Race condition in Linux kernel - CVE-2021-47163

Vulnerability identifier: #VU93381

CSH Severity: Low

CVSS v4 BT: 4.3 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-47163

CWE-ID: CWE-362

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to a race condition within the cleanup_bearer() and tipc_udp_disable() functions in net/tipc/udp_media.c, within the tipc_exit_net() function in net/tipc/core.c. A local user can perform a denial of service (DoS) attack.

Linux kernel
SUSE Linux Enterprise Server 12 SP5
SUSE Linux Enterprise Server 12 SP5 LTSS Extended
SUSE Linux Enterprise High Availability Extension 12
SUSE Linux Enterprise High Performance Computing 12
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise Server for SAP Applications 12
SUSE Linux Enterprise Micro
SUSE Linux Enterprise Micro for Rancher
SUSE Linux Enterprise Live Patching
Ubuntu
openEuler
linux-image-oracle-lts-18.04 (Ubuntu package)
linux-image-virtual-hwe-16.04 (Ubuntu package)
linux-image-oracle (Ubuntu package)
linux-image-oem (Ubuntu package)
linux-image-lowlatency-hwe-16.04 (Ubuntu package)
linux-image-gke (Ubuntu package)
linux-image-generic-hwe-16.04 (Ubuntu package)
linux-image-gcp (Ubuntu package)
linux-image-aws-hwe (Ubuntu package)
linux-image-virtual (Ubuntu package)
linux-image-4.15.0-2097-azure-fips (Ubuntu package)
linux-image-lowlatency (Ubuntu package)
linux-image-kvm (Ubuntu package)
linux-image-generic (Ubuntu package)
linux-image-gcp-lts-18.04 (Ubuntu package)
linux-image-aws-lts-18.04 (Ubuntu package)
linux-image-4.15.0-237-lowlatency (Ubuntu package)
linux-image-4.15.0-237-generic (Ubuntu package)
linux-image-4.15.0-1180-aws (Ubuntu package)
linux-image-4.15.0-1142-oracle (Ubuntu package)
linux-image-4.15.0-1135-fips (Ubuntu package)
linux-image-4.15.0-2081-gcp-fips (Ubuntu package)
linux-image-4.15.0-2118-aws-fips (Ubuntu package)
linux-image-aws-fips (Ubuntu package)
linux-image-fips (Ubuntu package)
linux-image-gcp-fips (Ubuntu package)
linux-image-4.15.0-1163-kvm (Ubuntu package)
linux-image-4.15.0-1173-gcp (Ubuntu package)
linux-image-azure (Ubuntu package)
linux-image-azure-lts-18.04 (Ubuntu package)
linux-image-4.15.0-1188-azure (Ubuntu package)
linux-image-azure-fips (Ubuntu package)
kgraft-patch-4_12_14-122_234-default
linux (Ubuntu package)
linux-lts-xenial (Ubuntu package)
linux-fips (Ubuntu package)
linux-aws (Ubuntu package)
kernel-default-debuginfo
kernel-default-devel
kernel-default-base-debuginfo
kernel-syms
ocfs2-kmp-default
dlm-kmp-default-debuginfo
gfs2-kmp-default
kernel-default
kernel-devel
kernel-macros
kernel-source
kernel-default-man
kernel-default-devel-debuginfo
cluster-md-kmp-default
ocfs2-kmp-default-debuginfo
kernel-default-debugsource
gfs2-kmp-default-debuginfo
dlm-kmp-default
cluster-md-kmp-default-debuginfo
kernel-default-kgraft
kernel-default-kgraft-devel
kernel-default-base
python3-perf
python2-perf-debuginfo
kernel-debugsource
python2-perf
perf
kernel-tools-devel
perf-debuginfo
python3-perf-debuginfo
kernel-tools
bpftool-debuginfo
kernel-tools-debuginfo
bpftool
kernel-debuginfo
kernel
kernel-source-rt
kernel-rt-debuginfo
kernel-rt-debugsource
kernel-rt
Dell Secure Connect Gateway

Install update from vendor's website.

Linux kernel - addressed in versions 5.4.124, 5.10.42, 5.12.9, 5.13
linux-image-oracle-lts-18.04 (Ubuntu package) - update to Ubuntu Pro
linux-image-virtual-hwe-16.04 (Ubuntu package) - update to Ubuntu Pro (Infra-only)
linux-image-oracle (Ubuntu package) - update to Ubuntu Pro (Infra-only)
linux-image-oem (Ubuntu package) - update to Ubuntu Pro (Infra-only)
linux-image-lowlatency-hwe-16.04 (Ubuntu package) - update to Ubuntu Pro (Infra-only)
linux-image-gke (Ubuntu package) - update to Ubuntu Pro (Infra-only)
linux-image-generic-hwe-16.04 (Ubuntu package) - update to Ubuntu Pro (Infra-only)
linux-image-gcp (Ubuntu package) - update to Ubuntu Pro (Infra-only)
linux-image-aws-hwe (Ubuntu package) - update to Ubuntu Pro (Infra-only)
linux-image-virtual (Ubuntu package) - update to Ubuntu Pro (Infra-only)
linux-image-4.15.0-2097-azure-fips (Ubuntu package) - update to Ubuntu Pro
linux-image-lowlatency (Ubuntu package) - update to Ubuntu Pro (Infra-only)
linux-image-kvm (Ubuntu package) - update to Ubuntu Pro (Infra-only)
linux-image-generic (Ubuntu package) - update to Ubuntu Pro (Infra-only)
linux-image-gcp-lts-18.04 (Ubuntu package) - update to Ubuntu Pro
linux-image-aws-lts-18.04 (Ubuntu package) - update to Ubuntu Pro
linux-image-4.15.0-237-lowlatency (Ubuntu package) - update to Ubuntu Pro
linux-image-4.15.0-237-generic (Ubuntu package) - update to Ubuntu Pro
linux-image-4.15.0-1180-aws (Ubuntu package) - update to Ubuntu Pro
linux-image-4.15.0-1142-oracle (Ubuntu package) - update to Ubuntu Pro
linux-image-4.15.0-1135-fips (Ubuntu package) - update to Ubuntu Pro
linux-image-4.15.0-2081-gcp-fips (Ubuntu package) - update to Ubuntu Pro
linux-image-4.15.0-2118-aws-fips (Ubuntu package) - update to Ubuntu Pro
linux-image-aws-fips (Ubuntu package) - update to Ubuntu Pro
linux-image-fips (Ubuntu package) - update to Ubuntu Pro
linux-image-gcp-fips (Ubuntu package) - update to Ubuntu Pro
linux-image-4.15.0-1163-kvm (Ubuntu package) - update to Ubuntu Pro
linux-image-4.15.0-1173-gcp (Ubuntu package) - update to Ubuntu Pro
linux-image-azure (Ubuntu package) - update to Ubuntu Pro (Infra-only)
linux-image-azure-lts-18.04 (Ubuntu package) - update to Ubuntu Pro
linux-image-4.15.0-1188-azure (Ubuntu package) - update to Ubuntu Pro
linux-image-azure-fips (Ubuntu package) - update to Ubuntu Pro
kgraft-patch-4_12_14-122_234-default - update to 1-8.3.1
linux (Ubuntu package) - addressed in versions 4.4.0.268.274, 4.4.0-268.302, 4.4.0.1144.141, 4.4.0-1144.155, 4.4.0.1181.185, 4.4.0-1181.196
linux-lts-xenial (Ubuntu package) - addressed in versions 4.4.0.268.302~14.04.1, 4.4.0-268.302~14.04.1
linux-fips (Ubuntu package) - addressed in versions 4.4.0.1113.114, 4.4.0-1113.120
linux-aws (Ubuntu package) - addressed in versions 4.4.0.1143.140, 4.4.0-1143.149
kernel-default-debuginfo - update to 4.12.14-122.234.1
kernel-default-devel - update to 4.12.14-122.234.1
kernel-default-base-debuginfo - update to 4.12.14-122.234.1
kernel-syms - update to 4.12.14-122.234.1
ocfs2-kmp-default - update to 4.12.14-122.234.1
dlm-kmp-default-debuginfo - update to 4.12.14-122.234.1
gfs2-kmp-default - update to 4.12.14-122.234.1
kernel-default - update to 4.12.14-122.234.1
kernel-devel - update to 4.12.14-122.234.1
kernel-macros - update to 4.12.14-122.234.1
kernel-source - update to 4.12.14-122.234.1
kernel-default-man - update to 4.12.14-122.234.1
kernel-default-devel-debuginfo - update to 4.12.14-122.234.1
cluster-md-kmp-default - update to 4.12.14-122.234.1
ocfs2-kmp-default-debuginfo - update to 4.12.14-122.234.1
kernel-default-debugsource - update to 4.12.14-122.234.1
gfs2-kmp-default-debuginfo - update to 4.12.14-122.234.1
dlm-kmp-default - update to 4.12.14-122.234.1
cluster-md-kmp-default-debuginfo - update to 4.12.14-122.234.1
kernel-default-kgraft - update to 4.12.14-122.234.1
kernel-default-kgraft-devel - update to 4.12.14-122.234.1
kernel-default-base - update to 4.12.14-122.234.1
python3-perf - addressed in versions 4.19.90-2404.2.0.0246, 4.19.90-2404.2.0.0273
kernel-source - addressed in versions 4.19.90-2404.2.0.0246, 4.19.90-2404.2.0.0273
python2-perf-debuginfo - addressed in versions 4.19.90-2404.2.0.0246, 4.19.90-2404.2.0.0273
kernel-debugsource - addressed in versions 4.19.90-2404.2.0.0246, 4.19.90-2404.2.0.0273
python2-perf - addressed in versions 4.19.90-2404.2.0.0246, 4.19.90-2404.2.0.0273
perf - addressed in versions 4.19.90-2404.2.0.0246, 4.19.90-2404.2.0.0273
kernel-tools-devel - addressed in versions 4.19.90-2404.2.0.0246, 4.19.90-2404.2.0.0273
perf-debuginfo - addressed in versions 4.19.90-2404.2.0.0246, 4.19.90-2404.2.0.0273
python3-perf-debuginfo - addressed in versions 4.19.90-2404.2.0.0246, 4.19.90-2404.2.0.0273
kernel-tools - addressed in versions 4.19.90-2404.2.0.0246, 4.19.90-2404.2.0.0273
bpftool-debuginfo - addressed in versions 4.19.90-2404.2.0.0246, 4.19.90-2404.2.0.0273
kernel-tools-debuginfo - addressed in versions 4.19.90-2404.2.0.0246, 4.19.90-2404.2.0.0273
bpftool - addressed in versions 4.19.90-2404.2.0.0246, 4.19.90-2404.2.0.0273
kernel-debuginfo - addressed in versions 4.19.90-2404.2.0.0246, 4.19.90-2404.2.0.0273
kernel-devel - addressed in versions 4.19.90-2404.2.0.0246, 4.19.90-2404.2.0.0273
kernel - addressed in versions 4.19.90-2404.2.0.0246, 4.19.90-2404.2.0.0273
kernel-source-rt - update to 5.3.18-150300.208.1
kernel-rt-debuginfo - update to 5.3.18-150300.208.1
kernel-rt-debugsource - update to 5.3.18-150300.208.1
kernel-rt - update to 5.3.18-150300.208.1
Dell Secure Connect Gateway - update to 5.28.00.14

• https://git.kernel.org/stable/c/d1f76dfadaf8f47ed1753f97dbcbd41c16215ffa
• https://git.kernel.org/stable/c/5195ec5e365a2a9331bfeb585b613a6e94f98dba
• https://git.kernel.org/stable/c/b9f5b7ad4ac3af006443f535b1ce7bff1d130d7d
• https://git.kernel.org/stable/c/04c26faa51d1e2fe71cf13c45791f5174c37f986
• https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.42
• https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.12.9
• https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.13
• https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4.124

• Race condition in Linux kernel tipc
• openEuler 20.03 LTS SP1 update for kernel
• openEuler 20.03 LTS SP4 update for kernel
• SUSE update for the Linux Kernel
• SUSE update for the Linux Kernel
• Ubuntu update for linux-aws-fips
• Ubuntu update for linux
• Ubuntu update for linux-azure-fips
• Ubuntu update for linux-azure
• Ubuntu update for linux-azure
• SUSE update for the Linux Kernel
• Multiple vulnerabilities in Dell Secure Connect Gateway
• Ubuntu update for linux-aws
• Ubuntu update for linux
• Ubuntu update for linux-fips
• Ubuntu update for linux-lts-xenial