Is CVE-2020-12656 in the CISA KEV catalog?

No. CVE-2020-12656 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2020-12656?

CVE-2020-12656 has a CVSS v3 base score of 5.5 (MEDIUM).

What is the EPSS score for CVE-2020-12656?

CVE-2020-12656 has an EPSS score of 0.33% (25th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2020-12656?

Upgrade linux on debian 11 to 5.7.6-1 or later. Fixes are available for 73 affected products.

CVE & CISA-KEV Catalog

CVE-2020-12656

MEDIUM

5.5

CVSS v3

NVD

Description

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

CWE-401Missing Release of Memory (Memory Leak)

How to fix

Remediation Available

linuxDebian

Fixed in:5.7.6-1CVE-2020-12656

linuxUbuntu

Fixed in:4.15.0-115.116USN-4485-1

Fixed in:5.4.0-45.49USN-4483-1

linux-awsUbuntu

Fixed in:4.15.0-1080.84USN-4485-1

Fixed in:5.4.0-1022.22USN-4483-1

linux-aws-5.4Ubuntu

Fixed in:5.4.0-1022.22~18.04.1USN-4483-1

linux-aws-hweUbuntu

Fixed in:4.15.0-1080.84~16.04.1USN-4485-1

linux-azureUbuntu

Fixed in:4.15.0-1093.103~14.04.1USN-4485-1

Fixed in:4.15.0-1093.103~16.04.1USN-4485-1

Fixed in:5.4.0-1023.23USN-4483-1

linux-azure-4.15Ubuntu

Fixed in:4.15.0-1093.103USN-4485-1

linux-azure-5.4Ubuntu

Fixed in:5.4.0-1023.23~18.04.1USN-4483-1

linux-gcpUbuntu

Fixed in:4.15.0-1081.92~16.04.1USN-4485-1

Fixed in:5.4.0-1022.22USN-4483-1

linux-gcp-4.15Ubuntu

Fixed in:4.15.0-1081.92USN-4485-1

linux-gcp-5.4Ubuntu

Fixed in:5.4.0-1022.22~18.04.1USN-4483-1

linux-gke-4.15Ubuntu

Fixed in:4.15.0-1067.70USN-4485-1

linux-hweUbuntu

Fixed in:4.15.0-115.116~16.04.1USN-4485-1

linux-hwe-5.4Ubuntu

Fixed in:5.4.0-45.49~18.04.2USN-4483-1

linux-image-4.15.0-1051-oracleUbuntu

Fixed in:4.15.0-1051.55~16.04.1USN-4485-1

Fixed in:4.15.0-1051.55USN-4485-1

linux-image-4.15.0-1067-gkeUbuntu

Fixed in:4.15.0-1067.70USN-4485-1

linux-image-4.15.0-1068-raspi2Ubuntu

Fixed in:4.15.0-1068.72USN-4485-1

linux-image-4.15.0-1072-kvmUbuntu

Fixed in:4.15.0-1072.73USN-4485-1

linux-image-4.15.0-1080-awsUbuntu

Fixed in:4.15.0-1080.84~16.04.1USN-4485-1

Fixed in:4.15.0-1080.84USN-4485-1

linux-image-4.15.0-1081-gcpUbuntu

Fixed in:4.15.0-1081.92~16.04.1USN-4485-1

Fixed in:4.15.0-1081.92USN-4485-1

linux-image-4.15.0-1084-snapdragonUbuntu

Fixed in:4.15.0-1084.92USN-4485-1

linux-image-4.15.0-1093-azureUbuntu

Fixed in:4.15.0-1093.103~14.04.1USN-4485-1

Fixed in:4.15.0-1093.103~16.04.1USN-4485-1

Fixed in:4.15.0-1093.103USN-4485-1

linux-image-4.15.0-1094-oemUbuntu

Fixed in:4.15.0-1094.104USN-4485-1

linux-image-4.15.0-115-genericUbuntu

Fixed in:4.15.0-115.116USN-4485-1

linux-image-4.15.0-115-generic-lpaeUbuntu

Fixed in:4.15.0-115.116USN-4485-1

linux-image-4.15.0-115-lowlatencyUbuntu

Fixed in:4.15.0-115.116USN-4485-1

linux-image-5.4.0-1016-raspiUbuntu

Fixed in:5.4.0-1016.17~18.04.1USN-4483-1

Fixed in:5.4.0-1016.17USN-4483-1

linux-image-5.4.0-1022-awsUbuntu

Fixed in:5.4.0-1022.22~18.04.1USN-4483-1

Fixed in:5.4.0-1022.22USN-4483-1

linux-image-5.4.0-1022-gcpUbuntu

Fixed in:5.4.0-1022.22~18.04.1USN-4483-1

Fixed in:5.4.0-1022.22USN-4483-1

linux-image-5.4.0-1022-oracleUbuntu

Fixed in:5.4.0-1022.22~18.04.1USN-4483-1

Fixed in:5.4.0-1022.22USN-4483-1

linux-image-5.4.0-1023-azureUbuntu

Fixed in:5.4.0-1023.23~18.04.1USN-4483-1

Fixed in:5.4.0-1023.23USN-4483-1

linux-image-5.4.0-45-genericUbuntu

Fixed in:5.4.0-45.49~18.04.2USN-4483-1

Fixed in:5.4.0-45.49USN-4483-1

linux-image-5.4.0-45-generic-lpaeUbuntu

Fixed in:5.4.0-45.49~18.04.2USN-4483-1

Fixed in:5.4.0-45.49USN-4483-1

linux-image-5.4.0-45-lowlatencyUbuntu

Fixed in:5.4.0-45.49~18.04.2USN-4483-1

Fixed in:5.4.0-45.49USN-4483-1

linux-image-awsUbuntu

Fixed in:5.4.0.1022.23USN-4483-1

linux-image-aws-edgeUbuntu

Fixed in:5.4.0.1022.8USN-4483-1

linux-image-aws-hweUbuntu

Fixed in:4.15.0.1080.77USN-4485-1

linux-image-aws-lts-18.04Ubuntu

Fixed in:4.15.0.1080.82USN-4485-1

linux-image-azureUbuntu

Fixed in:4.15.0.1093.70USN-4485-1

Fixed in:4.15.0.1093.88USN-4485-1

Fixed in:5.4.0.1023.7USN-4483-1

Fixed in:5.4.0.1023.22USN-4483-1

linux-image-azure-edgeUbuntu

Fixed in:4.15.0.1093.88USN-4485-1

linux-image-azure-lts-18.04Ubuntu

Fixed in:4.15.0.1093.67USN-4485-1

linux-image-gcpUbuntu

Fixed in:4.15.0.1081.83USN-4485-1

Fixed in:5.4.0.1022.9USN-4483-1

Fixed in:5.4.0.1022.20USN-4483-1

linux-image-gcp-lts-18.04Ubuntu

Fixed in:4.15.0.1081.99USN-4485-1

linux-image-genericUbuntu

Fixed in:4.15.0.115.103USN-4485-1

Fixed in:5.4.0.45.49USN-4483-1

linux-image-generic-hwe-18.04Ubuntu

Fixed in:5.4.0.45.49~18.04.38USN-4483-1

linux-image-generic-lpaeUbuntu

Fixed in:4.15.0.115.103USN-4485-1

Fixed in:5.4.0.45.49USN-4483-1

linux-image-generic-lpae-hwe-18.04Ubuntu

Fixed in:5.4.0.45.49~18.04.38USN-4483-1

linux-image-gkeUbuntu

Fixed in:4.15.0.1081.83USN-4485-1

Fixed in:4.15.0.1067.71USN-4485-1

Fixed in:5.4.0.1022.20USN-4483-1

linux-image-gke-4.15Ubuntu

Fixed in:4.15.0.1067.71USN-4485-1

linux-image-gke-5.4Ubuntu

Fixed in:5.4.0.1022.9USN-4483-1

linux-image-gkeop-5.4Ubuntu

Fixed in:5.4.0.45.49~18.04.38USN-4483-1

linux-image-kvmUbuntu

Fixed in:4.15.0.1072.68USN-4485-1

Fixed in:5.4.0.1021.20USN-4483-1

linux-image-lowlatencyUbuntu

Fixed in:4.15.0.115.103USN-4485-1

Fixed in:5.4.0.45.49USN-4483-1

linux-image-lowlatency-hwe-18.04Ubuntu

Fixed in:5.4.0.45.49~18.04.38USN-4483-1

linux-image-oemUbuntu

Fixed in:4.15.0.1094.98USN-4485-1

Fixed in:5.4.0.45.49USN-4483-1

linux-image-oem-osp1Ubuntu

Fixed in:5.4.0.45.49USN-4483-1

linux-image-oracleUbuntu

Fixed in:4.15.0.1051.42USN-4485-1

Fixed in:5.4.0.1022.7USN-4483-1

Fixed in:5.4.0.1022.20USN-4483-1

linux-image-oracle-lts-18.04Ubuntu

Fixed in:4.15.0.1051.62USN-4485-1

linux-image-raspiUbuntu

Fixed in:5.4.0.1016.51USN-4483-1

linux-image-raspi-hwe-18.04Ubuntu

Fixed in:5.4.0.1016.20USN-4483-1

linux-image-raspi2Ubuntu

Fixed in:4.15.0.1068.66USN-4485-1

Fixed in:5.4.0.1016.51USN-4483-1

linux-image-snapdragonUbuntu

Fixed in:4.15.0.1084.87USN-4485-1

linux-image-snapdragon-hwe-18.04Ubuntu

Fixed in:5.4.0.45.49~18.04.38USN-4483-1

linux-image-virtualUbuntu

Fixed in:4.15.0.115.103USN-4485-1

Fixed in:5.4.0.45.49USN-4483-1

linux-image-virtual-hwe-18.04Ubuntu

Fixed in:5.4.0.45.49~18.04.38USN-4483-1

linux-kvmUbuntu

Fixed in:4.15.0-1072.73USN-4485-1

Fixed in:5.4.0-1021.21USN-4483-1

linux-oemUbuntu

Fixed in:4.15.0-1094.104USN-4485-1

linux-oracleUbuntu

Fixed in:4.15.0-1051.55~16.04.1USN-4485-1

Fixed in:4.15.0-1051.55USN-4485-1

Fixed in:5.4.0-1022.22USN-4483-1

linux-oracle-5.4Ubuntu

Fixed in:5.4.0-1022.22~18.04.1USN-4483-1

linux-raspiUbuntu

Fixed in:5.4.0-1016.17USN-4483-1

linux-raspi-5.4Ubuntu

Fixed in:5.4.0-1016.17~18.04.1USN-4483-1

linux-raspi2Ubuntu

Fixed in:4.15.0-1068.72USN-4485-1

linux-snapdragonUbuntu

Fixed in:4.15.0-1084.92USN-4485-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Exploit Intelligence

0.33%probability of exploitation in 30 days

25thpercentile

Low risk: more likely to be exploited than 25% of all known CVEs.

References

Vendor Advisory1

bugzilla.kernel.org

Third-Party Advisory4

Related Vulnerabilities

Other CWE-401 (Missing Release of Memory (Memory Leak)) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2020-13934	High	7.5	64%	-	Fix
CVE-2016-6304	High	7.5	63%	-	Fix
CVE-2019-12265	Medium	5.3	55%	-	Fix
CVE-2001-0136	Medium	5.0	45%	-	-
CVE-2016-4232	High	7.5	36%	-	-
CVE-2001-0543	Medium	5.0	21%	-	-

Embed a live status badge for CVE-2020-12656

Markdown

[![CVE-2020-12656](https://tridentstack.com/cve/badge/CVE-2020-12656.svg)](https://tridentstack.com/cve/CVE-2020-12656)

HTML

<a href="https://tridentstack.com/cve/CVE-2020-12656"><img src="https://tridentstack.com/cve/badge/CVE-2020-12656.svg" alt="CVE-2020-12656"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

Start free

This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.