Race condition in Linux kernel - CVE-2021-4001

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Main Vulnerability Database Vulnerabilities #VU81665

Race condition in Linux kernel - CVE-2021-4001

Published: October 5, 2023


Vulnerability identifier: #VU81665
CSH Severity: Low
CVSS v4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-4001
CWE-ID: CWE-362
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a race condition in kernel/bpf/syscall.c in Linux kernel ebpf. A local user can exploit the race between bpf_map_update_elem and bpf_map_freeze and modify the frozen mapped address space.


Affected software

Linux kernel
SUSE MicroOS
SUSE Linux Enterprise Micro
SUSE Linux Enterprise Module for Realtime
SUSE Linux Enterprise Server for SAP Applications
SUSE Linux Enterprise Module for Live Patching
SUSE Linux Enterprise High Availability
SUSE Linux Enterprise Module for Basesystem
SUSE Linux Enterprise Module for Development Tools
SUSE Linux Enterprise Module for Legacy Software
SUSE Linux Enterprise Workstation Extension
SUSE Linux Enterprise Module for Public Cloud
SUSE Linux Enterprise High Performance Computing
SUSE Linux Enterprise Server
Ubuntu
Fedora
linux-image-5.4.0-1110-oracle (Ubuntu package)
linux-image-5.4.0-164-lowlatency (Ubuntu package)
linux-image-oem (Ubuntu package)
linux-image-5.4.0-164-generic (Ubuntu package)
linux-image-oem-osp1 (Ubuntu package)
linux-image-5.4.0-1117-azure (Ubuntu package)
linux-image-aws (Ubuntu package)
linux-image-5.4.0-1115-gcp (Ubuntu package)
linux-image-azure (Ubuntu package)
linux-image-5.4.0-1111-aws (Ubuntu package)
linux-image-gcp (Ubuntu package)
linux-image-generic-hwe-18.04 (Ubuntu package)
linux-image-ibm (Ubuntu package)
linux-image-5.4.0-1095-raspi (Ubuntu package)
linux-image-lowlatency-hwe-18.04 (Ubuntu package)
linux-image-oracle (Ubuntu package)
linux-image-raspi-hwe-18.04 (Ubuntu package)
linux-image-5.4.0-1058-ibm (Ubuntu package)
linux-image-snapdragon-hwe-18.04 (Ubuntu package)
linux-image-virtual-hwe-18.04 (Ubuntu package)
kernel-livepatch-5_3_18-59_40-default
kernel-azure
kernel-azure-debuginfo
kernel-azure-debugsource
kernel-azure-devel
kernel-azure-devel-debuginfo
kernel-syms-azure
kernel-devel-azure
kernel-source-azure
kernel-macros
kernel-syms
kernel-preempt-devel
kernel-preempt-devel-debuginfo
kernel-zfcpdump
kernel-obs-build-debugsource
kernel-devel
kernel-64kb-devel-debuginfo
kernel-64kb-devel
kernel-64kb-debugsource
kernel-64kb-debuginfo
kernel-64kb
kernel-preempt
kernel-default-devel-debuginfo
kernel-default-devel
kernel-source
kernel-docs
cluster-md-kmp-default
gfs2-kmp-default-debuginfo
kernel-default-livepatch-devel
kernel-default-livepatch
kernel-preempt-extra-debuginfo
gfs2-kmp-default
dlm-kmp-default-debuginfo
kernel-preempt-extra
kernel-preempt-debugsource
kernel-preempt-debuginfo
kernel-default-extra-debuginfo
dlm-kmp-default
cluster-md-kmp-default-debuginfo
ocfs2-kmp-default
kernel-obs-build
ocfs2-kmp-default-debuginfo
kernel-default-extra
kernel-default-debugsource
kernel-default-debuginfo
kernel-zfcpdump-debugsource
kernel-zfcpdump-debuginfo
kernel-default
reiserfs-kmp-default
reiserfs-kmp-default-debuginfo
kernel-default-base
kernel-syms-rt
kernel-rt-devel
ocfs2-kmp-rt-debuginfo
gfs2-kmp-rt-debuginfo
gfs2-kmp-rt
dlm-kmp-rt-debuginfo
dlm-kmp-rt
cluster-md-kmp-rt-debuginfo
cluster-md-kmp-rt
kernel-source-rt
kernel-devel-rt
kernel-rt-debugsource
kernel-rt-debuginfo
kernel-rt-devel-debuginfo
kernel-rt_debug
kernel-rt_debug-debuginfo
kernel-rt_debug-debugsource
kernel-rt_debug-devel
kernel-rt_debug-devel-debuginfo
ocfs2-kmp-rt
kernel-rt
linux-image-virtual (Ubuntu package)
linux-image-lowlatency (Ubuntu package)
linux-image-generic-lpae (Ubuntu package)
linux-image-generic (Ubuntu package)
linux-image-5.4.0-164-generic-lpae (Ubuntu package)
linux-image-5.4.0-1023-iot (Ubuntu package)
linux-image-xilinx-zynqmp (Ubuntu package)
linux-image-5.4.0-1031-xilinx-zynqmp (Ubuntu package)
linux-image-ibm-lts-20.04 (Ubuntu package)
linux-image-bluefield (Ubuntu package)
linux-image-5.4.0-1072-bluefield (Ubuntu package)
linux-image-gkeop-5.4 (Ubuntu package)
linux-image-gkeop (Ubuntu package)
linux-image-5.4.0-1078-gkeop (Ubuntu package)
linux-image-raspi (Ubuntu package)
linux-image-raspi2 (Ubuntu package)
linux-image-kvm (Ubuntu package)
linux-image-5.4.0-1100-kvm (Ubuntu package)
linux-image-oracle-lts-20.04 (Ubuntu package)
linux-image-aws-lts-20.04 (Ubuntu package)
linux-image-gcp-lts-20.04 (Ubuntu package)
linux-image-azure-lts-20.04 (Ubuntu package)
linux-image-5.10.0-1053-oem (Ubuntu package)
linux-image-oem-20.04 (Ubuntu package)
linux-image-oem-20.04b (Ubuntu package)
linux-image-5.11.0-1028-oracle (Ubuntu package)
linux-image-5.11.0-1028-azure (Ubuntu package)
linux-image-5.11.0-1029-gcp (Ubuntu package)
linux-image-5.13.0-28-generic-64k (Ubuntu package)
linux-image-5.13.0-28-generic-lpae (Ubuntu package)
linux-image-5.13.0-28-lowlatency (Ubuntu package)
linux-image-5.13.0-28-generic (Ubuntu package)
linux-image-virtual-hwe-20.04 (Ubuntu package)
linux-image-lowlatency-hwe-20.04 (Ubuntu package)
linux-image-generic-lpae-hwe-20.04 (Ubuntu package)
linux-image-generic-hwe-20.04 (Ubuntu package)
linux-image-generic-64k-hwe-20.04 (Ubuntu package)
linux-image-generic-64k (Ubuntu package)
linux-image-5.13.0-1011-kvm (Ubuntu package)
linux-image-5.13.0-1012-aws (Ubuntu package)
linux-image-gke (Ubuntu package)
linux-image-5.13.0-1013-gcp (Ubuntu package)
linux-image-5.13.0-1016-raspi (Ubuntu package)
linux-image-5.13.0-1016-raspi-nolpae (Ubuntu package)
linux-image-5.13.0-1016-oracle (Ubuntu package)
linux-image-raspi-nolpae (Ubuntu package)
linux-image-oem-20.04c (Ubuntu package)
linux-image-5.13.0-1029-oem (Ubuntu package)
linux-image-oem-20.04d (Ubuntu package)
linux-image-5.14.0-1022-oem (Ubuntu package)
kernel
kernel-livepatch-5_3_18-59_37-default-debuginfo
kernel-livepatch-SLE15-SP3_Update_10-debugsource
kernel-livepatch-5_3_18-59_37-default
kernel-livepatch-5_3_18-59_34-default-debuginfo
kernel-livepatch-5_3_18-59_34-default
kernel-livepatch-SLE15-SP3_Update_9-debugsource
kernel-livepatch-5_3_18-59_27-default-debuginfo
kernel-livepatch-5_3_18-59_27-default
kernel-livepatch-5_3_18-59_24-default-debuginfo
kernel-livepatch-5_3_18-59_24-default
kernel-livepatch-SLE15-SP3_Update_6-debugsource
kernel-livepatch-SLE15-SP3_Update_7-debugsource
kernel-livepatch-SLE15-SP3_Update_5-debugsource
kernel-livepatch-5_3_18-59_19-default-debuginfo
kernel-livepatch-5_3_18-59_19-default

How to mitigate CVE-2021-4001

Install updates from vendor's website.

Linux kernel - update to 5.16 rc2
linux-image-5.4.0-1110-oracle (Ubuntu package) - addressed in versions Ubuntu Pro, 5.4.0-1110.119
linux-image-5.4.0-164-lowlatency (Ubuntu package) - addressed in versions Ubuntu Pro, 5.4.0-164.181
linux-image-oem (Ubuntu package) - addressed in versions Ubuntu Pro (Infra-only), 5.4.0.164.161
linux-image-5.4.0-164-generic (Ubuntu package) - addressed in versions Ubuntu Pro, 5.4.0-164.181
linux-image-oem-osp1 (Ubuntu package) - addressed in versions Ubuntu Pro, 5.4.0.164.161
linux-image-5.4.0-1117-azure (Ubuntu package) - addressed in versions Ubuntu Pro, 5.4.0-1117.124
linux-image-aws (Ubuntu package) - addressed in versions Ubuntu Pro (Infra-only), 5.11.0.1028.31~20.04.26, 5.13.0.1012.13
linux-image-5.4.0-1115-gcp (Ubuntu package) - addressed in versions Ubuntu Pro, 5.4.0-1115.124
linux-image-azure (Ubuntu package) - addressed in versions Ubuntu Pro (Infra-only), 5.11.0.1028.31~20.04.26
linux-image-5.4.0-1111-aws (Ubuntu package) - addressed in versions Ubuntu Pro, 5.4.0-1111.120
linux-image-gcp (Ubuntu package) - addressed in versions Ubuntu Pro (Infra-only), 5.11.0.1029.33~20.04.27, 5.13.0.1013.12
linux-image-generic-hwe-18.04 (Ubuntu package) - update to Ubuntu Pro
linux-image-ibm (Ubuntu package) - update to Ubuntu Pro
linux-image-5.4.0-1095-raspi (Ubuntu package) - addressed in versions Ubuntu Pro, 5.4.0-1095.106
linux-image-lowlatency-hwe-18.04 (Ubuntu package) - update to Ubuntu Pro
linux-image-oracle (Ubuntu package) - addressed in versions Ubuntu Pro (Infra-only), 5.11.0.1028.31~20.04.20, 5.13.0.1016.16
linux-image-raspi-hwe-18.04 (Ubuntu package) - update to Ubuntu Pro
linux-image-5.4.0-1058-ibm (Ubuntu package) - addressed in versions Ubuntu Pro, 5.4.0-1058.63
linux-image-snapdragon-hwe-18.04 (Ubuntu package) - update to Ubuntu Pro
linux-image-virtual-hwe-18.04 (Ubuntu package) - update to Ubuntu Pro
kernel-livepatch-5_3_18-59_40-default - update to 1-7.3.1
kernel-azure - update to 5.3.18-38.34.1
kernel-azure-debuginfo - update to 5.3.18-38.34.1
kernel-azure-debugsource - update to 5.3.18-38.34.1
kernel-azure-devel - update to 5.3.18-38.34.1
kernel-azure-devel-debuginfo - update to 5.3.18-38.34.1
kernel-syms-azure - update to 5.3.18-38.34.1
kernel-devel-azure - update to 5.3.18-38.34.1
kernel-source-azure - update to 5.3.18-38.34.1
kernel-macros - update to 5.3.18-59.40.1
kernel-syms - update to 5.3.18-59.40.1
kernel-preempt-devel - update to 5.3.18-59.40.1
kernel-preempt-devel-debuginfo - update to 5.3.18-59.40.1
kernel-zfcpdump - update to 5.3.18-59.40.1
kernel-obs-build-debugsource - update to 5.3.18-59.40.1
kernel-devel - update to 5.3.18-59.40.1
kernel-64kb-devel-debuginfo - update to 5.3.18-59.40.1
kernel-64kb-devel - update to 5.3.18-59.40.1
kernel-64kb-debugsource - update to 5.3.18-59.40.1
kernel-64kb-debuginfo - update to 5.3.18-59.40.1
kernel-64kb - update to 5.3.18-59.40.1
kernel-preempt - update to 5.3.18-59.40.1
kernel-default-devel-debuginfo - update to 5.3.18-59.40.1
kernel-default-devel - update to 5.3.18-59.40.1
kernel-source - update to 5.3.18-59.40.1
kernel-docs - update to 5.3.18-59.40.1
cluster-md-kmp-default - update to 5.3.18-59.40.1
gfs2-kmp-default-debuginfo - update to 5.3.18-59.40.1
kernel-default-livepatch-devel - update to 5.3.18-59.40.1
kernel-default-livepatch - update to 5.3.18-59.40.1
kernel-preempt-extra-debuginfo - update to 5.3.18-59.40.1
gfs2-kmp-default - update to 5.3.18-59.40.1
dlm-kmp-default-debuginfo - update to 5.3.18-59.40.1
kernel-preempt-extra - update to 5.3.18-59.40.1
kernel-preempt-debugsource - update to 5.3.18-59.40.1
kernel-preempt-debuginfo - update to 5.3.18-59.40.1
kernel-default-extra-debuginfo - update to 5.3.18-59.40.1
dlm-kmp-default - update to 5.3.18-59.40.1
cluster-md-kmp-default-debuginfo - update to 5.3.18-59.40.1
ocfs2-kmp-default - update to 5.3.18-59.40.1
kernel-obs-build - update to 5.3.18-59.40.1
ocfs2-kmp-default-debuginfo - update to 5.3.18-59.40.1
kernel-default-extra - update to 5.3.18-59.40.1
kernel-default-debugsource - update to 5.3.18-59.40.1
kernel-default-debuginfo - update to 5.3.18-59.40.1
kernel-zfcpdump-debugsource - update to 5.3.18-59.40.1
kernel-zfcpdump-debuginfo - update to 5.3.18-59.40.1
kernel-default - update to 5.3.18-59.40.1
reiserfs-kmp-default - update to 5.3.18-59.40.1
reiserfs-kmp-default-debuginfo - update to 5.3.18-59.40.1
kernel-default-base - update to 5.3.18-59.40.1.18.25.1
kernel-syms-rt - addressed in versions 5.3.18-65.1, 5.3.18-68.1
kernel-rt-devel - addressed in versions 5.3.18-65.2, 5.3.18-68.1
ocfs2-kmp-rt-debuginfo - addressed in versions 5.3.18-65.2, 5.3.18-68.1
gfs2-kmp-rt-debuginfo - addressed in versions 5.3.18-65.2, 5.3.18-68.1
gfs2-kmp-rt - addressed in versions 5.3.18-65.2, 5.3.18-68.1
dlm-kmp-rt-debuginfo - addressed in versions 5.3.18-65.2, 5.3.18-68.1
dlm-kmp-rt - addressed in versions 5.3.18-65.2, 5.3.18-68.1
cluster-md-kmp-rt-debuginfo - addressed in versions 5.3.18-65.2, 5.3.18-68.1
cluster-md-kmp-rt - addressed in versions 5.3.18-65.2, 5.3.18-68.1
kernel-source-rt - addressed in versions 5.3.18-65.2, 5.3.18-68.1
kernel-devel-rt - addressed in versions 5.3.18-65.2, 5.3.18-68.1
kernel-rt-debugsource - addressed in versions 5.3.18-65.2, 5.3.18-68.1
kernel-rt-debuginfo - addressed in versions 5.3.18-65.2, 5.3.18-68.1
kernel-rt-devel-debuginfo - addressed in versions 5.3.18-65.2, 5.3.18-68.1
kernel-rt_debug - update to 5.3.18-65.2
kernel-rt_debug-debuginfo - addressed in versions 5.3.18-65.2, 5.3.18-68.1
kernel-rt_debug-debugsource - addressed in versions 5.3.18-65.2, 5.3.18-68.1
kernel-rt_debug-devel - addressed in versions 5.3.18-65.2, 5.3.18-68.1
kernel-rt_debug-devel-debuginfo - addressed in versions 5.3.18-65.2, 5.3.18-68.1
ocfs2-kmp-rt - addressed in versions 5.3.18-65.2, 5.3.18-68.1
kernel-rt - addressed in versions 5.3.18-65.2, 5.3.18-68.1
linux-image-virtual (Ubuntu package) - addressed in versions 5.4.0.164.161, 5.13.0.28.38
linux-image-lowlatency (Ubuntu package) - addressed in versions 5.4.0.164.161, 5.13.0.28.38
linux-image-generic-lpae (Ubuntu package) - addressed in versions 5.4.0.164.161, 5.13.0.28.38
linux-image-generic (Ubuntu package) - addressed in versions 5.4.0.164.161, 5.13.0.28.38
linux-image-5.4.0-164-generic-lpae (Ubuntu package) - update to 5.4.0-164.181
linux-image-5.4.0-1023-iot (Ubuntu package) - update to 5.4.0-1023.24
linux-image-xilinx-zynqmp (Ubuntu package) - update to 5.4.0.1031.32
linux-image-5.4.0-1031-xilinx-zynqmp (Ubuntu package) - update to 5.4.0-1031.35
linux-image-ibm-lts-20.04 (Ubuntu package) - update to 5.4.0.1058.87
linux-image-bluefield (Ubuntu package) - update to 5.4.0.1072.67
linux-image-5.4.0-1072-bluefield (Ubuntu package) - update to 5.4.0-1072.78
linux-image-gkeop-5.4 (Ubuntu package) - update to 5.4.0.1078.76
linux-image-gkeop (Ubuntu package) - update to 5.4.0.1078.76
linux-image-5.4.0-1078-gkeop (Ubuntu package) - update to 5.4.0-1078.82
linux-image-raspi (Ubuntu package) - addressed in versions 5.4.0.1095.125, 5.13.0.1016.21
linux-image-raspi2 (Ubuntu package) - update to 5.4.0.1095.125
linux-image-kvm (Ubuntu package) - addressed in versions 5.4.0.1100.95, 5.13.0.1011.11
linux-image-5.4.0-1100-kvm (Ubuntu package) - update to 5.4.0-1100.106
linux-image-oracle-lts-20.04 (Ubuntu package) - update to 5.4.0.1110.103
linux-image-aws-lts-20.04 (Ubuntu package) - update to 5.4.0.1111.108
linux-image-gcp-lts-20.04 (Ubuntu package) - update to 5.4.0.1115.117
linux-image-azure-lts-20.04 (Ubuntu package) - update to 5.4.0.1117.110
linux-image-5.10.0-1053-oem (Ubuntu package) - update to 5.10.0-1053.55
linux-image-oem-20.04 (Ubuntu package) - addressed in versions 5.10.0.1053.55, 5.13.0.28.38
linux-image-oem-20.04b (Ubuntu package) - update to 5.10.0.1053.55
linux-image-5.11.0-1028-oracle (Ubuntu package) - update to 5.11.0-1028.31~20.04.1
linux-image-5.11.0-1028-azure (Ubuntu package) - update to 5.11.0-1028.31~20.04.2
linux-image-5.11.0-1029-gcp (Ubuntu package) - update to 5.11.0-1029.33~20.04.3
linux-image-5.13.0-28-generic-64k (Ubuntu package) - update to 5.13.0-28.31~20.04.1
linux-image-5.13.0-28-generic-lpae (Ubuntu package) - update to 5.13.0-28.31~20.04.1
linux-image-5.13.0-28-lowlatency (Ubuntu package) - update to 5.13.0-28.31~20.04.1
linux-image-5.13.0-28-generic (Ubuntu package) - update to 5.13.0-28.31~20.04.1
linux-image-virtual-hwe-20.04 (Ubuntu package) - update to 5.13.0.28.31~20.04.15
linux-image-lowlatency-hwe-20.04 (Ubuntu package) - update to 5.13.0.28.31~20.04.15
linux-image-generic-lpae-hwe-20.04 (Ubuntu package) - update to 5.13.0.28.31~20.04.15
linux-image-generic-hwe-20.04 (Ubuntu package) - update to 5.13.0.28.31~20.04.15
linux-image-generic-64k-hwe-20.04 (Ubuntu package) - update to 5.13.0.28.31~20.04.15
linux-image-generic-64k (Ubuntu package) - update to 5.13.0.28.38
linux-image-5.13.0-1011-kvm (Ubuntu package) - update to 5.13.0-1011.12
linux-image-5.13.0-1012-aws (Ubuntu package) - update to 5.13.0-1012.13
linux-image-gke (Ubuntu package) - update to 5.13.0.1013.12
linux-image-5.13.0-1013-gcp (Ubuntu package) - update to 5.13.0-1013.16
linux-image-5.13.0-1016-raspi (Ubuntu package) - update to 5.13.0-1016.18
linux-image-5.13.0-1016-raspi-nolpae (Ubuntu package) - update to 5.13.0-1016.18
linux-image-5.13.0-1016-oracle (Ubuntu package) - update to 5.13.0-1016.20
linux-image-raspi-nolpae (Ubuntu package) - update to 5.13.0.1016.21
linux-image-oem-20.04c (Ubuntu package) - update to 5.13.0.1029.31
linux-image-5.13.0-1029-oem (Ubuntu package) - update to 5.13.0-1029.36
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
kernel - addressed in versions 5.15.5-100.fc34, 5.15.5-200.fc35
kernel-livepatch-5_3_18-59_37-default-debuginfo - update to 5-150300.2.1
kernel-livepatch-SLE15-SP3_Update_10-debugsource - update to 5-150300.2.1
kernel-livepatch-5_3_18-59_37-default - update to 5-150300.2.1
kernel-livepatch-5_3_18-59_34-default-debuginfo - update to 6-150300.2.1
kernel-livepatch-5_3_18-59_34-default - update to 6-150300.2.1
kernel-livepatch-SLE15-SP3_Update_9-debugsource - update to 6-150300.2.1
kernel-livepatch-5_3_18-59_27-default-debuginfo - update to 7-150300.2.1
kernel-livepatch-5_3_18-59_27-default - update to 7-150300.2.1
kernel-livepatch-5_3_18-59_24-default-debuginfo - update to 7-150300.2.1
kernel-livepatch-5_3_18-59_24-default - update to 7-150300.2.1
kernel-livepatch-SLE15-SP3_Update_6-debugsource - update to 7-150300.2.1
kernel-livepatch-SLE15-SP3_Update_7-debugsource - update to 7-150300.2.1
kernel-livepatch-SLE15-SP3_Update_5-debugsource - update to 9-150300.2.1
kernel-livepatch-5_3_18-59_19-default-debuginfo - update to 9-150300.2.1
kernel-livepatch-5_3_18-59_19-default - update to 9-150300.2.1

External References

Related Security Bulletins