NULL pointer dereference in Linux kernel - CVE-2021-3739

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Main Vulnerability Database Vulnerabilities #VU90666

NULL pointer dereference in Linux kernel - CVE-2021-3739

Published: June 1, 2024


Vulnerability identifier: #VU90666
CSH Severity: Low
CVSS v4: 6.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-3739
CWE-ID: CWE-476
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a local user to read data or crash the application.

The vulnerability exists due to NULL pointer dereference within the btrfs_rm_device() function in fs/btrfs/volumes.c. A local user can read data or crash the application.


Affected software

Linux kernel
SUSE MicroOS
SUSE Linux Enterprise Module for Realtime
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 Module for Live Patching
SUSE Linux Enterprise Workstation Extension
SUSE Linux Enterprise Module for Public Cloud
Ubuntu
kernel-livepatch-SLE15-SP2_Update_19-debugsource
kernel-livepatch-5_3_18-24_83-default-debuginfo
kernel-livepatch-5_3_18-24_83-default
kernel-livepatch-SLE15-SP3_Update_6-debugsource
kernel-livepatch-5_3_18-59_24-default-debuginfo
kernel-livepatch-5_3_18-59_24-default
kernel-source-azure
kernel-devel-azure
kernel-syms-azure
kernel-azure-debuginfo
kernel-azure
kernel-azure-debugsource
kernel-azure-devel
kernel-azure-devel-debuginfo
kernel-macros
kernel-source
kernel-devel
kernel-syms
kernel-preempt-debugsource
kernel-obs-build
kernel-obs-build-debugsource
kernel-preempt-debuginfo
ocfs2-kmp-default-debuginfo
reiserfs-kmp-default-debuginfo
reiserfs-kmp-default
kernel-default-livepatch-devel
kernel-default-livepatch
kernel-preempt-extra-debuginfo
kernel-preempt-extra
kernel-default-extra-debuginfo
kernel-default-extra
kernel-default-debugsource
kernel-default-debuginfo
kernel-default
ocfs2-kmp-default
gfs2-kmp-default-debuginfo
gfs2-kmp-default
dlm-kmp-default-debuginfo
dlm-kmp-default
cluster-md-kmp-default-debuginfo
kernel-preempt-devel
kernel-preempt-devel-debuginfo
cluster-md-kmp-default
kernel-docs
kernel-default-devel
kernel-default-devel-debuginfo
kernel-preempt
kernel-default-base
kernel-syms-rt
kernel-source-rt
kernel-devel-rt
kernel-rt-debuginfo
ocfs2-kmp-rt-debuginfo
kernel-rt
kernel-rt-debugsource
cluster-md-kmp-rt
cluster-md-kmp-rt-debuginfo
dlm-kmp-rt
dlm-kmp-rt-debuginfo
gfs2-kmp-rt
gfs2-kmp-rt-debuginfo
kernel-rt-devel
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-zfcpdump
kernel-64kb
kernel-64kb-debuginfo
kernel-64kb-debugsource
kernel-64kb-devel
kernel-64kb-devel-debuginfo
kernel-zfcpdump-debuginfo
kernel-zfcpdump-debugsource
linux-image-virtual (Ubuntu package)
linux-image-generic (Ubuntu package)
linux-image-oem (Ubuntu package)
linux-image-oem-osp1 (Ubuntu package)
linux-image-lowlatency (Ubuntu package)
linux-image-generic-lpae (Ubuntu package)
linux-image-5.4.0-90-lowlatency (Ubuntu package)
linux-image-5.4.0-90-generic-lpae (Ubuntu package)
linux-image-5.4.0-90-generic (Ubuntu package)
linux-image-lowlatency-hwe-18.04 (Ubuntu package)
linux-image-virtual-hwe-18.04 (Ubuntu package)
linux-image-generic-hwe-18.04 (Ubuntu package)
linux-image-snapdragon-hwe-18.04 (Ubuntu package)
linux-image-generic-lpae-hwe-18.04 (Ubuntu package)
linux-image-ibm-lts-20.04 (Ubuntu package)
linux-image-5.4.0-1007-ibm (Ubuntu package)
linux-image-ibm (Ubuntu package)
linux-image-bluefield (Ubuntu package)
linux-image-5.4.0-1021-bluefield (Ubuntu package)
linux-image-5.4.0-1026-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-5.4.0-1046-raspi (Ubuntu package)
linux-image-raspi2 (Ubuntu package)
linux-image-raspi (Ubuntu package)
linux-image-kvm (Ubuntu package)
linux-image-5.4.0-1049-kvm (Ubuntu package)
linux-image-5.4.0-1055-gke (Ubuntu package)
linux-image-gke-5.4 (Ubuntu package)
linux-image-gke (Ubuntu package)
linux-image-gcp (Ubuntu package)
linux-image-oracle-lts-20.04 (Ubuntu package)
linux-image-5.4.0-1057-oracle (Ubuntu package)
linux-image-5.4.0-1057-gcp (Ubuntu package)
linux-image-oracle (Ubuntu package)
linux-image-gcp-lts-20.04 (Ubuntu package)
linux-image-aws (Ubuntu package)
linux-image-5.4.0-1059-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-5.4.0-1063-azure (Ubuntu package)
linux-image-oem-20.04c (Ubuntu package)
linux-image-5.13.0-1017-oem (Ubuntu package)

How to mitigate CVE-2021-3739

Install update from vendor's website.

kernel-livepatch-SLE15-SP2_Update_19-debugsource - update to 1-5.3.4
kernel-livepatch-5_3_18-24_83-default-debuginfo - update to 1-5.3.4
kernel-livepatch-5_3_18-24_83-default - update to 1-5.3.4
kernel-livepatch-SLE15-SP3_Update_6-debugsource - update to 1-7.5.1
kernel-livepatch-5_3_18-59_24-default-debuginfo - update to 1-7.5.1
kernel-livepatch-5_3_18-59_24-default - update to 1-7.5.1
kernel-source-azure - addressed in versions 5.3.18-18.66.1, 5.3.18-38.22.1
kernel-devel-azure - addressed in versions 5.3.18-18.66.1, 5.3.18-38.22.1
kernel-syms-azure - addressed in versions 5.3.18-18.66.1, 5.3.18-38.22.1
kernel-azure-debuginfo - addressed in versions 5.3.18-18.66.2, 5.3.18-38.22.2
kernel-azure - addressed in versions 5.3.18-18.66.2, 5.3.18-38.22.2
kernel-azure-debugsource - addressed in versions 5.3.18-18.66.2, 5.3.18-38.22.2
kernel-azure-devel - addressed in versions 5.3.18-18.66.2, 5.3.18-38.22.2
kernel-azure-devel-debuginfo - addressed in versions 5.3.18-18.66.2, 5.3.18-38.22.2
kernel-macros - addressed in versions 5.3.18-24.83.1, 5.3.18-59.24.1
kernel-source - addressed in versions 5.3.18-24.83.1, 5.3.18-59.24.1
kernel-devel - addressed in versions 5.3.18-24.83.1, 5.3.18-59.24.1
kernel-syms - addressed in versions 5.3.18-24.83.1, 5.3.18-59.24.1
kernel-preempt-debugsource - addressed in versions 5.3.18-24.83.2, 5.3.18-59.24.1
kernel-obs-build - addressed in versions 5.3.18-24.83.2, 5.3.18-59.24.1
kernel-obs-build-debugsource - addressed in versions 5.3.18-24.83.2, 5.3.18-59.24.1
kernel-preempt-debuginfo - addressed in versions 5.3.18-24.83.2, 5.3.18-59.24.1
ocfs2-kmp-default-debuginfo - addressed in versions 5.3.18-24.83.2, 5.3.18-59.24.1
reiserfs-kmp-default-debuginfo - addressed in versions 5.3.18-24.83.2, 5.3.18-59.24.1
reiserfs-kmp-default - addressed in versions 5.3.18-24.83.2, 5.3.18-59.24.1
kernel-default-livepatch-devel - addressed in versions 5.3.18-24.83.2, 5.3.18-59.24.1
kernel-default-livepatch - addressed in versions 5.3.18-24.83.2, 5.3.18-59.24.1
kernel-preempt-extra-debuginfo - addressed in versions 5.3.18-24.83.2, 5.3.18-59.24.1
kernel-preempt-extra - addressed in versions 5.3.18-24.83.2, 5.3.18-59.24.1
kernel-default-extra-debuginfo - addressed in versions 5.3.18-24.83.2, 5.3.18-59.24.1
kernel-default-extra - addressed in versions 5.3.18-24.83.2, 5.3.18-59.24.1
kernel-default-debugsource - addressed in versions 5.3.18-24.83.2, 5.3.18-59.24.1
kernel-default-debuginfo - addressed in versions 5.3.18-24.83.2, 5.3.18-59.24.1
kernel-default - addressed in versions 5.3.18-24.83.2, 5.3.18-59.24.1
ocfs2-kmp-default - addressed in versions 5.3.18-24.83.2, 5.3.18-59.24.1
gfs2-kmp-default-debuginfo - addressed in versions 5.3.18-24.83.2, 5.3.18-59.24.1
gfs2-kmp-default - addressed in versions 5.3.18-24.83.2, 5.3.18-59.24.1
dlm-kmp-default-debuginfo - addressed in versions 5.3.18-24.83.2, 5.3.18-59.24.1
dlm-kmp-default - addressed in versions 5.3.18-24.83.2, 5.3.18-59.24.1
cluster-md-kmp-default-debuginfo - addressed in versions 5.3.18-24.83.2, 5.3.18-59.24.1
kernel-preempt-devel - addressed in versions 5.3.18-24.83.2, 5.3.18-59.24.1
kernel-preempt-devel-debuginfo - addressed in versions 5.3.18-24.83.2, 5.3.18-59.24.1
cluster-md-kmp-default - addressed in versions 5.3.18-24.83.2, 5.3.18-59.24.1
kernel-docs - addressed in versions 5.3.18-24.83.2, 5.3.18-59.24.1
kernel-default-devel - addressed in versions 5.3.18-24.83.2, 5.3.18-59.24.1
kernel-default-devel-debuginfo - addressed in versions 5.3.18-24.83.2, 5.3.18-59.24.1
kernel-preempt - addressed in versions 5.3.18-24.83.2, 5.3.18-59.24.1
kernel-default-base - addressed in versions 5.3.18-24.83.2.9.38.3, 5.3.18-59.24.1.18.12.1
kernel-syms-rt - addressed in versions 5.3.18-51.1, 5.3.18-57.1
kernel-source-rt - addressed in versions 5.3.18-51.1, 5.3.18-57.1
kernel-devel-rt - addressed in versions 5.3.18-51.1, 5.3.18-57.1
kernel-rt-debuginfo - addressed in versions 5.3.18-51.2, 5.3.18-57.1
ocfs2-kmp-rt-debuginfo - addressed in versions 5.3.18-51.2, 5.3.18-57.1
kernel-rt - addressed in versions 5.3.18-51.2, 5.3.18-57.1
kernel-rt-debugsource - addressed in versions 5.3.18-51.2, 5.3.18-57.1
cluster-md-kmp-rt - addressed in versions 5.3.18-51.2, 5.3.18-57.1
cluster-md-kmp-rt-debuginfo - addressed in versions 5.3.18-51.2, 5.3.18-57.1
dlm-kmp-rt - addressed in versions 5.3.18-51.2, 5.3.18-57.1
dlm-kmp-rt-debuginfo - addressed in versions 5.3.18-51.2, 5.3.18-57.1
gfs2-kmp-rt - addressed in versions 5.3.18-51.2, 5.3.18-57.1
gfs2-kmp-rt-debuginfo - addressed in versions 5.3.18-51.2, 5.3.18-57.1
kernel-rt-devel - addressed in versions 5.3.18-51.2, 5.3.18-57.1
kernel-rt-devel-debuginfo - addressed in versions 5.3.18-51.2, 5.3.18-57.1
kernel-rt_debug - update to 5.3.18-51.2
kernel-rt_debug-debuginfo - addressed in versions 5.3.18-51.2, 5.3.18-57.1
kernel-rt_debug-debugsource - addressed in versions 5.3.18-51.2, 5.3.18-57.1
kernel-rt_debug-devel - addressed in versions 5.3.18-51.2, 5.3.18-57.1
kernel-rt_debug-devel-debuginfo - addressed in versions 5.3.18-51.2, 5.3.18-57.1
ocfs2-kmp-rt - addressed in versions 5.3.18-51.2, 5.3.18-57.1
kernel-zfcpdump - update to 5.3.18-59.24.1
kernel-64kb - update to 5.3.18-59.24.1
kernel-64kb-debuginfo - update to 5.3.18-59.24.1
kernel-64kb-debugsource - update to 5.3.18-59.24.1
kernel-64kb-devel - update to 5.3.18-59.24.1
kernel-64kb-devel-debuginfo - update to 5.3.18-59.24.1
kernel-zfcpdump-debuginfo - update to 5.3.18-59.24.1
kernel-zfcpdump-debugsource - update to 5.3.18-59.24.1
linux-image-virtual (Ubuntu package) - update to 5.4.0.90.94
linux-image-generic (Ubuntu package) - update to 5.4.0.90.94
linux-image-oem (Ubuntu package) - addressed in versions 5.4.0.90.94, 5.4.0.90.101~18.04.80
linux-image-oem-osp1 (Ubuntu package) - addressed in versions 5.4.0.90.94, 5.4.0.90.101~18.04.80
linux-image-lowlatency (Ubuntu package) - update to 5.4.0.90.94
linux-image-generic-lpae (Ubuntu package) - update to 5.4.0.90.94
linux-image-5.4.0-90-lowlatency (Ubuntu package) - addressed in versions 5.4.0-90.101, 5.4.0-90.101~18.04.1
linux-image-5.4.0-90-generic-lpae (Ubuntu package) - addressed in versions 5.4.0-90.101, 5.4.0-90.101~18.04.1
linux-image-5.4.0-90-generic (Ubuntu package) - addressed in versions 5.4.0-90.101, 5.4.0-90.101~18.04.1
linux-image-lowlatency-hwe-18.04 (Ubuntu package) - update to 5.4.0.90.101~18.04.80
linux-image-virtual-hwe-18.04 (Ubuntu package) - update to 5.4.0.90.101~18.04.80
linux-image-generic-hwe-18.04 (Ubuntu package) - update to 5.4.0.90.101~18.04.80
linux-image-snapdragon-hwe-18.04 (Ubuntu package) - update to 5.4.0.90.101~18.04.80
linux-image-generic-lpae-hwe-18.04 (Ubuntu package) - update to 5.4.0.90.101~18.04.80
linux-image-ibm-lts-20.04 (Ubuntu package) - update to 5.4.0.1007.8
linux-image-5.4.0-1007-ibm (Ubuntu package) - update to 5.4.0-1007.8
linux-image-ibm (Ubuntu package) - update to 5.4.0.1007.8
linux-image-bluefield (Ubuntu package) - update to 5.4.0.1021.22
linux-image-5.4.0-1021-bluefield (Ubuntu package) - update to 5.4.0-1021.24
linux-image-5.4.0-1026-gkeop (Ubuntu package) - addressed in versions 5.4.0-1026.27, 5.4.0-1026.27~18.04.1
linux-image-gkeop-5.4 (Ubuntu package) - addressed in versions 5.4.0.1026.27~18.04.27, 5.4.0.1026.29
linux-image-gkeop (Ubuntu package) - update to 5.4.0.1026.29
linux-image-raspi-hwe-18.04 (Ubuntu package) - update to 5.4.0.1046.49
linux-image-5.4.0-1046-raspi (Ubuntu package) - addressed in versions 5.4.0-1046.50, 5.4.0-1046.50~18.04.1
linux-image-raspi2 (Ubuntu package) - update to 5.4.0.1046.81
linux-image-raspi (Ubuntu package) - update to 5.4.0.1046.81
linux-image-kvm (Ubuntu package) - update to 5.4.0.1049.48
linux-image-5.4.0-1049-kvm (Ubuntu package) - update to 5.4.0-1049.51
linux-image-5.4.0-1055-gke (Ubuntu package) - addressed in versions 5.4.0-1055.58, 5.4.0-1055.58~18.04.1
linux-image-gke-5.4 (Ubuntu package) - addressed in versions 5.4.0.1055.58~18.04.20, 5.4.0.1055.65
linux-image-gke (Ubuntu package) - update to 5.4.0.1055.65
linux-image-gcp (Ubuntu package) - update to 5.4.0.1057.43
linux-image-oracle-lts-20.04 (Ubuntu package) - update to 5.4.0.1057.57
linux-image-5.4.0-1057-oracle (Ubuntu package) - addressed in versions 5.4.0-1057.61, 5.4.0-1057.61~18.04.1
linux-image-5.4.0-1057-gcp (Ubuntu package) - addressed in versions 5.4.0-1057.61, 5.4.0-1057.61~18.04.1
linux-image-oracle (Ubuntu package) - update to 5.4.0.1057.61~18.04.37
linux-image-gcp-lts-20.04 (Ubuntu package) - update to 5.4.0.1057.67
linux-image-aws (Ubuntu package) - update to 5.4.0.1059.42
linux-image-5.4.0-1059-aws (Ubuntu package) - addressed in versions 5.4.0-1059.62, 5.4.0-1059.62~18.04.1
linux-image-aws-lts-20.04 (Ubuntu package) - update to 5.4.0.1059.62
linux-image-azure (Ubuntu package) - update to 5.4.0.1063.43
linux-image-azure-lts-20.04 (Ubuntu package) - update to 5.4.0.1063.61
linux-image-5.4.0-1063-azure (Ubuntu package) - addressed in versions 5.4.0-1063.66, 5.4.0-1063.66~18.04.1
linux-image-oem-20.04c (Ubuntu package) - update to 5.13.0.1017.21
linux-image-5.13.0-1017-oem (Ubuntu package) - update to 5.13.0-1017.21

External References

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