NULL pointer dereference in Linux kernel - CVE-2021-44879

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Main Vulnerability Database Vulnerabilities #VU62483

NULL pointer dereference in Linux kernel - CVE-2021-44879

Published: April 21, 2022


Vulnerability identifier: #VU62483
CSH Severity: Low
CVSS v4.0: 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-2021-44879
CWE-ID: CWE-476
Exploitation vector: Local access
Exploit availability: No public exploit available
Affected software:
Linux kernel
Debian Linux
SUSE Manager Proxy
SUSE Manager Retail Branch Server
SUSE Manager Server
SUSE Linux Enterprise Micro
Anolis OS
SUSE Linux Enterprise Server
SUSE Linux Enterprise Server for SAP Applications
SUSE Linux Enterprise Module for Realtime
SUSE Linux Enterprise Real Time
SUSE Linux Enterprise High Performance Computing
SUSE Linux Enterprise Module for Public Cloud
SUSE Linux Enterprise High Availability
SUSE Linux Enterprise Workstation Extension
SUSE Linux Enterprise Module for Legacy Software
SUSE Linux Enterprise Module for Development Tools
SUSE Linux Enterprise Module for Basesystem
SUSE Linux Enterprise Desktop
SUSE Linux Enterprise Module for Live Patching
openSUSE Leap
Ubuntu
openEuler
Dell Secure Connect Gateway
RecoverPoint for Virtual Machines
SmartFabric OS10
linux-image-snapdragon-hwe-18.04 (Ubuntu package)
linux-image-oracle (Ubuntu package)
linux-image-5.4.0-1120-aws (Ubuntu package)
linux-image-aws (Ubuntu package)
linux-image-5.4.0-1126-azure (Ubuntu package)
linux-image-azure (Ubuntu package)
linux-image-5.4.0-1067-ibm (Ubuntu package)
linux-image-raspi-hwe-18.04 (Ubuntu package)
linux-image-5.4.0-1104-raspi (Ubuntu package)
linux-image-virtual-hwe-18.04 (Ubuntu package)
linux-image-lowlatency-hwe-18.04 (Ubuntu package)
linux-image-generic-hwe-18.04 (Ubuntu package)
linux-image-gcp (Ubuntu package)
linux-image-oem-osp1 (Ubuntu package)
linux-image-oem (Ubuntu package)
linux-image-5.4.0-1119-oracle (Ubuntu package)
linux-image-5.4.0-173-lowlatency (Ubuntu package)
linux-image-5.4.0-173-generic (Ubuntu package)
linux-image-5.4.0-1124-gcp (Ubuntu package)
linux-image-ibm (Ubuntu package)
kernel-livepatch-5_14_21-150400_24_11-default
kernel-livepatch-5_14_21-150400_24_11-default-debuginfo
kernel-livepatch-SLE15-SP4_Update_1-debugsource
kernel-debuginfo
perf-debuginfo
kernel-tools-debuginfo
python2-perf
kernel-debugsource
kernel-devel
kernel-source
perf
python2-perf-debuginfo
kernel-tools
kernel-tools-devel
bpftool
kernel
python3-perf
python3-perf-debuginfo
bpftool-debuginfo
kernel-tools-libs-devel
kernel-tools-libs
kernel-modules-internal
kernel-modules-extra
kernel-modules
kernel-headers
kernel-debug-modules-extra
kernel-debug-modules
kernel-debug-devel
kernel-debug-core
kernel-debug
kernel-core
python-perf
kernel-syms-rt
gfs2-kmp-rt
ocfs2-kmp-rt-debuginfo
ocfs2-kmp-rt
kernel-rt_debug-devel-debuginfo
kernel-rt_debug-devel
kernel-rt_debug-debugsource
kernel-rt_debug-debuginfo
kernel-rt_debug
kernel-rt-devel-debuginfo
kernel-rt-devel
kernel-rt-debuginfo
kernel-rt-debugsource
kernel-devel-rt
kernel-source-rt
cluster-md-kmp-rt
cluster-md-kmp-rt-debuginfo
dlm-kmp-rt-debuginfo
dlm-kmp-rt
gfs2-kmp-rt-debuginfo
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-5.4.0-173-generic-lpae (Ubuntu package)
linux-image-5.4.0-1032-iot (Ubuntu package)
linux-image-xilinx-zynqmp (Ubuntu package)
linux-image-5.4.0-1039-xilinx-zynqmp (Ubuntu package)
linux-image-ibm-lts-20.04 (Ubuntu package)
linux-image-bluefield (Ubuntu package)
linux-image-5.4.0-1080-bluefield (Ubuntu package)
linux-image-gkeop (Ubuntu package)
linux-image-gkeop-5.4 (Ubuntu package)
linux-image-5.4.0-1087-gkeop (Ubuntu package)
linux-image-raspi2 (Ubuntu package)
linux-image-raspi (Ubuntu package)
linux-image-kvm (Ubuntu package)
linux-image-5.4.0-1108-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 (Debian package)
linux-image-5.13.0-40-generic-lpae (Ubuntu package)
linux-image-5.13.0-40-generic (Ubuntu package)
linux-image-5.13.0-40-lowlatency (Ubuntu package)
linux-image-5.13.0-40-generic-64k (Ubuntu package)
linux-image-generic-64k-hwe-20.04 (Ubuntu package)
linux-image-generic-lpae-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-oem-20.04 (Ubuntu package)
linux-image-generic-64k (Ubuntu package)
linux-image-5.13.0-1021-kvm (Ubuntu package)
linux-image-5.13.0-1022-aws (Ubuntu package)
linux-image-5.13.0-1022-azure (Ubuntu package)
linux-image-gke (Ubuntu package)
linux-image-5.13.0-1024-gcp (Ubuntu package)
linux-image-5.13.0-1025-raspi-nolpae (Ubuntu package)
linux-image-5.13.0-1025-raspi (Ubuntu package)
linux-image-raspi-nolpae (Ubuntu package)
linux-image-5.13.0-1027-oracle (Ubuntu package)
linux-image-oem-20.04c (Ubuntu package)
linux-image-oem-20.04b (Ubuntu package)
linux-image-oem-20.04d (Ubuntu package)
linux-image-5.14.0-1024-oem (Ubuntu package)
ocfs2-kmp-azure-debuginfo
cluster-md-kmp-azure
cluster-md-kmp-azure-debuginfo
dlm-kmp-azure
dlm-kmp-azure-debuginfo
gfs2-kmp-azure
gfs2-kmp-azure-debuginfo
kernel-azure
kernel-azure-debuginfo
kernel-azure-debugsource
kernel-azure-devel
kernel-azure-extra
kernel-source-azure
kernel-devel-azure
reiserfs-kmp-azure-debuginfo
reiserfs-kmp-azure
kernel-azure-devel-debuginfo
ocfs2-kmp-azure
kselftests-kmp-azure-debuginfo
kselftests-kmp-azure
kernel-syms-azure
kernel-azure-optional-debuginfo
kernel-azure-optional
kernel-azure-livepatch-devel
kernel-azure-extra-debuginfo
kernel-64kb-livepatch-devel
kernel-64kb-optional
kernel-64kb-optional-debuginfo
kernel-64kb-extra-debuginfo
kselftests-kmp-64kb
kselftests-kmp-64kb-debuginfo
ocfs2-kmp-64kb
ocfs2-kmp-64kb-debuginfo
reiserfs-kmp-64kb
reiserfs-kmp-64kb-debuginfo
kernel-docs
kernel-docs-html
kernel-macros
kernel-source-vanilla
kernel-zfcpdump
kernel-zfcpdump-debuginfo
kernel-zfcpdump-debugsource
kernel-64kb-debuginfo
kernel-kvmsmall
kernel-obs-build-debugsource
kernel-obs-qa
kernel-syms
kselftests-kmp-default
kselftests-kmp-default-debuginfo
ocfs2-kmp-default
ocfs2-kmp-default-debuginfo
reiserfs-kmp-default
reiserfs-kmp-default-debuginfo
kernel-obs-build
kernel-kvmsmall-debuginfo
kernel-kvmsmall-debugsource
kernel-kvmsmall-devel
kernel-kvmsmall-devel-debuginfo
kernel-kvmsmall-livepatch-devel
kernel-debug-debuginfo
kernel-debug-debugsource
kernel-default-debugsource
cluster-md-kmp-default
cluster-md-kmp-default-debuginfo
dlm-kmp-default
dlm-kmp-default-debuginfo
gfs2-kmp-default
gfs2-kmp-default-debuginfo
kernel-default
kernel-default-debuginfo
kernel-64kb-devel-debuginfo
kernel-default-devel
kernel-default-devel-debuginfo
kernel-default-extra
kernel-default-extra-debuginfo
kernel-default-livepatch
kernel-default-livepatch-devel
kernel-default-optional
kernel-default-optional-debuginfo
dtb-socionext
dtb-hisilicon
dtb-lg
dtb-marvell
dtb-mediatek
dtb-nvidia
dtb-qcom
dtb-renesas
dtb-rockchip
kernel-debug-devel-debuginfo
dtb-sprd
dtb-xilinx
gfs2-kmp-64kb
gfs2-kmp-64kb-debuginfo
kernel-64kb
kernel-64kb-debugsource
kernel-64kb-devel
kernel-64kb-extra
dtb-amazon
kernel-debug-livepatch-devel
cluster-md-kmp-64kb
cluster-md-kmp-64kb-debuginfo
dlm-kmp-64kb
dlm-kmp-64kb-debuginfo
dtb-allwinner
dtb-freescale
dtb-altera
dtb-amd
dtb-amlogic
dtb-apm
dtb-apple
dtb-arm
dtb-broadcom
dtb-cavium
dtb-exynos
kernel-default-base-rebuild
kernel-default-base

Detailed vulnerability description

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

The vulnerability exists due to a NULL pointer dereference error in the gc_data_segment() function in fs/f2fs/gc.c. A local user can mount a specially crafted f2fs image, trigger a NULL pointer dereference and perform a denial of service (DoS) attack.


How to mitigate CVE-2021-44879

Install update from vendor's website.

Sources