Information disclosure in Linux kernel - CVE-2021-4135

Vulnerability identifier: #VU63566

CSH Severity: Low

CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2021-4135

CWE-ID: CWE-200

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to gain access to potentially sensitive information.

The vulnerability exists due to simulated networking device driver for the Linux kernel does not properly initialize memory in certain situations. A local user can gain unauthorized access to sensitive information (kernel memory).

Linux kernel
Debian Linux
SUSE Linux Enterprise Micro
Anolis OS
SUSE Linux Enterprise Module for Realtime
SUSE Linux Enterprise Module for Public Cloud
Ubuntu
kernel-debug-core
kernel-debug-devel
kernel-debug-modules
kernel-debug-modules-extra
kernel-devel
kernel-headers
kernel-modules
kernel-modules-extra
kernel-modules-internal
kernel-tools
kernel-tools-libs
kernel-tools-libs-devel
perf
kernel-debug
kernel-core
kernel
python3-perf
bpftool
linux (Debian package)
ocfs2-kmp-rt
ocfs2-kmp-rt-debuginfo
kernel-devel-rt
kernel-source-rt
gfs2-kmp-rt
kernel-syms-rt
kernel-rt_debug-devel-debuginfo
kernel-rt_debug-devel
kernel-rt_debug-debugsource
kernel-rt_debug-debuginfo
kernel-rt_debug
kernel-rt-devel
cluster-md-kmp-rt
cluster-md-kmp-rt-debuginfo
dlm-kmp-rt
dlm-kmp-rt-debuginfo
gfs2-kmp-rt-debuginfo
kernel-rt
kernel-rt-debuginfo
kernel-rt-debugsource
kernel-rt-devel-debuginfo
kernel-devel-azure
kernel-source-azure
kernel-azure
kernel-azure-debuginfo
kernel-azure-debugsource
kernel-azure-devel
kernel-azure-devel-debuginfo
kernel-syms-azure
linux-image-oem (Ubuntu package)
linux-image-oem-osp1 (Ubuntu package)
linux-image-generic (Ubuntu package)
linux-image-virtual (Ubuntu package)
linux-image-generic-lpae (Ubuntu package)
linux-image-lowlatency (Ubuntu package)
linux-image-5.4.0-105-generic-lpae (Ubuntu package)
linux-image-5.4.0-105-generic (Ubuntu package)
linux-image-5.4.0-105-lowlatency (Ubuntu package)
linux-image-lowlatency-hwe-18.04 (Ubuntu package)
linux-image-virtual-hwe-18.04 (Ubuntu package)
linux-image-snapdragon-hwe-18.04 (Ubuntu package)
linux-image-generic-hwe-18.04 (Ubuntu package)
linux-image-generic-lpae-hwe-18.04 (Ubuntu package)
linux-image-ibm (Ubuntu package)
linux-image-ibm-lts-20.04 (Ubuntu package)
linux-image-5.4.0-1018-ibm (Ubuntu package)
linux-image-bluefield (Ubuntu package)
linux-image-5.4.0-1032-bluefield (Ubuntu package)
linux-image-5.4.0-1037-gkeop (Ubuntu package)
linux-image-gkeop-5.4 (Ubuntu package)
linux-image-gkeop (Ubuntu package)
linux-image-raspi-hwe-18.04 (Ubuntu package)
linux-image-5.4.0-1056-raspi (Ubuntu package)
linux-image-raspi (Ubuntu package)
linux-image-raspi2 (Ubuntu package)
linux-image-kvm (Ubuntu package)
linux-image-5.4.0-1059-kvm (Ubuntu package)
linux-image-5.4.0-1066-gke (Ubuntu package)
linux-image-gke-5.4 (Ubuntu package)
linux-image-gke (Ubuntu package)
linux-image-oracle-lts-20.04 (Ubuntu package)
linux-image-5.4.0-1067-oracle (Ubuntu package)
linux-image-oracle (Ubuntu package)
linux-image-gcp (Ubuntu package)
linux-image-5.4.0-1068-gcp (Ubuntu package)
linux-image-gcp-lts-20.04 (Ubuntu package)
linux-image-aws (Ubuntu package)
linux-image-aws-lts-20.04 (Ubuntu package)
linux-image-5.4.0-1069-aws (Ubuntu package)
linux-image-azure (Ubuntu package)
linux-image-azure-lts-20.04 (Ubuntu package)
linux-image-5.4.0-1073-azure (Ubuntu package)
linux-image-5.13.0-37-generic (Ubuntu package)
linux-image-5.13.0-37-lowlatency (Ubuntu package)
linux-image-5.13.0-37-generic-64k (Ubuntu package)
linux-image-5.13.0-37-generic-lpae (Ubuntu package)
linux-image-generic-64k-hwe-20.04 (Ubuntu package)
linux-image-generic-hwe-20.04 (Ubuntu package)
linux-image-lowlatency-hwe-20.04 (Ubuntu package)
linux-image-virtual-hwe-20.04 (Ubuntu package)
linux-image-generic-lpae-hwe-20.04 (Ubuntu package)
linux-image-oem-20.04 (Ubuntu package)
linux-image-generic-64k (Ubuntu package)
linux-image-5.13.0-1018-kvm (Ubuntu package)
linux-image-5.13.0-1019-aws (Ubuntu package)
linux-image-5.13.0-1021-azure (Ubuntu package)
linux-image-5.13.0-1021-gcp (Ubuntu package)
linux-image-5.13.0-1022-raspi-nolpae (Ubuntu package)
linux-image-5.13.0-1022-raspi (Ubuntu package)
linux-image-raspi-nolpae (Ubuntu package)
linux-image-5.13.0-1023-oracle (Ubuntu package)
linux-image-5.13.0-1025-oracle (Ubuntu package)
linux-image-oem-20.04d (Ubuntu package)
linux-image-5.14.0-1022-oem (Ubuntu package)

Install updates from vendor's website.

kernel-debug-core - update to 4.19.91-25.8
kernel-debug-devel - update to 4.19.91-25.8
kernel-debug-modules - update to 4.19.91-25.8
kernel-debug-modules-extra - update to 4.19.91-25.8
kernel-devel - update to 4.19.91-25.8
kernel-headers - update to 4.19.91-25.8
kernel-modules - update to 4.19.91-25.8
kernel-modules-extra - update to 4.19.91-25.8
kernel-modules-internal - update to 4.19.91-25.8
kernel-tools - update to 4.19.91-25.8
kernel-tools-libs - update to 4.19.91-25.8
kernel-tools-libs-devel - update to 4.19.91-25.8
perf - update to 4.19.91-25.8
kernel-debug - update to 4.19.91-25.8
kernel-core - update to 4.19.91-25.8
kernel - update to 4.19.91-25.8
python3-perf - update to 4.19.91-25.8
bpftool - update to 4.19.91-25.8
linux (Debian package) - update to 4.19.232-1
ocfs2-kmp-rt - addressed in versions 5.3.18-68.1, 5.3.18-150300.71.1
ocfs2-kmp-rt-debuginfo - addressed in versions 5.3.18-68.1, 5.3.18-150300.71.1
kernel-devel-rt - addressed in versions 5.3.18-68.1, 5.3.18-150300.71.1
kernel-source-rt - addressed in versions 5.3.18-68.1, 5.3.18-150300.71.1
gfs2-kmp-rt - addressed in versions 5.3.18-68.1, 5.3.18-150300.71.1
kernel-syms-rt - addressed in versions 5.3.18-68.1, 5.3.18-150300.71.1
kernel-rt_debug-devel-debuginfo - addressed in versions 5.3.18-68.1, 5.3.18-150300.71.1
kernel-rt_debug-devel - addressed in versions 5.3.18-68.1, 5.3.18-150300.71.1
kernel-rt_debug-debugsource - addressed in versions 5.3.18-68.1, 5.3.18-150300.71.1
kernel-rt_debug-debuginfo - addressed in versions 5.3.18-68.1, 5.3.18-150300.71.1
kernel-rt_debug - update to 5.3.18-68.1
kernel-rt-devel - addressed in versions 5.3.18-68.1, 5.3.18-150300.71.1
cluster-md-kmp-rt - addressed in versions 5.3.18-68.1, 5.3.18-150300.71.1
cluster-md-kmp-rt-debuginfo - addressed in versions 5.3.18-68.1, 5.3.18-150300.71.1
dlm-kmp-rt - addressed in versions 5.3.18-68.1, 5.3.18-150300.71.1
dlm-kmp-rt-debuginfo - addressed in versions 5.3.18-68.1, 5.3.18-150300.71.1
gfs2-kmp-rt-debuginfo - addressed in versions 5.3.18-68.1, 5.3.18-150300.71.1
kernel-rt - addressed in versions 5.3.18-68.1, 5.3.18-150300.71.1
kernel-rt-debuginfo - addressed in versions 5.3.18-68.1, 5.3.18-150300.71.1
kernel-rt-debugsource - addressed in versions 5.3.18-68.1, 5.3.18-150300.71.1
kernel-rt-devel-debuginfo - addressed in versions 5.3.18-68.1, 5.3.18-150300.71.1
kernel-devel-azure - update to 5.3.18-150300.38.37.1
kernel-source-azure - update to 5.3.18-150300.38.37.1
kernel-azure - update to 5.3.18-150300.38.37.1
kernel-azure-debuginfo - update to 5.3.18-150300.38.37.1
kernel-azure-debugsource - update to 5.3.18-150300.38.37.1
kernel-azure-devel - update to 5.3.18-150300.38.37.1
kernel-azure-devel-debuginfo - update to 5.3.18-150300.38.37.1
kernel-syms-azure - update to 5.3.18-150300.38.37.1
linux-image-oem (Ubuntu package) - addressed in versions 5.4.0.105.109, 5.4.0.105.119~18.04.90
linux-image-oem-osp1 (Ubuntu package) - addressed in versions 5.4.0.105.109, 5.4.0.105.119~18.04.90
linux-image-generic (Ubuntu package) - addressed in versions 5.4.0.105.109, 5.13.0.37.46
linux-image-virtual (Ubuntu package) - addressed in versions 5.4.0.105.109, 5.13.0.37.46
linux-image-generic-lpae (Ubuntu package) - addressed in versions 5.4.0.105.109, 5.13.0.37.46
linux-image-lowlatency (Ubuntu package) - addressed in versions 5.4.0.105.109, 5.13.0.37.46
linux-image-5.4.0-105-generic-lpae (Ubuntu package) - addressed in versions 5.4.0-105.119, 5.4.0-105.119~18.04.1
linux-image-5.4.0-105-generic (Ubuntu package) - addressed in versions 5.4.0-105.119, 5.4.0-105.119~18.04.1
linux-image-5.4.0-105-lowlatency (Ubuntu package) - addressed in versions 5.4.0-105.119, 5.4.0-105.119~18.04.1
linux-image-lowlatency-hwe-18.04 (Ubuntu package) - update to 5.4.0.105.119~18.04.90
linux-image-virtual-hwe-18.04 (Ubuntu package) - update to 5.4.0.105.119~18.04.90
linux-image-snapdragon-hwe-18.04 (Ubuntu package) - update to 5.4.0.105.119~18.04.90
linux-image-generic-hwe-18.04 (Ubuntu package) - update to 5.4.0.105.119~18.04.90
linux-image-generic-lpae-hwe-18.04 (Ubuntu package) - update to 5.4.0.105.119~18.04.90
linux-image-ibm (Ubuntu package) - addressed in versions 5.4.0.1018.18, 5.4.0.1018.35
linux-image-ibm-lts-20.04 (Ubuntu package) - update to 5.4.0.1018.18
linux-image-5.4.0-1018-ibm (Ubuntu package) - addressed in versions 5.4.0-1018.20, 5.4.0-1018.20~18.04.1
linux-image-bluefield (Ubuntu package) - update to 5.4.0.1032.33
linux-image-5.4.0-1032-bluefield (Ubuntu package) - update to 5.4.0-1032.35
linux-image-5.4.0-1037-gkeop (Ubuntu package) - addressed in versions 5.4.0-1037.38, 5.4.0-1037.38~18.04.1
linux-image-gkeop-5.4 (Ubuntu package) - addressed in versions 5.4.0.1037.38~18.04.37, 5.4.0.1037.40
linux-image-gkeop (Ubuntu package) - update to 5.4.0.1037.40
linux-image-raspi-hwe-18.04 (Ubuntu package) - update to 5.4.0.1056.58
linux-image-5.4.0-1056-raspi (Ubuntu package) - addressed in versions 5.4.0-1056.63, 5.4.0-1056.63~18.04.1
linux-image-raspi (Ubuntu package) - addressed in versions 5.4.0.1056.90, 5.13.0.1022.27
linux-image-raspi2 (Ubuntu package) - update to 5.4.0.1056.90
linux-image-kvm (Ubuntu package) - addressed in versions 5.4.0.1059.58, 5.13.0.1018.18
linux-image-5.4.0-1059-kvm (Ubuntu package) - update to 5.4.0-1059.62
linux-image-5.4.0-1066-gke (Ubuntu package) - addressed in versions 5.4.0-1066.69, 5.4.0-1066.69~18.04.1
linux-image-gke-5.4 (Ubuntu package) - addressed in versions 5.4.0.1066.69~18.04.30, 5.4.0.1066.76
linux-image-gke (Ubuntu package) - addressed in versions 5.4.0.1066.76, 5.13.0.1021.19
linux-image-oracle-lts-20.04 (Ubuntu package) - update to 5.4.0.1067.67
linux-image-5.4.0-1067-oracle (Ubuntu package) - addressed in versions 5.4.0-1067.72, 5.4.0-1067.72~18.04.1
linux-image-oracle (Ubuntu package) - addressed in versions 5.4.0.1067.72~18.04.46, 5.13.0.1023.23, 5.13.0.1025.30~20.04.1
linux-image-gcp (Ubuntu package) - addressed in versions 5.4.0.1068.53, 5.13.0.1021.19, 5.13.0.1021.25~20.04.1
linux-image-5.4.0-1068-gcp (Ubuntu package) - addressed in versions 5.4.0-1068.72, 5.4.0-1068.72~18.04.1
linux-image-gcp-lts-20.04 (Ubuntu package) - update to 5.4.0.1068.77
linux-image-aws (Ubuntu package) - addressed in versions 5.4.0.1069.51, 5.13.0.1019.20, 5.13.0.1019.21~20.04.12
linux-image-aws-lts-20.04 (Ubuntu package) - update to 5.4.0.1069.71
linux-image-5.4.0-1069-aws (Ubuntu package) - addressed in versions 5.4.0-1069.73, 5.4.0-1069.73~18.04.1
linux-image-azure (Ubuntu package) - addressed in versions 5.4.0.1073.52, 5.13.0.1021.24~20.04.10
linux-image-azure-lts-20.04 (Ubuntu package) - update to 5.4.0.1073.71
linux-image-5.4.0-1073-azure (Ubuntu package) - addressed in versions 5.4.0-1073.76, 5.4.0-1073.76~18.04.1
linux-image-5.13.0-37-generic (Ubuntu package) - addressed in versions 5.13.0-37.42, 5.13.0-37.42~20.04.1
linux-image-5.13.0-37-lowlatency (Ubuntu package) - addressed in versions 5.13.0-37.42, 5.13.0-37.42~20.04.1
linux-image-5.13.0-37-generic-64k (Ubuntu package) - addressed in versions 5.13.0-37.42, 5.13.0-37.42~20.04.1
linux-image-5.13.0-37-generic-lpae (Ubuntu package) - addressed in versions 5.13.0-37.42, 5.13.0-37.42~20.04.1
linux-image-generic-64k-hwe-20.04 (Ubuntu package) - update to 5.13.0.37.42~20.04.22
linux-image-generic-hwe-20.04 (Ubuntu package) - update to 5.13.0.37.42~20.04.22
linux-image-lowlatency-hwe-20.04 (Ubuntu package) - update to 5.13.0.37.42~20.04.22
linux-image-virtual-hwe-20.04 (Ubuntu package) - update to 5.13.0.37.42~20.04.22
linux-image-generic-lpae-hwe-20.04 (Ubuntu package) - update to 5.13.0.37.42~20.04.22
linux-image-oem-20.04 (Ubuntu package) - update to 5.13.0.37.46
linux-image-generic-64k (Ubuntu package) - update to 5.13.0.37.46
linux-image-5.13.0-1018-kvm (Ubuntu package) - update to 5.13.0-1018.19
linux-image-5.13.0-1019-aws (Ubuntu package) - addressed in versions 5.13.0-1019.21, 5.13.0-1019.21~20.04.1
linux-image-5.13.0-1021-azure (Ubuntu package) - update to 5.13.0-1021.24~20.04.1
linux-image-5.13.0-1021-gcp (Ubuntu package) - addressed in versions 5.13.0-1021.25, 5.13.0-1021.25~20.04.1
linux-image-5.13.0-1022-raspi-nolpae (Ubuntu package) - update to 5.13.0-1022.24
linux-image-5.13.0-1022-raspi (Ubuntu package) - update to 5.13.0-1022.24
linux-image-raspi-nolpae (Ubuntu package) - update to 5.13.0.1022.27
linux-image-5.13.0-1023-oracle (Ubuntu package) - update to 5.13.0-1023.28
linux-image-5.13.0-1025-oracle (Ubuntu package) - update to 5.13.0-1025.30~20.04.1
linux-image-oem-20.04d (Ubuntu package) - update to 5.14.0.1022.19
linux-image-5.14.0-1022-oem (Ubuntu package) - update to 5.14.0-1022.24

• https://ubuntu.com/security/notices/USN-5337-1

• Ubuntu update for linux
• Ubuntu update for linux
• Ubuntu update for linux-azure-5.13
• Ubuntu update for linux-bluefield
• Debian update for linux
• SUSE update for the Linux Kernel
• SUSE update for the Linux Kernel
• SUSE update for the Linux Kernel
• Ubuntu update for linux-oem-5.14
• Anolis OS update for kernel