Vulnerability Details : CVE-2020-12656
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
Products affected by CVE-2020-12656
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
- cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:esm:*:*:*
- cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*
- cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:*
- cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:*
- cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:*
- cpe:2.3:o:opensuse:leap:15.2:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2020-12656
0.05%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 14 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2020-12656
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
2.1
|
LOW | AV:L/AC:L/Au:N/C:N/I:N/A:P |
3.9
|
2.9
|
NIST | |
|
5.5
|
MEDIUM | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
1.8
|
3.6
|
NIST |
CWE ids for CVE-2020-12656
-
The product does not sufficiently track and release allocated memory after it has been used, which slowly consumes remaining memory.Assigned by: nvd@nist.gov (Primary)
References for CVE-2020-12656
-
http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00022.html
[security-announce] openSUSE-SU-2020:0801-1: important: Security updateMailing List;Third Party Advisory
-
https://usn.ubuntu.com/4483-1/
USN-4483-1: Linux kernel vulnerabilities | Ubuntu security notices | UbuntuThird Party Advisory
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https://bugzilla.kernel.org/show_bug.cgi?id=206651
206651 – kmemleak in rpcsec_gss_krb5Issue Tracking;Vendor Advisory
-
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00008.html
[security-announce] openSUSE-SU-2020:0935-1: important: Security updateMailing List;Third Party Advisory
-
https://usn.ubuntu.com/4485-1/
USN-4485-1: Linux kernel vulnerabilities | Ubuntu security notices | UbuntuThird Party Advisory
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