Use of insufficiently random values in Linux kernel - CVE-2020-16166

Vulnerability identifier: #VU95686

CSH Severity: Low

CVSS v4: 6.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2020-16166

CWE-ID: CWE-330

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote non-authenticated attacker to gain access to sensitive information.

The vulnerability exists due to use of insufficiently random values error within the prandom_state_selftest() function in lib/random32.c, within the update_process_times() function in kernel/time/timer.c, within the add_interrupt_randomness() function in drivers/char/random.c. A remote non-authenticated attacker can gain access to sensitive information.

Linux kernel
Anolis OS
Red Hat Enterprise Linux for IBM System z (Structure A)
Red Hat CodeReady Linux Builder for ARM 64
Red Hat CodeReady Linux Builder for Power, little endian
Red Hat CodeReady Linux Builder for x86_64
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for Real Time for NFV
Red Hat Enterprise Linux for Real Time
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Red Hat CodeReady Linux Builder for ARM 64 - Extended Update Support
Red Hat CodeReady Linux Builder for Power, little endian - Extended Update Support
Red Hat CodeReady Linux Builder for x86_64 - Extended Update Support
Red Hat Enterprise Linux for ARM 64 - Extended Update Support
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux for x86_64 - Extended Update Support
Red Hat Enterprise Linux Server - TUS
Red Hat Enterprise Linux for Real Time - Telecommunications Update Service
Red Hat Enterprise Linux Server - AUS
Slackware Linux
Ubuntu
Fedora
OpenShift Virtualization
linux-4.4.240/kernel-modules
linux-4.4.240/kernel-huge
linux-4.4.240/kernel-generic
linux-4.4.240/kernel-headers
kernel-alt (Red Hat package)
linux-image-virtual (Ubuntu package)
linux-image-generic (Ubuntu package)
linux-image-generic-lpae (Ubuntu package)
linux-image-lowlatency (Ubuntu package)
linux-image-generic-hwe-16.04 (Ubuntu package)
linux-image-virtual-hwe-16.04 (Ubuntu package)
linux-image-4.15.0-118-generic (Ubuntu package)
linux-image-lowlatency-hwe-16.04 (Ubuntu package)
linux-image-oem (Ubuntu package)
linux-image-4.15.0-118-generic-lpae (Ubuntu package)
linux-image-4.15.0-118-lowlatency (Ubuntu package)
linux-image-generic-lpae-hwe-16.04 (Ubuntu package)
linux-image-oracle (Ubuntu package)
linux-image-4.15.0-1054-oracle (Ubuntu package)
linux-image-oracle-lts-18.04 (Ubuntu package)
linux-image-4.15.0-1070-gke (Ubuntu package)
linux-image-gke-4.15 (Ubuntu package)
linux-image-gke (Ubuntu package)
linux-image-raspi2 (Ubuntu package)
linux-image-4.15.0-1071-raspi2 (Ubuntu package)
linux-image-kvm (Ubuntu package)
linux-image-4.15.0-1075-kvm (Ubuntu package)
linux-image-aws-hwe (Ubuntu package)
linux-image-aws-lts-18.04 (Ubuntu package)
linux-image-4.15.0-1083-aws (Ubuntu package)
linux-image-gcp (Ubuntu package)
linux-image-4.15.0-1084-gcp (Ubuntu package)
linux-image-gcp-lts-18.04 (Ubuntu package)
linux-image-snapdragon (Ubuntu package)
linux-image-4.15.0-1087-snapdragon (Ubuntu package)
linux-image-azure-lts-18.04 (Ubuntu package)
linux-image-azure (Ubuntu package)
linux-image-azure-edge (Ubuntu package)
linux-image-4.15.0-1096-azure (Ubuntu package)
linux-image-4.15.0-1097-oem (Ubuntu package)
kernel (Red Hat package)
kernel-rt (Red Hat package)
kernel-debug-devel
kernel-debug-modules
kernel-debug-modules-extra
kernel-devel
kernel-headers
kernel-modules
kernel-modules-extra
kernel-tools
kernel-tools-libs
kernel-tools-libs-devel
perf
python3-perf
bpftool
kernel
kernel-core
kernel-debug
kernel-debug-core
python-perf
linux-image-oem-osp1 (Ubuntu package)
linux-image-5.4.0-48-generic (Ubuntu package)
linux-image-5.4.0-48-lowlatency (Ubuntu package)
linux-image-5.4.0-48-generic-lpae (Ubuntu package)
linux-image-generic-lpae-hwe-18.04 (Ubuntu package)
linux-image-virtual-hwe-18.04 (Ubuntu package)
linux-image-generic-hwe-18.04 (Ubuntu package)
linux-image-lowlatency-hwe-18.04 (Ubuntu package)
linux-image-snapdragon-hwe-18.04 (Ubuntu package)
linux-image-5.4.0-1019-raspi (Ubuntu package)
linux-image-raspi-hwe-18.04 (Ubuntu package)
linux-image-raspi (Ubuntu package)
linux-image-5.4.0-1024-kvm (Ubuntu package)
linux-image-aws (Ubuntu package)
linux-image-5.4.0-1025-oracle (Ubuntu package)
linux-image-5.4.0-1025-gcp (Ubuntu package)
linux-image-5.4.0-1025-aws (Ubuntu package)
linux-image-5.4.0-1026-azure (Ubuntu package)

Install update from vendor's repository.

OpenShift Virtualization - update to 2.5.3
linux-4.4.240/kernel-modules - update to 4.4.240
linux-4.4.240/kernel-huge - update to 4.4.240
linux-4.4.240/kernel-generic - update to 4.4.240
linux-4.4.240/kernel-headers - update to 4.4.240_smp
kernel-alt (Red Hat package) - update to 4.14.0-115.32.1.el7a
linux-image-virtual (Ubuntu package) - addressed in versions 4.15.0.118.105, 5.4.0.48.51
linux-image-generic (Ubuntu package) - addressed in versions 4.15.0.118.105, 5.4.0.48.51
linux-image-generic-lpae (Ubuntu package) - addressed in versions 4.15.0.118.105, 5.4.0.48.51
linux-image-lowlatency (Ubuntu package) - addressed in versions 4.15.0.118.105, 5.4.0.48.51
linux-image-generic-hwe-16.04 (Ubuntu package) - update to 4.15.0.118.119
linux-image-virtual-hwe-16.04 (Ubuntu package) - update to 4.15.0.118.119
linux-image-4.15.0-118-generic (Ubuntu package) - addressed in versions 4.15.0-118.119, 4.15.0-118.119~16.04.1
linux-image-lowlatency-hwe-16.04 (Ubuntu package) - update to 4.15.0.118.119
linux-image-oem (Ubuntu package) - addressed in versions 4.15.0.118.119, 4.15.0.1097.101, 5.4.0.48.51
linux-image-4.15.0-118-generic-lpae (Ubuntu package) - addressed in versions 4.15.0-118.119, 4.15.0-118.119~16.04.1
linux-image-4.15.0-118-lowlatency (Ubuntu package) - addressed in versions 4.15.0-118.119, 4.15.0-118.119~16.04.1
linux-image-generic-lpae-hwe-16.04 (Ubuntu package) - update to 4.15.0.118.119
linux-image-oracle (Ubuntu package) - addressed in versions 4.15.0.1054.44, 5.4.0.1025.9, 5.4.0.1025.22
linux-image-4.15.0-1054-oracle (Ubuntu package) - addressed in versions 4.15.0-1054.58, 4.15.0-1054.58~16.04.1
linux-image-oracle-lts-18.04 (Ubuntu package) - update to 4.15.0.1054.64
linux-image-4.15.0-1070-gke (Ubuntu package) - update to 4.15.0-1070.73
linux-image-gke-4.15 (Ubuntu package) - update to 4.15.0.1070.74
linux-image-gke (Ubuntu package) - addressed in versions 4.15.0.1070.74, 4.15.0.1084.85, 5.4.0.1025.22
linux-image-raspi2 (Ubuntu package) - addressed in versions 4.15.0.1071.68, 5.4.0.1019.54
linux-image-4.15.0-1071-raspi2 (Ubuntu package) - update to 4.15.0-1071.75
linux-image-kvm (Ubuntu package) - addressed in versions 4.15.0.1075.71, 5.4.0.1024.22
linux-image-4.15.0-1075-kvm (Ubuntu package) - update to 4.15.0-1075.76
linux-image-aws-hwe (Ubuntu package) - update to 4.15.0.1083.79
linux-image-aws-lts-18.04 (Ubuntu package) - update to 4.15.0.1083.85
linux-image-4.15.0-1083-aws (Ubuntu package) - addressed in versions 4.15.0-1083.87, 4.15.0-1083.87~16.04.1
linux-image-gcp (Ubuntu package) - addressed in versions 4.15.0.1084.85, 5.4.0.1025.13, 5.4.0.1025.22
linux-image-4.15.0-1084-gcp (Ubuntu package) - addressed in versions 4.15.0-1084.95, 4.15.0-1084.95~16.04.1
linux-image-gcp-lts-18.04 (Ubuntu package) - update to 4.15.0.1084.102
linux-image-snapdragon (Ubuntu package) - update to 4.15.0.1087.90
linux-image-4.15.0-1087-snapdragon (Ubuntu package) - update to 4.15.0-1087.95
linux-image-azure-lts-18.04 (Ubuntu package) - update to 4.15.0.1096.69
linux-image-azure (Ubuntu package) - addressed in versions 4.15.0.1096.72, 4.15.0.1096.90, 5.4.0.1026.9, 5.4.0.1026.25
linux-image-azure-edge (Ubuntu package) - update to 4.15.0.1096.90
linux-image-4.15.0-1096-azure (Ubuntu package) - addressed in versions 4.15.0-1096.106, 4.15.0-1096.106~14.04.1, 4.15.0-1096.106~16.04.1
linux-image-4.15.0-1097-oem (Ubuntu package) - update to 4.15.0-1097.107
kernel (Red Hat package) - addressed in versions 4.18.0-147.38.1.el8_1, 4.18.0-193.37.1.el8_2, 4.18.0-240.8.1.el8_3
kernel-rt (Red Hat package) - addressed in versions 4.18.0-193.37.1.rt13.87.el8_2, 4.18.0-240.8.1.rt7.62.el8_3
kernel-debug-devel - addressed in versions 4.19.91-23.4, 4.19.91-26
kernel-debug-modules - update to 4.19.91-23.4
kernel-debug-modules-extra - update to 4.19.91-23.4
kernel-devel - addressed in versions 4.19.91-23.4, 4.19.91-26
kernel-headers - addressed in versions 4.19.91-23.4, 4.19.91-26
kernel-modules - update to 4.19.91-23.4
kernel-modules-extra - update to 4.19.91-23.4
kernel-tools - addressed in versions 4.19.91-23.4, 4.19.91-26
kernel-tools-libs - addressed in versions 4.19.91-23.4, 4.19.91-26
kernel-tools-libs-devel - addressed in versions 4.19.91-23.4, 4.19.91-26
perf - addressed in versions 4.19.91-23.4, 4.19.91-26
python3-perf - update to 4.19.91-23.4
bpftool - addressed in versions 4.19.91-23.4, 4.19.91-26
kernel - addressed in versions 4.19.91-23.4, 4.19.91-26
kernel-core - update to 4.19.91-23.4
kernel-debug - addressed in versions 4.19.91-23.4, 4.19.91-26
kernel-debug-core - update to 4.19.91-23.4
python-perf - update to 4.19.91-26
linux-image-oem-osp1 (Ubuntu package) - update to 5.4.0.48.51
linux-image-5.4.0-48-generic (Ubuntu package) - update to 5.4.0-48.52~18.04.1
linux-image-5.4.0-48-lowlatency (Ubuntu package) - update to 5.4.0-48.52~18.04.1
linux-image-5.4.0-48-generic-lpae (Ubuntu package) - update to 5.4.0-48.52~18.04.1
linux-image-generic-lpae-hwe-18.04 (Ubuntu package) - update to 5.4.0.48.52~18.04.42
linux-image-virtual-hwe-18.04 (Ubuntu package) - update to 5.4.0.48.52~18.04.42
linux-image-generic-hwe-18.04 (Ubuntu package) - update to 5.4.0.48.52~18.04.42
linux-image-lowlatency-hwe-18.04 (Ubuntu package) - update to 5.4.0.48.52~18.04.42
linux-image-snapdragon-hwe-18.04 (Ubuntu package) - update to 5.4.0.48.52~18.04.42
linux-image-5.4.0-1019-raspi (Ubuntu package) - update to 5.4.0-1019.21~18.04.1
linux-image-raspi-hwe-18.04 (Ubuntu package) - update to 5.4.0.1019.23
linux-image-raspi (Ubuntu package) - update to 5.4.0.1019.54
linux-image-5.4.0-1024-kvm (Ubuntu package) - update to 5.4.0-1024.24
linux-image-aws (Ubuntu package) - addressed in versions 5.4.0.1025.10, 5.4.0.1025.26
linux-image-5.4.0-1025-oracle (Ubuntu package) - update to 5.4.0-1025.25~18.04.1
linux-image-5.4.0-1025-gcp (Ubuntu package) - update to 5.4.0-1025.25~18.04.1
linux-image-5.4.0-1025-aws (Ubuntu package) - update to 5.4.0-1025.25~18.04.1
linux-image-5.4.0-1026-azure (Ubuntu package) - update to 5.4.0-1026.26~18.04.1
kernel - addressed in versions 5.7.14-100.fc31, 5.7.14-200.fc32, 5.7.15-100.fc31

• https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=f227e3ec3b5cad859ad15666874405e8c1bbc1d4
• https://github.com/torvalds/linux/commit/f227e3ec3b5cad859ad15666874405e8c1bbc1d4
• http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00009.html
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/MFBCLQWJI5I4G25TVJNLXLAXJ4MERQNW/
• https://security.netapp.com/advisory/ntap-20200814-0004/
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/AAPTLPAEKVAJYJ4LHN7VH4CN2W75R2YW/
• http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00047.html
• https://usn.ubuntu.com/4526-1/
• https://usn.ubuntu.com/4525-1/
• https://lists.debian.org/debian-lts-announce/2020/09/msg00025.html
• https://lists.debian.org/debian-lts-announce/2020/10/msg00034.html
• https://lists.debian.org/debian-lts-announce/2020/10/msg00032.html
• https://arxiv.org/pdf/2012.07432.pdf
• https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c51f8f88d705e06bd696d7510aff22b33eb8e638
• https://www.oracle.com/security-alerts/cpuApr2021.html

• Use of insufficiently random values in Linux kernel char driver
• Red Hat Enterprise Linux 8 update for kernel
• Multiple vulnerabilities in OpenShift Virtualization 2.5
• Anolis OS update for kernel(ANCK)4.19
• Anolis OS update for kernel(ANCK)4.19
• Ubuntu update for linux
• Ubuntu update for linux
• Slackware Linux update for kernel
• Red Hat Enterprise Linux 7 update for kernel-alt
• Red Hat Enterprise Linux 8 update for kernel-rt
• Red Hat Enterprise Linux 8 update for kernel-rt
• Red Hat Enterprise Linux 8 update for kernel
• Red Hat Enterprise Linux 8 update for kernel
• Fedora 32 update for kernel
• Fedora 31 update for kernel
• Fedora 31 update for kernel