UNKNOWN |
| ubuntu | 18.04 | noarch | linux-aws | < 4.15.0-1080.84 | UNKNOWN |
| ubuntu | 20.04 | noarch | linux-aws | < 5.4.0-1022.22 | UNKNOWN |
| ubuntu | 16.04 | noarch | linux-aws | < 4.4.0-1111.123 | UNKNOWN |
| ubuntu | 18.04 | noarch | linux-aws-5.4 | < 5.4.0-1022.22~18.04.1 | UNKNOWN |
| ubuntu | 16.04 | noarch | linux-aws-hwe | < 4.15.0-1080.84~16.04.1 | UNKNOWN |
| ubuntu | 20.04 | noarch | linux-azure | < 5.4.0-1023.23 | UNKNOWN |
| ubuntu | 14.04 | noarch | linux-azure | < 4.15.0-1093.103~14.04.1) Available with Ubuntu Pro or Ubuntu Pro (Infra-only | UNKNOWN |
Related
5.5 Medium
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
2.1 Low
CVSS2
Access Vector
LOCAL
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:L/AC:L/Au:N/C:N/I:N/A:P
0.0004 Low
EPSS
Percentile
13.3%