Use of uninitialized resource in Linux kernel - CVE-2021-34693

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Main Vulnerability Database Vulnerabilities #VU55263

Use of uninitialized resource in Linux kernel - CVE-2021-34693

Published: July 22, 2021


Vulnerability identifier: #VU55263
CSH Severity: Low
CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-34693
CWE-ID: CWE-908
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

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

The vulnerability exists due to net/can/bcm.c in the Linux kernel through 5.12.10 allows local users to obtain sensitive information from kernel stack memory because parts of a data structure are uninitialized.


Affected software

Linux kernel
Anolis OS
Slackware Linux
Ubuntu
openEuler
linux (Debian package)
linux-image-aws-hwe (Ubuntu package)
linux-image-kvm (Ubuntu package)
linux-image-virtual-lts-xenial (Ubuntu package)
linux-image-lowlatency-lts-xenial (Ubuntu package)
linux-image-4.4.0-1099-aws (Ubuntu package)
linux-image-generic-lts-xenial (Ubuntu package)
linux-image-lowlatency (Ubuntu package)
linux-image-4.4.0-219-generic (Ubuntu package)
linux-image-4.4.0-1135-aws (Ubuntu package)
linux-image-4.4.0-1100-kvm (Ubuntu package)
linux-image-4.4.0-219-lowlatency (Ubuntu package)
linux-image-aws (Ubuntu package)
linux-image-generic (Ubuntu package)
linux-image-virtual (Ubuntu package)
linux-4.4.276/kernel-modules
linux-4.4.276/kernel-huge
linux-4.4.276/kernel-generic
linux-4.4.276/kernel-headers
linux-image-generic-lpae (Ubuntu package)
linux-image-4.15.0-156-lowlatency (Ubuntu package)
linux-image-4.15.0-156-generic-lpae (Ubuntu package)
linux-image-4.15.0-156-generic (Ubuntu package)
linux-image-generic-hwe-16.04 (Ubuntu package)
linux-image-lowlatency-hwe-16.04 (Ubuntu package)
linux-image-virtual-hwe-16.04 (Ubuntu package)
linux-image-dell300x (Ubuntu package)
linux-image-4.15.0-1027-dell300x (Ubuntu package)
linux-image-4.15.0-1080-oracle (Ubuntu package)
linux-image-oracle-lts-18.04 (Ubuntu package)
linux-image-raspi2 (Ubuntu package)
linux-image-4.15.0-1095-raspi2 (Ubuntu package)
linux-image-4.15.0-1099-kvm (Ubuntu package)
linux-image-4.15.0-1108-gcp (Ubuntu package)
linux-image-gcp-lts-18.04 (Ubuntu package)
linux-image-aws-lts-18.04 (Ubuntu package)
linux-image-4.15.0-1111-aws (Ubuntu package)
linux-image-snapdragon (Ubuntu package)
linux-image-4.15.0-1112-snapdragon (Ubuntu package)
linux-image-azure-lts-18.04 (Ubuntu package)
linux-image-4.15.0-1123-azure (Ubuntu package)
kernel-tools-debuginfo
kernel
kernel-debuginfo
kernel-source
kernel-tools-devel
bpftool-debuginfo
kernel-devel
python3-perf
bpftool
kernel-tools
python3-perf-debuginfo
python2-perf
kernel-debugsource
perf
perf-debuginfo
python2-perf-debuginfo
kernel-modules
kernel-tools-libs-devel
kernel-tools-libs
kernel-modules-internal
kernel-modules-extra
kernel-headers
kernel-debug-modules-extra
kernel-debug-modules
kernel-debug-devel
kernel-debug-core
kernel-debug
kernel-core
python-perf
linux-image-oem (Ubuntu package)
linux-image-oem-osp1 (Ubuntu package)
linux-image-5.4.0-81-generic (Ubuntu package)
linux-image-5.4.0-81-lowlatency (Ubuntu package)
linux-image-5.4.0-81-generic-lpae (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-virtual-hwe-18.04 (Ubuntu package)
linux-image-generic-lpae-hwe-18.04 (Ubuntu package)
linux-image-5.4.0-1022-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-5.4.0-1042-raspi (Ubuntu package)
linux-image-raspi (Ubuntu package)
linux-image-5.4.0-1045-kvm (Ubuntu package)
linux-image-gcp (Ubuntu package)
linux-image-5.4.0-1051-gke (Ubuntu package)
linux-image-gke-5.4 (Ubuntu package)
linux-image-5.4.0-1051-gcp (Ubuntu package)
linux-image-gcp-lts-20.04 (Ubuntu package)
linux-image-gke (Ubuntu package)
linux-image-oracle-lts-20.04 (Ubuntu package)
linux-image-5.4.0-1053-oracle (Ubuntu package)
linux-image-oracle (Ubuntu package)
linux-image-5.4.0-1055-aws (Ubuntu package)
linux-image-aws-lts-20.04 (Ubuntu package)
linux-image-azure (Ubuntu package)
linux-image-azure-lts-20.04 (Ubuntu package)
linux-image-5.4.0-1056-azure (Ubuntu package)
linux-image-generic-64k (Ubuntu package)
linux-image-oem-20.04 (Ubuntu package)
linux-image-5.11.0-34-generic (Ubuntu package)
linux-image-5.11.0-34-lowlatency (Ubuntu package)
linux-image-5.11.0-34-generic-64k (Ubuntu package)
linux-image-5.11.0-34-generic-lpae (Ubuntu package)
linux-image-generic-64k-hwe-20.04 (Ubuntu package)
linux-image-virtual-hwe-20.04 (Ubuntu package)
linux-image-lowlatency-hwe-20.04 (Ubuntu package)
linux-image-generic-hwe-20.04 (Ubuntu package)
linux-image-generic-lpae-hwe-20.04 (Ubuntu package)
linux-image-5.11.0-1015-kvm (Ubuntu package)
linux-image-5.11.0-1015-azure (Ubuntu package)
linux-image-raspi-nolpae (Ubuntu package)
linux-image-5.11.0-1017-raspi-nolpae (Ubuntu package)
linux-image-5.11.0-1017-raspi (Ubuntu package)
linux-image-5.11.0-1017-oracle (Ubuntu package)
linux-image-5.11.0-1017-aws (Ubuntu package)
linux-image-5.11.0-1018-gcp (Ubuntu package)

How to mitigate CVE-2021-34693

Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

linux (Debian package) - update to 4.19.194-3
linux-image-aws-hwe (Ubuntu package) - update to Ubuntu Pro (Infra-only)
linux-image-kvm (Ubuntu package) - addressed in versions 4.4.0.219.226, 4.15.0.1099.95, 5.4.0.1045.44, 5.11.0.1015.16
linux-image-virtual-lts-xenial (Ubuntu package) - update to 4.4.0.219.226
linux-image-lowlatency-lts-xenial (Ubuntu package) - update to 4.4.0.219.226
linux-image-4.4.0-1099-aws (Ubuntu package) - update to 4.4.0.219.226
linux-image-generic-lts-xenial (Ubuntu package) - update to 4.4.0.219.226
linux-image-lowlatency (Ubuntu package) - addressed in versions 4.4.0.219.226, 4.15.0.156.145, 5.4.0.81.85, 5.11.0.34.36
linux-image-4.4.0-219-generic (Ubuntu package) - update to 4.4.0.219.226
linux-image-4.4.0-1135-aws (Ubuntu package) - update to 4.4.0.219.226
linux-image-4.4.0-1100-kvm (Ubuntu package) - update to 4.4.0.219.226
linux-image-4.4.0-219-lowlatency (Ubuntu package) - update to 4.4.0.219.226
linux-image-aws (Ubuntu package) - addressed in versions 4.4.0.219.226, 5.4.0.1055.38, 5.11.0.1017.18~20.04.16
linux-image-generic (Ubuntu package) - addressed in versions 4.4.0.219.226, 4.15.0.156.145, 5.4.0.81.85, 5.11.0.34.36
linux-image-virtual (Ubuntu package) - addressed in versions 4.4.0.219.226, 4.15.0.156.145, 5.4.0.81.85, 5.11.0.34.36
linux-4.4.276/kernel-modules - update to 4.4.276
linux-4.4.276/kernel-huge - update to 4.4.276
linux-4.4.276/kernel-generic - update to 4.4.276
linux-4.4.276/kernel-headers - update to 4.4.276_smp
linux-image-generic-lpae (Ubuntu package) - addressed in versions 4.15.0.156.145, 5.4.0.81.85, 5.11.0.34.36
linux-image-4.15.0-156-lowlatency (Ubuntu package) - update to 4.15.0-156.163
linux-image-4.15.0-156-generic-lpae (Ubuntu package) - update to 4.15.0-156.163
linux-image-4.15.0-156-generic (Ubuntu package) - update to 4.15.0-156.163
linux-image-generic-hwe-16.04 (Ubuntu package) - update to 4.15.0.210.193
linux-image-lowlatency-hwe-16.04 (Ubuntu package) - update to 4.15.0.210.193
linux-image-virtual-hwe-16.04 (Ubuntu package) - update to 4.15.0.210.193
linux-image-dell300x (Ubuntu package) - update to 4.15.0.1027.29
linux-image-4.15.0-1027-dell300x (Ubuntu package) - update to 4.15.0-1027.32
linux-image-4.15.0-1080-oracle (Ubuntu package) - update to 4.15.0-1080.88
linux-image-oracle-lts-18.04 (Ubuntu package) - update to 4.15.0.1080.90
linux-image-raspi2 (Ubuntu package) - addressed in versions 4.15.0.1095.93, 5.4.0.1042.77
linux-image-4.15.0-1095-raspi2 (Ubuntu package) - update to 4.15.0-1095.101
linux-image-4.15.0-1099-kvm (Ubuntu package) - update to 4.15.0-1099.101
linux-image-4.15.0-1108-gcp (Ubuntu package) - update to 4.15.0-1108.122
linux-image-gcp-lts-18.04 (Ubuntu package) - update to 4.15.0.1108.127
linux-image-aws-lts-18.04 (Ubuntu package) - update to 4.15.0.1111.114
linux-image-4.15.0-1111-aws (Ubuntu package) - update to 4.15.0-1111.118
linux-image-snapdragon (Ubuntu package) - update to 4.15.0.1112.115
linux-image-4.15.0-1112-snapdragon (Ubuntu package) - update to 4.15.0-1112.121
linux-image-azure-lts-18.04 (Ubuntu package) - update to 4.15.0.1123.96
linux-image-4.15.0-1123-azure (Ubuntu package) - update to 4.15.0-1123.136
kernel-tools-debuginfo - update to 4.19.90-2107.4.0.0097
kernel - update to 4.19.90-2107.4.0.0097
kernel-debuginfo - update to 4.19.90-2107.4.0.0097
kernel-source - update to 4.19.90-2107.4.0.0097
kernel-tools-devel - update to 4.19.90-2107.4.0.0097
bpftool-debuginfo - update to 4.19.90-2107.4.0.0097
kernel-devel - update to 4.19.90-2107.4.0.0097
python3-perf - update to 4.19.90-2107.4.0.0097
bpftool - update to 4.19.90-2107.4.0.0097
kernel-tools - update to 4.19.90-2107.4.0.0097
python3-perf-debuginfo - update to 4.19.90-2107.4.0.0097
python2-perf - update to 4.19.90-2107.4.0.0097
kernel-debugsource - update to 4.19.90-2107.4.0.0097
perf - update to 4.19.90-2107.4.0.0097
perf-debuginfo - update to 4.19.90-2107.4.0.0097
python2-perf-debuginfo - update to 4.19.90-2107.4.0.0097
kernel-modules - update to 4.19.91-25.6
perf - addressed in versions 4.19.91-25.6, 4.19.91-26
kernel-tools-libs-devel - addressed in versions 4.19.91-25.6, 4.19.91-26
kernel-tools-libs - addressed in versions 4.19.91-25.6, 4.19.91-26
bpftool - addressed in versions 4.19.91-25.6, 4.19.91-26
python3-perf - update to 4.19.91-25.6
kernel-tools - addressed in versions 4.19.91-25.6, 4.19.91-26
kernel-modules-internal - update to 4.19.91-25.6
kernel-modules-extra - update to 4.19.91-25.6
kernel-headers - addressed in versions 4.19.91-25.6, 4.19.91-26
kernel-devel - addressed in versions 4.19.91-25.6, 4.19.91-26
kernel-debug-modules-extra - update to 4.19.91-25.6
kernel-debug-modules - update to 4.19.91-25.6
kernel-debug-devel - addressed in versions 4.19.91-25.6, 4.19.91-26
kernel-debug-core - update to 4.19.91-25.6
kernel-debug - addressed in versions 4.19.91-25.6, 4.19.91-26
kernel-core - update to 4.19.91-25.6
kernel - addressed in versions 4.19.91-25.6, 4.19.91-26
python-perf - update to 4.19.91-26
linux-image-oem (Ubuntu package) - addressed in versions 5.4.0.81.85, 5.4.0.81.91~18.04.73, 5.4.0.202.198
linux-image-oem-osp1 (Ubuntu package) - addressed in versions 5.4.0.81.85, 5.4.0.81.91~18.04.73
linux-image-5.4.0-81-generic (Ubuntu package) - addressed in versions 5.4.0-81.91, 5.4.0-81.91~18.04.1
linux-image-5.4.0-81-lowlatency (Ubuntu package) - addressed in versions 5.4.0-81.91, 5.4.0-81.91~18.04.1
linux-image-5.4.0-81-generic-lpae (Ubuntu package) - addressed in versions 5.4.0-81.91, 5.4.0-81.91~18.04.1
linux-image-generic-hwe-18.04 (Ubuntu package) - update to 5.4.0.81.91~18.04.73
linux-image-lowlatency-hwe-18.04 (Ubuntu package) - update to 5.4.0.81.91~18.04.73
linux-image-snapdragon-hwe-18.04 (Ubuntu package) - update to 5.4.0.81.91~18.04.73
linux-image-virtual-hwe-18.04 (Ubuntu package) - update to 5.4.0.81.91~18.04.73
linux-image-generic-lpae-hwe-18.04 (Ubuntu package) - update to 5.4.0.81.91~18.04.73
linux-image-5.4.0-1022-gkeop (Ubuntu package) - addressed in versions 5.4.0-1022.23, 5.4.0-1022.23~18.04.1
linux-image-gkeop-5.4 (Ubuntu package) - addressed in versions 5.4.0.1022.23~18.04.23, 5.4.0.1022.25
linux-image-gkeop (Ubuntu package) - update to 5.4.0.1022.25
linux-image-raspi-hwe-18.04 (Ubuntu package) - update to 5.4.0.1042.45
linux-image-5.4.0-1042-raspi (Ubuntu package) - addressed in versions 5.4.0-1042.46, 5.4.0-1042.46~18.04.3
linux-image-raspi (Ubuntu package) - addressed in versions 5.4.0.1042.77, 5.11.0.1017.15
linux-image-5.4.0-1045-kvm (Ubuntu package) - update to 5.4.0-1045.47
linux-image-gcp (Ubuntu package) - addressed in versions 5.4.0.1051.37, 5.11.0.1018.18, 6.8.0-1019.21~22.04.1
linux-image-5.4.0-1051-gke (Ubuntu package) - addressed in versions 5.4.0-1051.54, 5.4.0-1051.54~18.04.1
linux-image-gke-5.4 (Ubuntu package) - addressed in versions 5.4.0.1051.54~18.04.16, 5.4.0.1051.61
linux-image-5.4.0-1051-gcp (Ubuntu package) - addressed in versions 5.4.0-1051.55, 5.4.0-1051.55~18.04.1
linux-image-gcp-lts-20.04 (Ubuntu package) - update to 5.4.0.1051.61
linux-image-gke (Ubuntu package) - addressed in versions 5.4.0.1051.61, 5.11.0.1018.18, 6.8.0-1015.19
linux-image-oracle-lts-20.04 (Ubuntu package) - update to 5.4.0.1053.53
linux-image-5.4.0-1053-oracle (Ubuntu package) - addressed in versions 5.4.0-1053.57, 5.4.0-1053.57~18.04.1
linux-image-oracle (Ubuntu package) - addressed in versions 5.4.0.1053.57~18.04.33, 5.11.0.1017.18~20.04.10, 6.8.0-1017.18~22.04.1
linux-image-5.4.0-1055-aws (Ubuntu package) - addressed in versions 5.4.0-1055.58, 5.4.0-1055.58~18.04.1
linux-image-aws-lts-20.04 (Ubuntu package) - update to 5.4.0.1055.58
linux-image-azure (Ubuntu package) - addressed in versions 5.4.0.1056.36, 5.11.0.1015.16, 6.8.0-1018.21~22.04.1
linux-image-azure-lts-20.04 (Ubuntu package) - update to 5.4.0.1056.54
linux-image-5.4.0-1056-azure (Ubuntu package) - addressed in versions 5.4.0-1056.58, 5.4.0-1056.58~18.04.1
linux-image-generic-64k (Ubuntu package) - update to 5.11.0.34.36
linux-image-oem-20.04 (Ubuntu package) - update to 5.11.0.34.36
linux-image-5.11.0-34-generic (Ubuntu package) - update to 5.11.0-34.36~20.04.1
linux-image-5.11.0-34-lowlatency (Ubuntu package) - update to 5.11.0-34.36~20.04.1
linux-image-5.11.0-34-generic-64k (Ubuntu package) - update to 5.11.0-34.36~20.04.1
linux-image-5.11.0-34-generic-lpae (Ubuntu package) - update to 5.11.0-34.36~20.04.1
linux-image-generic-64k-hwe-20.04 (Ubuntu package) - update to 5.11.0.34.36~20.04.13
linux-image-virtual-hwe-20.04 (Ubuntu package) - update to 5.11.0.34.36~20.04.13
linux-image-lowlatency-hwe-20.04 (Ubuntu package) - update to 5.11.0.34.36~20.04.13
linux-image-generic-hwe-20.04 (Ubuntu package) - update to 5.11.0.34.36~20.04.13
linux-image-generic-lpae-hwe-20.04 (Ubuntu package) - update to 5.11.0.34.36~20.04.13
linux-image-5.11.0-1015-kvm (Ubuntu package) - update to 5.11.0-1015.16
linux-image-5.11.0-1015-azure (Ubuntu package) - update to 5.11.0-1015.16~20.04.1
linux-image-raspi-nolpae (Ubuntu package) - update to 5.11.0.1017.15
linux-image-5.11.0-1017-raspi-nolpae (Ubuntu package) - update to 5.11.0-1017.18
linux-image-5.11.0-1017-raspi (Ubuntu package) - update to 5.11.0-1017.18
linux-image-5.11.0-1017-oracle (Ubuntu package) - update to 5.11.0-1017.18~20.04.1
linux-image-5.11.0-1017-aws (Ubuntu package) - update to 5.11.0-1017.18~20.04.1
linux-image-5.11.0-1018-gcp (Ubuntu package) - update to 5.11.0-1018.20

External References

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