CVE-2020-12656

05.05.2020, 06:15

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

Provider	Type	Base Score	Atk. Vector	Atk. Complexity	Priv. Required	Vector
NIST	NIST	5.5 MEDIUM	LOCAL	LOW	LOW	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
mitre	CNA	---				---
CISA-ADP	ADP	---				---
CVE	ADP	---				---

Base Score

CVSS 3.x

EPSS Score

Percentile: 17%

Vendor	Product	Version
linux	linux_kernel	𝑥 ≤ 5.6.10
canonical	ubuntu_linux	14.04
canonical	ubuntu_linux	16.04
canonical	ubuntu_linux	18.04
canonical	ubuntu_linux	20.04
opensuse	leap	15.1
opensuse	leap	15.2

𝑥

= Vulnerable software versions

Debian Releases

Debian Product

Codename

linux

bullseye	5.10.223-1 fixed
bullseye (security)	5.10.226-1 fixed
bookworm	6.1.106-3 fixed
bookworm (security)	6.1.112-1 fixed
trixie	6.11.5-1 fixed
sid	6.11.6-1 fixed

Ubuntu Releases

Ubuntu Product

Codename

linux

groovy	not-affected
focal	Fixed 5.4.0-45.49 released
eoan	ignored
bionic	Fixed 4.15.0-115.116 released
xenial	Fixed 4.4.0-186.216 released
trusty	ignored

linux-aws

groovy	not-affected
focal	Fixed 5.4.0-1022.22 released
eoan	ignored
bionic	Fixed 4.15.0-1080.84 released
xenial	Fixed 4.4.0-1111.123 released
trusty	ignored

linux-aws-5.0

groovy	dne
focal	dne
eoan	dne
bionic	ignored
xenial	dne
trusty	dne

linux-aws-5.3

groovy	dne
focal	dne
eoan	dne
bionic	ignored
xenial	dne
trusty	dne

linux-aws-5.4

groovy	dne
focal	dne
bionic	Fixed 5.4.0-1022.22~18.04.1 released
xenial	dne
trusty	dne

linux-aws-hwe

groovy	dne
focal	dne
eoan	dne
bionic	dne
xenial	Fixed 4.15.0-1080.84~16.04.1 released
trusty	dne

linux-azure

groovy	not-affected
focal	Fixed 5.4.0-1023.23 released
eoan	ignored
bionic	ignored
xenial	Fixed 4.15.0-1093.103~16.04.1 released
trusty	Fixed 4.15.0-1093.103~14.04.1 released

linux-azure-4.15

groovy	dne
focal	dne
eoan	dne
bionic	Fixed 4.15.0-1093.103 released
xenial	dne
trusty	dne

linux-azure-5.3

groovy	dne
focal	dne
eoan	dne
bionic	ignored
xenial	dne
trusty	dne

linux-azure-5.4

groovy	dne
focal	dne
bionic	Fixed 5.4.0-1023.23~18.04.1 released
xenial	dne
trusty	dne

linux-azure-edge

groovy	dne
focal	dne
eoan	dne
bionic	ignored
xenial	dne
trusty	dne

linux-gcp

groovy	not-affected
focal	Fixed 5.4.0-1022.22 released
eoan	ignored
bionic	ignored
xenial	Fixed 4.15.0-1081.92~16.04.1 released
trusty	dne

linux-gcp-4.15

groovy	dne
focal	dne
eoan	dne
bionic	Fixed 4.15.0-1081.92 released
xenial	dne
trusty	dne

linux-gcp-5.3

groovy	dne
focal	dne
eoan	dne
bionic	ignored
xenial	dne
trusty	dne

linux-gcp-5.4

groovy	dne
focal	dne
bionic	Fixed 5.4.0-1022.22~18.04.1 released
xenial	dne
trusty	dne

linux-gcp-edge

groovy	dne
focal	dne
eoan	dne
bionic	ignored
xenial	dne
trusty	dne

linux-gke-4.15

groovy	dne
focal	dne
eoan	dne
bionic	Fixed 4.15.0-1067.70 released
xenial	dne
trusty	dne

linux-gke-5.0

groovy	dne
focal	dne
eoan	dne
bionic	Fixed 5.0.0-1045.46 released
xenial	dne
trusty	dne

linux-gke-5.3

groovy	dne
focal	dne
eoan	dne
bionic	Fixed 5.3.0-1032.34~18.04.1 released
xenial	dne
trusty	dne

linux-gke-5.4

groovy	dne
focal	dne
bionic	not-affected
xenial	dne
trusty	dne

linux-gkeop-5.4

groovy	dne
focal	dne
bionic	not-affected
xenial	dne
trusty	dne

linux-hwe

groovy	dne
focal	dne
eoan	dne
bionic	Fixed 5.3.0-64.58~18.04.1 released
xenial	Fixed 4.15.0-115.116~16.04.1 released
trusty	dne

linux-hwe-5.4

groovy	dne
focal	dne
bionic	Fixed 5.4.0-45.49~18.04.2 released
xenial	dne
trusty	dne

linux-hwe-5.8

groovy	dne
focal	not-affected
bionic	dne
xenial	dne
trusty	dne

linux-hwe-edge

groovy	dne
focal	dne
eoan	dne
bionic	ignored
xenial	ignored
trusty	dne

linux-kvm

groovy	not-affected
focal	Fixed 5.4.0-1021.21 released
eoan	ignored
bionic	Fixed 4.15.0-1072.73 released
xenial	Fixed 4.4.0-1077.84 released
trusty	dne

linux-lts-trusty

groovy	dne
focal	dne
eoan	dne
bionic	dne
xenial	dne
trusty	dne

linux-lts-xenial

groovy	dne
focal	dne
eoan	dne
bionic	dne
xenial	dne
trusty	ignored

linux-oem

groovy	dne
focal	dne
eoan	ignored
bionic	Fixed 4.15.0-1094.104 released
xenial	ignored
trusty	dne

linux-oem-5.6

groovy	dne
focal	Fixed 5.6.0-1031.32 released
eoan	dne
bionic	dne
xenial	dne
trusty	dne

linux-oem-osp1

groovy	dne
focal	dne
eoan	ignored
bionic	Fixed 5.0.0-1065.70 released
xenial	dne
trusty	dne

linux-oracle

groovy	not-affected
focal	Fixed 5.4.0-1022.22 released
eoan	ignored
bionic	Fixed 4.15.0-1051.55 released
xenial	Fixed 4.15.0-1051.55~16.04.1 released
trusty	dne

linux-oracle-5.0

groovy	dne
focal	dne
eoan	dne
bionic	ignored
xenial	dne
trusty	dne

linux-oracle-5.3

groovy	dne
focal	dne
eoan	dne
bionic	ignored
xenial	dne
trusty	dne

linux-oracle-5.4

groovy	dne
focal	dne
bionic	Fixed 5.4.0-1022.22~18.04.1 released
xenial	dne
trusty	dne

linux-raspi

groovy	not-affected
focal	Fixed 5.4.0-1016.17 released
eoan	dne
bionic	dne
xenial	dne
trusty	dne

linux-raspi-5.4

groovy	dne
focal	dne
bionic	Fixed 5.4.0-1016.17~18.04.1 released
xenial	dne
trusty	dne

linux-raspi2

groovy	dne
focal	ignored
eoan	ignored
bionic	Fixed 4.15.0-1068.72 released
xenial	Fixed 4.4.0-1136.145 released
trusty	dne

linux-raspi2-5.3

groovy	dne
focal	dne
eoan	dne
bionic	Fixed 5.3.0-1030.32~18.04.2 released
xenial	dne
trusty	dne

linux-riscv

groovy	not-affected
focal	Fixed 5.4.0-31.35 released
eoan	dne
bionic	dne
xenial	dne
trusty	dne

linux-snapdragon

groovy	dne
focal	dne
eoan	dne
bionic	Fixed 4.15.0-1084.92 released
xenial	Fixed 4.4.0-1140.148 released
trusty	dne

Common Weakness Enumeration

CWE-401 - Missing Release of Memory after Effective Lifetime
The software does not sufficiently track and release allocated memory after it has been used, which slowly consumes remaining memory.

References

http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00022.html

http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00008.html

https://bugzilla.kernel.org/show_bug.cgi?id=206651

https://usn.ubuntu.com/4483-1/

https://usn.ubuntu.com/4485-1/

http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00022.html

http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00008.html

https://bugzilla.kernel.org/show_bug.cgi?id=206651

https://usn.ubuntu.com/4483-1/

https://usn.ubuntu.com/4485-1/