Buffer overflow in Linux kernel - CVE-2021-47117

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Main Vulnerability Database Vulnerabilities #VU93162

Buffer overflow in Linux kernel - CVE-2021-47117

Published: June 24, 2024 / Updated: May 13, 2025


Vulnerability identifier: #VU93162
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-2021-47117
CWE-ID: CWE-119
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

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

The vulnerability exists due to memory corruption within the ext4_split_extent_at() function in fs/ext4/extents.c. A local user can perform a denial of service (DoS) attack.


Affected software

Linux kernel
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise High Availability Extension 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise High Performance Computing LTSS 15
SUSE Linux Enterprise High Performance Computing 12
SUSE Linux Enterprise Real Time 12
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise High Availability Extension 12
SUSE Linux Enterprise Server for SAP Applications 12
SUSE Linux Enterprise Software Development Kit 12
SUSE Manager Server
SUSE Manager Retail Branch Server
SUSE Manager Proxy
SUSE Linux Enterprise Micro
SUSE Linux Enterprise Micro for Rancher
SUSE Enterprise Storage
SUSE Linux Enterprise Workstation Extension 12
SUSE Linux Enterprise Live Patching
Ubuntu
SUSE Linux Enterprise Server 15 SP2 LTSS
SUSE Linux Enterprise Server 15 SP2 Business Critical Linux
SUSE Linux Enterprise High Performance Computing 15 SP2 LTSS
SUSE Linux Enterprise Server 15 SP3 Business Critical Linux
SUSE Linux Enterprise Server 15 SP3 LTSS
openSUSE Leap
Dell Data Protection Central
PowerProtect DP Series Appliance (IDPA)
kgraft-patch-4_12_14-122_212-default
kernel-livepatch-5_3_18-150200_24_188-default
kernel-livepatch-SLE15-SP2_Update_47-debugsource
kernel-livepatch-5_3_18-150200_24_188-default-debuginfo
kernel-livepatch-5_3_18-150300_59_158-default-debuginfo
kernel-livepatch-5_3_18-150300_59_158-default
kernel-livepatch-5_3_18-150300_59_158-preempt
kernel-livepatch-5_3_18-150300_59_158-preempt-debuginfo
kernel-livepatch-SLE15-SP3_Update_43-debugsource
linux-aws (Ubuntu package)
kernel-rt_debug
kernel-source-rt
kernel-rt
kernel-devel-rt
kernel-rt_debug-devel
kernel-rt_debug-devel-debuginfo
ocfs2-kmp-rt-debuginfo
dlm-kmp-rt-debuginfo
kernel-rt-debuginfo
kernel-rt-debugsource
cluster-md-kmp-rt
gfs2-kmp-rt
kernel-rt-devel
cluster-md-kmp-rt-debuginfo
kernel-rt_debug-debuginfo
ocfs2-kmp-rt
kernel-rt_debug-debugsource
kernel-syms-rt
kernel-rt-devel-debuginfo
kernel-rt-base-debuginfo
kernel-rt-base
gfs2-kmp-rt-debuginfo
dlm-kmp-rt
kernel-azure
kernel-azure-base-debuginfo
kernel-syms-azure
kernel-azure-debuginfo
kernel-azure-debugsource
kernel-azure-devel
kernel-azure-base
kernel-devel-azure
kernel-source-azure
kernel-default
kernel-default-base-debuginfo
dlm-kmp-default-debuginfo
gfs2-kmp-default
gfs2-kmp-default-debuginfo
kernel-default-debugsource
ocfs2-kmp-default-debuginfo
dlm-kmp-default
kernel-default-devel
kernel-default-base
kernel-syms
ocfs2-kmp-default
cluster-md-kmp-default-debuginfo
cluster-md-kmp-default
kernel-macros
kernel-source
kernel-devel
kernel-default-devel-debuginfo
kernel-default-kgraft-devel
kernel-default-kgraft
kernel-docs
kernel-obs-build
kernel-obs-build-debugsource
kernel-default-man
kernel-default-extra
kernel-default-extra-debuginfo
kernel-default-debuginfo
kernel-default-livepatch-devel
reiserfs-kmp-default-debuginfo
reiserfs-kmp-default
kernel-preempt-debuginfo
kernel-preempt-devel
kernel-preempt-debugsource
kernel-preempt
kernel-preempt-devel-debuginfo
kernel-default-livepatch
kernel-kvmsmall-livepatch-devel
kernel-kvmsmall-devel
kernel-debug-devel
kernel-debug-livepatch-devel
kernel-debug-debuginfo
kernel-debug
kernel-kvmsmall
kernel-source-vanilla
kernel-docs-html
kernel-64kb-debuginfo
kernel-64kb-devel-debuginfo
kernel-kvmsmall-debuginfo
kernel-debug-devel-debuginfo
kernel-kvmsmall-debugsource
kernel-debug-debugsource
kernel-kvmsmall-devel-debuginfo
kselftests-kmp-default
reiserfs-kmp-preempt
kernel-64kb-debugsource
kernel-64kb
kernel-64kb-devel
dtb-amd
dtb-sprd
dtb-renesas
dtb-freescale
kselftests-kmp-64kb
dtb-allwinner
dtb-hisilicon
gfs2-kmp-64kb-debuginfo
dtb-lg
dtb-altera
dtb-qcom
dtb-exynos
dtb-xilinx
kselftests-kmp-64kb-debuginfo
dtb-al
dtb-broadcom
cluster-md-kmp-64kb
reiserfs-kmp-64kb-debuginfo
kernel-64kb-optional-debuginfo
gfs2-kmp-preempt
cluster-md-kmp-preempt-debuginfo
kernel-preempt-extra
gfs2-kmp-preempt-debuginfo
kernel-preempt-extra-debuginfo
ocfs2-kmp-preempt
kernel-preempt-optional-debuginfo
kselftests-kmp-preempt
reiserfs-kmp-preempt-debuginfo
kernel-preempt-livepatch-devel
cluster-md-kmp-preempt
ocfs2-kmp-preempt-debuginfo
kselftests-kmp-preempt-debuginfo
kernel-zfcpdump
kernel-zfcpdump-debuginfo
kernel-zfcpdump-debugsource
dtb-aarch64
cluster-md-kmp-64kb-debuginfo
dlm-kmp-64kb
dtb-apm
dtb-nvidia
dtb-amlogic
dlm-kmp-preempt
kernel-preempt-optional
dlm-kmp-preempt-debuginfo
ocfs2-kmp-64kb-debuginfo
kernel-obs-qa
kernel-default-optional-debuginfo
kernel-default-optional
kselftests-kmp-default-debuginfo
reiserfs-kmp-64kb
dtb-mediatek
ocfs2-kmp-64kb
kernel-64kb-extra-debuginfo
dtb-marvell
gfs2-kmp-64kb
dtb-cavium
dtb-zte
dlm-kmp-64kb-debuginfo
kernel-64kb-livepatch-devel
kernel-64kb-optional
dtb-arm
kernel-64kb-extra
dtb-rockchip
dtb-socionext
kernel-default-base-rebuild

How to mitigate CVE-2021-47117

Install update from vendor's website.

Linux kernel - addressed in versions 4.4.272, 4.9.272, 4.14.236, 4.19.194, 5.4.125, 5.10.43, 5.12.10, 5.13
kgraft-patch-4_12_14-122_212-default - update to 1-8.11.1
kernel-livepatch-5_3_18-150200_24_188-default - update to 1-150200.5.3.3
kernel-livepatch-SLE15-SP2_Update_47-debugsource - update to 1-150200.5.3.3
kernel-livepatch-5_3_18-150200_24_188-default-debuginfo - update to 1-150200.5.3.3
kernel-livepatch-5_3_18-150300_59_158-default-debuginfo - update to 1-150300.7.3.5
kernel-livepatch-5_3_18-150300_59_158-default - update to 1-150300.7.3.5
kernel-livepatch-5_3_18-150300_59_158-preempt - update to 1-150300.7.3.5
kernel-livepatch-5_3_18-150300_59_158-preempt-debuginfo - update to 1-150300.7.3.5
kernel-livepatch-SLE15-SP3_Update_43-debugsource - update to 1-150300.7.3.5
linux-aws (Ubuntu package) - addressed in versions 4.4.0-283.317~14.04.1, 4.4.0.1126.128, 4.4.0-1126.133, 4.4.0.1156.153, 4.4.0-1156.162
kernel-rt_debug - update to 4.12.14-10.182.1
kernel-source-rt - addressed in versions 4.12.14-10.182.1, 5.3.18-150300.166.1
kernel-rt - addressed in versions 4.12.14-10.182.1, 5.3.18-150300.166.1
kernel-devel-rt - update to 4.12.14-10.182.1
kernel-rt_debug-devel - update to 4.12.14-10.182.1
kernel-rt_debug-devel-debuginfo - update to 4.12.14-10.182.1
ocfs2-kmp-rt-debuginfo - update to 4.12.14-10.182.1
dlm-kmp-rt-debuginfo - update to 4.12.14-10.182.1
kernel-rt-debuginfo - addressed in versions 4.12.14-10.182.1, 5.3.18-150300.166.1
kernel-rt-debugsource - addressed in versions 4.12.14-10.182.1, 5.3.18-150300.166.1
cluster-md-kmp-rt - update to 4.12.14-10.182.1
gfs2-kmp-rt - update to 4.12.14-10.182.1
kernel-rt-devel - update to 4.12.14-10.182.1
cluster-md-kmp-rt-debuginfo - update to 4.12.14-10.182.1
kernel-rt_debug-debuginfo - update to 4.12.14-10.182.1
ocfs2-kmp-rt - update to 4.12.14-10.182.1
kernel-rt_debug-debugsource - update to 4.12.14-10.182.1
kernel-syms-rt - update to 4.12.14-10.182.1
kernel-rt-devel-debuginfo - update to 4.12.14-10.182.1
kernel-rt-base-debuginfo - update to 4.12.14-10.182.1
kernel-rt-base - update to 4.12.14-10.182.1
gfs2-kmp-rt-debuginfo - update to 4.12.14-10.182.1
dlm-kmp-rt - update to 4.12.14-10.182.1
kernel-azure - update to 4.12.14-16.182.1
kernel-azure-base-debuginfo - update to 4.12.14-16.182.1
kernel-syms-azure - update to 4.12.14-16.182.1
kernel-azure-debuginfo - update to 4.12.14-16.182.1
kernel-azure-debugsource - update to 4.12.14-16.182.1
kernel-azure-devel - update to 4.12.14-16.182.1
kernel-azure-base - update to 4.12.14-16.182.1
kernel-devel-azure - update to 4.12.14-16.182.1
kernel-source-azure - update to 4.12.14-16.182.1
kernel-default - addressed in versions 4.12.14-122.212.1, 5.3.18-150200.24.188.1, 5.3.18-150300.59.158.1
kernel-default-base-debuginfo - update to 4.12.14-122.212.1
dlm-kmp-default-debuginfo - addressed in versions 4.12.14-122.212.1, 5.3.18-150200.24.188.1, 5.3.18-150300.59.158.1
gfs2-kmp-default - addressed in versions 4.12.14-122.212.1, 5.3.18-150200.24.188.1, 5.3.18-150300.59.158.1
gfs2-kmp-default-debuginfo - addressed in versions 4.12.14-122.212.1, 5.3.18-150200.24.188.1, 5.3.18-150300.59.158.1
kernel-default-debugsource - addressed in versions 4.12.14-122.212.1, 5.3.18-150200.24.188.1, 5.3.18-150300.59.158.1
ocfs2-kmp-default-debuginfo - addressed in versions 4.12.14-122.212.1, 5.3.18-150200.24.188.1, 5.3.18-150300.59.158.1
dlm-kmp-default - addressed in versions 4.12.14-122.212.1, 5.3.18-150200.24.188.1, 5.3.18-150300.59.158.1
kernel-default-devel - addressed in versions 4.12.14-122.212.1, 5.3.18-150200.24.188.1, 5.3.18-150300.59.158.1
kernel-default-base - addressed in versions 4.12.14-122.212.1, 5.3.18-150200.24.188.1.150200.9.95.3, 5.3.18-150300.59.158.1.150300.18.92.5
kernel-syms - addressed in versions 4.12.14-122.212.1, 5.3.18-150200.24.188.1, 5.3.18-150300.59.158.1
ocfs2-kmp-default - addressed in versions 4.12.14-122.212.1, 5.3.18-150200.24.188.1, 5.3.18-150300.59.158.1
cluster-md-kmp-default-debuginfo - addressed in versions 4.12.14-122.212.1, 5.3.18-150200.24.188.1, 5.3.18-150300.59.158.1
cluster-md-kmp-default - addressed in versions 4.12.14-122.212.1, 5.3.18-150200.24.188.1, 5.3.18-150300.59.158.1
kernel-macros - addressed in versions 4.12.14-122.212.1, 5.3.18-150200.24.188.1, 5.3.18-150300.59.158.1
kernel-source - addressed in versions 4.12.14-122.212.1, 5.3.18-150200.24.188.1, 5.3.18-150300.59.158.1
kernel-devel - addressed in versions 4.12.14-122.212.1, 5.3.18-150200.24.188.1, 5.3.18-150300.59.158.1
kernel-default-devel-debuginfo - addressed in versions 4.12.14-122.212.1, 5.3.18-150200.24.188.1, 5.3.18-150300.59.158.1
kernel-default-kgraft-devel - update to 4.12.14-122.212.1
kernel-default-kgraft - update to 4.12.14-122.212.1
kernel-docs - addressed in versions 4.12.14-122.212.1, 5.3.18-150200.24.188.1, 5.3.18-150300.59.158.1
kernel-obs-build - addressed in versions 4.12.14-122.212.1, 5.3.18-150200.24.188.1, 5.3.18-150300.59.158.1
kernel-obs-build-debugsource - addressed in versions 4.12.14-122.212.1, 5.3.18-150200.24.188.1, 5.3.18-150300.59.158.1
kernel-default-man - update to 4.12.14-122.212.1
kernel-default-extra - addressed in versions 4.12.14-122.212.1, 5.3.18-150300.59.158.1
kernel-default-extra-debuginfo - addressed in versions 4.12.14-122.212.1, 5.3.18-150300.59.158.1
kernel-default-debuginfo - addressed in versions 4.12.14-122.212.1, 5.3.18-150200.24.188.1, 5.3.18-150300.59.158.1
kernel-default-livepatch-devel - addressed in versions 5.3.18-150200.24.188.1, 5.3.18-150300.59.158.1
reiserfs-kmp-default-debuginfo - addressed in versions 5.3.18-150200.24.188.1, 5.3.18-150300.59.158.1
reiserfs-kmp-default - addressed in versions 5.3.18-150200.24.188.1, 5.3.18-150300.59.158.1
kernel-preempt-debuginfo - addressed in versions 5.3.18-150200.24.188.1, 5.3.18-150300.59.158.1
kernel-preempt-devel - addressed in versions 5.3.18-150200.24.188.1, 5.3.18-150300.59.158.1
kernel-preempt-debugsource - addressed in versions 5.3.18-150200.24.188.1, 5.3.18-150300.59.158.1
kernel-preempt - addressed in versions 5.3.18-150200.24.188.1, 5.3.18-150300.59.158.1
kernel-preempt-devel-debuginfo - addressed in versions 5.3.18-150200.24.188.1, 5.3.18-150300.59.158.1
kernel-default-livepatch - addressed in versions 5.3.18-150200.24.188.1, 5.3.18-150300.59.158.1
kernel-kvmsmall-livepatch-devel - update to 5.3.18-150300.59.158.1
kernel-kvmsmall-devel - update to 5.3.18-150300.59.158.1
kernel-debug-devel - update to 5.3.18-150300.59.158.1
kernel-debug-livepatch-devel - update to 5.3.18-150300.59.158.1
kernel-debug-debuginfo - update to 5.3.18-150300.59.158.1
kernel-debug - update to 5.3.18-150300.59.158.1
kernel-kvmsmall - update to 5.3.18-150300.59.158.1
kernel-source-vanilla - update to 5.3.18-150300.59.158.1
kernel-docs-html - update to 5.3.18-150300.59.158.1
kernel-64kb-debuginfo - update to 5.3.18-150300.59.158.1
kernel-64kb-devel-debuginfo - update to 5.3.18-150300.59.158.1
kernel-kvmsmall-debuginfo - update to 5.3.18-150300.59.158.1
kernel-debug-devel-debuginfo - update to 5.3.18-150300.59.158.1
kernel-kvmsmall-debugsource - update to 5.3.18-150300.59.158.1
kernel-debug-debugsource - update to 5.3.18-150300.59.158.1
kernel-kvmsmall-devel-debuginfo - update to 5.3.18-150300.59.158.1
kselftests-kmp-default - update to 5.3.18-150300.59.158.1
reiserfs-kmp-preempt - update to 5.3.18-150300.59.158.1
kernel-64kb-debugsource - update to 5.3.18-150300.59.158.1
kernel-64kb - update to 5.3.18-150300.59.158.1
kernel-64kb-devel - update to 5.3.18-150300.59.158.1
dtb-amd - update to 5.3.18-150300.59.158.1
dtb-sprd - update to 5.3.18-150300.59.158.1
dtb-renesas - update to 5.3.18-150300.59.158.1
dtb-freescale - update to 5.3.18-150300.59.158.1
kselftests-kmp-64kb - update to 5.3.18-150300.59.158.1
dtb-allwinner - update to 5.3.18-150300.59.158.1
dtb-hisilicon - update to 5.3.18-150300.59.158.1
gfs2-kmp-64kb-debuginfo - update to 5.3.18-150300.59.158.1
dtb-lg - update to 5.3.18-150300.59.158.1
dtb-altera - update to 5.3.18-150300.59.158.1
dtb-qcom - update to 5.3.18-150300.59.158.1
dtb-exynos - update to 5.3.18-150300.59.158.1
dtb-xilinx - update to 5.3.18-150300.59.158.1
kselftests-kmp-64kb-debuginfo - update to 5.3.18-150300.59.158.1
dtb-al - update to 5.3.18-150300.59.158.1
dtb-broadcom - update to 5.3.18-150300.59.158.1
cluster-md-kmp-64kb - update to 5.3.18-150300.59.158.1
reiserfs-kmp-64kb-debuginfo - update to 5.3.18-150300.59.158.1
kernel-64kb-optional-debuginfo - update to 5.3.18-150300.59.158.1
gfs2-kmp-preempt - update to 5.3.18-150300.59.158.1
cluster-md-kmp-preempt-debuginfo - update to 5.3.18-150300.59.158.1
kernel-preempt-extra - update to 5.3.18-150300.59.158.1
gfs2-kmp-preempt-debuginfo - update to 5.3.18-150300.59.158.1
kernel-preempt-extra-debuginfo - update to 5.3.18-150300.59.158.1
ocfs2-kmp-preempt - update to 5.3.18-150300.59.158.1
kernel-preempt-optional-debuginfo - update to 5.3.18-150300.59.158.1
kselftests-kmp-preempt - update to 5.3.18-150300.59.158.1
reiserfs-kmp-preempt-debuginfo - update to 5.3.18-150300.59.158.1
kernel-preempt-livepatch-devel - update to 5.3.18-150300.59.158.1
cluster-md-kmp-preempt - update to 5.3.18-150300.59.158.1
ocfs2-kmp-preempt-debuginfo - update to 5.3.18-150300.59.158.1
kselftests-kmp-preempt-debuginfo - update to 5.3.18-150300.59.158.1
kernel-zfcpdump - update to 5.3.18-150300.59.158.1
kernel-zfcpdump-debuginfo - update to 5.3.18-150300.59.158.1
kernel-zfcpdump-debugsource - update to 5.3.18-150300.59.158.1
dtb-aarch64 - update to 5.3.18-150300.59.158.1
cluster-md-kmp-64kb-debuginfo - update to 5.3.18-150300.59.158.1
dlm-kmp-64kb - update to 5.3.18-150300.59.158.1
dtb-apm - update to 5.3.18-150300.59.158.1
dtb-nvidia - update to 5.3.18-150300.59.158.1
dtb-amlogic - update to 5.3.18-150300.59.158.1
dlm-kmp-preempt - update to 5.3.18-150300.59.158.1
kernel-preempt-optional - update to 5.3.18-150300.59.158.1
dlm-kmp-preempt-debuginfo - update to 5.3.18-150300.59.158.1
ocfs2-kmp-64kb-debuginfo - update to 5.3.18-150300.59.158.1
kernel-obs-qa - update to 5.3.18-150300.59.158.1
kernel-default-optional-debuginfo - update to 5.3.18-150300.59.158.1
kernel-default-optional - update to 5.3.18-150300.59.158.1
kselftests-kmp-default-debuginfo - update to 5.3.18-150300.59.158.1
reiserfs-kmp-64kb - update to 5.3.18-150300.59.158.1
dtb-mediatek - update to 5.3.18-150300.59.158.1
ocfs2-kmp-64kb - update to 5.3.18-150300.59.158.1
kernel-64kb-extra-debuginfo - update to 5.3.18-150300.59.158.1
dtb-marvell - update to 5.3.18-150300.59.158.1
gfs2-kmp-64kb - update to 5.3.18-150300.59.158.1
dtb-cavium - update to 5.3.18-150300.59.158.1
dtb-zte - update to 5.3.18-150300.59.158.1
dlm-kmp-64kb-debuginfo - update to 5.3.18-150300.59.158.1
kernel-64kb-livepatch-devel - update to 5.3.18-150300.59.158.1
kernel-64kb-optional - update to 5.3.18-150300.59.158.1
dtb-arm - update to 5.3.18-150300.59.158.1
kernel-64kb-extra - update to 5.3.18-150300.59.158.1
dtb-rockchip - update to 5.3.18-150300.59.158.1
dtb-socionext - update to 5.3.18-150300.59.158.1
kernel-default-base-rebuild - update to 5.3.18-150300.59.158.1.150300.18.92.5

External References

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