NULL pointer dereference in Linux kernel - CVE-2021-47260

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Main Vulnerability Database Vulnerabilities #VU91230

NULL pointer dereference in Linux kernel - CVE-2021-47260

Published: June 5, 2024 / Updated: May 13, 2025


Vulnerability identifier: #VU91230
CSH Severity: Low
CVSS v4: 6.8 [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]
CVE-ID: CVE-2021-47260
CWE-ID: CWE-476
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 NULL pointer dereference within the nfs_get_client() function in fs/nfs/client.c. A local user can perform a denial of service (DoS) attack.


Affected software

Linux kernel
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise High Availability Extension 15
SUSE Linux Enterprise High Performance Computing LTSS 15
SUSE Linux Enterprise Software Development Kit 12
SUSE Linux Enterprise High Performance Computing 12
SUSE Linux Enterprise Server for SAP Applications 12
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise High Availability Extension 12
SUSE Linux Enterprise Real Time 12
SUSE Manager Retail Branch Server
SUSE Manager Server
SUSE Manager Proxy
SUSE Linux Enterprise Micro
SUSE Linux Enterprise Micro for Rancher
SUSE Enterprise Storage
SUSE Linux Enterprise Live Patching
SUSE Linux Enterprise Workstation Extension 12
Ubuntu
SUSE Linux Enterprise Server 15 SP2 Business Critical Linux
SUSE Linux Enterprise High Performance Computing 15 SP2 LTSS
SUSE Linux Enterprise Server 15 SP2 LTSS
SUSE Linux Enterprise Server 15 SP3 LTSS
SUSE Linux Enterprise Server 15 SP3 Business Critical Linux
openSUSE Leap
kgraft-patch-4_12_14-122_219-default
kernel-livepatch-5_3_18-150200_24_194-default
kernel-livepatch-5_3_18-150200_24_194-default-debuginfo
kernel-livepatch-SLE15-SP2_Update_49-debugsource
kernel-livepatch-SLE15-SP3_Update_45-debugsource
kernel-livepatch-5_3_18-150300_59_164-default
kernel-livepatch-5_3_18-150300_59_164-default-debuginfo
kernel-livepatch-5_3_18-150300_59_164-preempt-debuginfo
kernel-livepatch-5_3_18-150300_59_164-preempt
linux (Ubuntu package)
linux-fips (Ubuntu package)
linux-kvm (Ubuntu package)
gfs2-kmp-rt
gfs2-kmp-rt-debuginfo
kernel-rt-devel
kernel-rt-debugsource
kernel-rt_debug-debugsource
cluster-md-kmp-rt-debuginfo
dlm-kmp-rt-debuginfo
cluster-md-kmp-rt
kernel-rt_debug-devel-debuginfo
kernel-syms-rt
kernel-rt_debug
kernel-rt
kernel-source-rt
kernel-devel-rt
kernel-rt_debug-devel
kernel-rt_debug-debuginfo
dlm-kmp-rt
ocfs2-kmp-rt
kernel-rt-base-debuginfo
kernel-rt-base
kernel-rt-devel-debuginfo
kernel-rt-debuginfo
ocfs2-kmp-rt-debuginfo
kernel-azure-base
kernel-azure
kernel-syms-azure
kernel-azure-debuginfo
kernel-azure-devel
kernel-azure-base-debuginfo
kernel-azure-debugsource
kernel-devel-azure
kernel-source-azure
cluster-md-kmp-default-debuginfo
kernel-default
kernel-default-devel
dlm-kmp-default
kernel-default-debugsource
cluster-md-kmp-default
kernel-syms
dlm-kmp-default-debuginfo
gfs2-kmp-default-debuginfo
ocfs2-kmp-default
kernel-default-base
kernel-default-base-debuginfo
ocfs2-kmp-default-debuginfo
kernel-default-extra
kernel-default-extra-debuginfo
kernel-default-man
kernel-obs-build-debugsource
kernel-obs-build
kernel-docs
kernel-default-debuginfo
kernel-default-kgraft-devel
kernel-default-kgraft
kernel-default-devel-debuginfo
kernel-devel
kernel-source
kernel-macros
gfs2-kmp-default
kernel-default-livepatch
reiserfs-kmp-default
reiserfs-kmp-default-debuginfo
kernel-default-livepatch-devel
kernel-preempt
kernel-preempt-debugsource
kernel-preempt-devel-debuginfo
kernel-preempt-devel
kernel-preempt-debuginfo
dtb-freescale
dtb-altera
kernel-64kb-optional
ocfs2-kmp-64kb-debuginfo
dtb-apm
dtb-exynos
dtb-socionext
kernel-64kb-optional-debuginfo
kernel-64kb-devel-debuginfo
dtb-amd
dlm-kmp-64kb-debuginfo
dtb-qcom
dtb-marvell
dtb-mediatek
dlm-kmp-preempt-debuginfo
reiserfs-kmp-64kb
kernel-64kb-livepatch-devel
kernel-64kb-debugsource
dtb-arm
dtb-hisilicon
dtb-sprd
dtb-rockchip
dtb-aarch64
kernel-zfcpdump-debuginfo
kernel-zfcpdump-debugsource
kernel-zfcpdump
kernel-kvmsmall
kernel-preempt-extra-debuginfo
kernel-64kb-extra
kernel-source-vanilla
kernel-64kb
dtb-allwinner
dtb-lg
dtb-al
kernel-64kb-extra-debuginfo
dtb-amlogic
dtb-nvidia
cluster-md-kmp-64kb-debuginfo
gfs2-kmp-64kb-debuginfo
dtb-broadcom
cluster-md-kmp-64kb
reiserfs-kmp-64kb-debuginfo
dtb-xilinx
dtb-renesas
kselftests-kmp-64kb-debuginfo
dtb-cavium
kernel-64kb-devel
gfs2-kmp-64kb
dlm-kmp-64kb
kselftests-kmp-64kb
ocfs2-kmp-64kb
kernel-64kb-debuginfo
dtb-zte
kernel-default-optional-debuginfo
kselftests-kmp-default
ocfs2-kmp-preempt-debuginfo
kernel-default-optional
kernel-kvmsmall-debuginfo
kernel-kvmsmall-livepatch-devel
kernel-kvmsmall-devel-debuginfo
kernel-debug-devel-debuginfo
kernel-debug-debuginfo
kernel-debug-debugsource
kernel-kvmsmall-debugsource
kernel-debug-livepatch-devel
kernel-debug-devel
kernel-kvmsmall-devel
kernel-debug
gfs2-kmp-preempt
reiserfs-kmp-preempt
kernel-preempt-livepatch-devel
kernel-preempt-optional-debuginfo
dlm-kmp-preempt
kernel-preempt-extra
kernel-preempt-optional
reiserfs-kmp-preempt-debuginfo
cluster-md-kmp-preempt-debuginfo
kselftests-kmp-preempt
kselftests-kmp-default-debuginfo
kselftests-kmp-preempt-debuginfo
gfs2-kmp-preempt-debuginfo
kernel-obs-qa
kernel-docs-html
cluster-md-kmp-preempt
ocfs2-kmp-preempt
kernel-default-base-rebuild
Dell Secure Connect Gateway
EMC Cloud Tiering Appliance

How to mitigate CVE-2021-47260

Install update from vendor's website.

Linux kernel - addressed in versions 4.4.273, 4.9.273, 4.14.237, 4.19.195, 5.4.126, 5.10.44, 5.12.11, 5.13
kgraft-patch-4_12_14-122_219-default - update to 1-8.3.1
kernel-livepatch-5_3_18-150200_24_194-default - update to 1-150200.5.3.1
kernel-livepatch-5_3_18-150200_24_194-default-debuginfo - update to 1-150200.5.3.1
kernel-livepatch-SLE15-SP2_Update_49-debugsource - update to 1-150200.5.3.1
kernel-livepatch-SLE15-SP3_Update_45-debugsource - update to 1-150300.7.3.1
kernel-livepatch-5_3_18-150300_59_164-default - update to 1-150300.7.3.1
kernel-livepatch-5_3_18-150300_59_164-default-debuginfo - update to 1-150300.7.3.1
kernel-livepatch-5_3_18-150300_59_164-preempt-debuginfo - update to 1-150300.7.3.1
kernel-livepatch-5_3_18-150300_59_164-preempt - update to 1-150300.7.3.1
linux (Ubuntu package) - addressed in versions 4.4.0.270.276, 4.4.0-270.304, 4.4.0.270.304~14.04.1, 4.4.0-270.304~14.04.1, 4.4.0.1145.142, 4.4.0-1145.151, 4.4.0.1183.187, 4.4.0-1183.198
linux-fips (Ubuntu package) - addressed in versions 4.4.0.1115.116, 4.4.0-1115.122
linux-kvm (Ubuntu package) - addressed in versions 4.4.0.1146.143, 4.4.0-1146.157
gfs2-kmp-rt - update to 4.12.14-10.188.1
gfs2-kmp-rt-debuginfo - update to 4.12.14-10.188.1
kernel-rt-devel - update to 4.12.14-10.188.1
kernel-rt-debugsource - addressed in versions 4.12.14-10.188.1, 5.3.18-150300.172.1, 5.3.18-150300.211.1
kernel-rt_debug-debugsource - update to 4.12.14-10.188.1
cluster-md-kmp-rt-debuginfo - update to 4.12.14-10.188.1
dlm-kmp-rt-debuginfo - update to 4.12.14-10.188.1
cluster-md-kmp-rt - update to 4.12.14-10.188.1
kernel-rt_debug-devel-debuginfo - update to 4.12.14-10.188.1
kernel-syms-rt - update to 4.12.14-10.188.1
kernel-rt_debug - update to 4.12.14-10.188.1
kernel-rt - addressed in versions 4.12.14-10.188.1, 5.3.18-150300.172.1, 5.3.18-150300.211.1
kernel-source-rt - addressed in versions 4.12.14-10.188.1, 5.3.18-150300.172.1, 5.3.18-150300.211.1
kernel-devel-rt - update to 4.12.14-10.188.1
kernel-rt_debug-devel - update to 4.12.14-10.188.1
kernel-rt_debug-debuginfo - update to 4.12.14-10.188.1
dlm-kmp-rt - update to 4.12.14-10.188.1
ocfs2-kmp-rt - update to 4.12.14-10.188.1
kernel-rt-base-debuginfo - update to 4.12.14-10.188.1
kernel-rt-base - update to 4.12.14-10.188.1
kernel-rt-devel-debuginfo - update to 4.12.14-10.188.1
kernel-rt-debuginfo - addressed in versions 4.12.14-10.188.1, 5.3.18-150300.172.1, 5.3.18-150300.211.1
ocfs2-kmp-rt-debuginfo - update to 4.12.14-10.188.1
kernel-azure-base - update to 4.12.14-16.188.1
kernel-azure - update to 4.12.14-16.188.1
kernel-syms-azure - update to 4.12.14-16.188.1
kernel-azure-debuginfo - update to 4.12.14-16.188.1
kernel-azure-devel - update to 4.12.14-16.188.1
kernel-azure-base-debuginfo - update to 4.12.14-16.188.1
kernel-azure-debugsource - update to 4.12.14-16.188.1
kernel-devel-azure - update to 4.12.14-16.188.1
kernel-source-azure - update to 4.12.14-16.188.1
cluster-md-kmp-default-debuginfo - addressed in versions 4.12.14-122.219.1, 5.3.18-150200.24.194.1, 5.3.18-150300.59.164.1
kernel-default - addressed in versions 4.12.14-122.219.1, 5.3.18-150200.24.194.1, 5.3.18-150300.59.164.1
kernel-default-devel - addressed in versions 4.12.14-122.219.1, 5.3.18-150200.24.194.1, 5.3.18-150300.59.164.1
dlm-kmp-default - addressed in versions 4.12.14-122.219.1, 5.3.18-150200.24.194.1, 5.3.18-150300.59.164.1
kernel-default-debugsource - addressed in versions 4.12.14-122.219.1, 5.3.18-150200.24.194.1, 5.3.18-150300.59.164.1
cluster-md-kmp-default - addressed in versions 4.12.14-122.219.1, 5.3.18-150200.24.194.1, 5.3.18-150300.59.164.1
kernel-syms - addressed in versions 4.12.14-122.219.1, 5.3.18-150200.24.194.1, 5.3.18-150300.59.164.1
dlm-kmp-default-debuginfo - addressed in versions 4.12.14-122.219.1, 5.3.18-150200.24.194.1, 5.3.18-150300.59.164.1
gfs2-kmp-default-debuginfo - addressed in versions 4.12.14-122.219.1, 5.3.18-150200.24.194.1, 5.3.18-150300.59.164.1
ocfs2-kmp-default - addressed in versions 4.12.14-122.219.1, 5.3.18-150200.24.194.1, 5.3.18-150300.59.164.1
kernel-default-base - addressed in versions 4.12.14-122.219.1, 5.3.18-150200.24.194.1.150200.9.99.1, 5.3.18-150300.59.164.1.150300.18.96.1
kernel-default-base-debuginfo - update to 4.12.14-122.219.1
ocfs2-kmp-default-debuginfo - addressed in versions 4.12.14-122.219.1, 5.3.18-150200.24.194.1, 5.3.18-150300.59.164.1
kernel-default-extra - addressed in versions 4.12.14-122.219.1, 5.3.18-150300.59.164.1
kernel-default-extra-debuginfo - addressed in versions 4.12.14-122.219.1, 5.3.18-150300.59.164.1
kernel-default-man - update to 4.12.14-122.219.1
kernel-obs-build-debugsource - addressed in versions 4.12.14-122.219.1, 5.3.18-150200.24.194.1, 5.3.18-150300.59.164.1
kernel-obs-build - addressed in versions 4.12.14-122.219.1, 5.3.18-150200.24.194.1, 5.3.18-150300.59.164.1
kernel-docs - addressed in versions 4.12.14-122.219.1, 5.3.18-150200.24.194.1, 5.3.18-150300.59.164.1
kernel-default-debuginfo - addressed in versions 4.12.14-122.219.1, 5.3.18-150200.24.194.1, 5.3.18-150300.59.164.1
kernel-default-kgraft-devel - update to 4.12.14-122.219.1
kernel-default-kgraft - update to 4.12.14-122.219.1
kernel-default-devel-debuginfo - addressed in versions 4.12.14-122.219.1, 5.3.18-150200.24.194.1, 5.3.18-150300.59.164.1
kernel-devel - addressed in versions 4.12.14-122.219.1, 5.3.18-150200.24.194.1, 5.3.18-150300.59.164.1
kernel-source - addressed in versions 4.12.14-122.219.1, 5.3.18-150200.24.194.1, 5.3.18-150300.59.164.1
kernel-macros - addressed in versions 4.12.14-122.219.1, 5.3.18-150200.24.194.1, 5.3.18-150300.59.164.1
gfs2-kmp-default - addressed in versions 4.12.14-122.219.1, 5.3.18-150200.24.194.1, 5.3.18-150300.59.164.1
kernel-default-livepatch - addressed in versions 5.3.18-150200.24.194.1, 5.3.18-150300.59.164.1
reiserfs-kmp-default - addressed in versions 5.3.18-150200.24.194.1, 5.3.18-150300.59.164.1
reiserfs-kmp-default-debuginfo - addressed in versions 5.3.18-150200.24.194.1, 5.3.18-150300.59.164.1
kernel-default-livepatch-devel - addressed in versions 5.3.18-150200.24.194.1, 5.3.18-150300.59.164.1
kernel-preempt - addressed in versions 5.3.18-150200.24.194.1, 5.3.18-150300.59.164.1
kernel-preempt-debugsource - addressed in versions 5.3.18-150200.24.194.1, 5.3.18-150300.59.164.1
kernel-preempt-devel-debuginfo - addressed in versions 5.3.18-150200.24.194.1, 5.3.18-150300.59.164.1
kernel-preempt-devel - addressed in versions 5.3.18-150200.24.194.1, 5.3.18-150300.59.164.1
kernel-preempt-debuginfo - addressed in versions 5.3.18-150200.24.194.1, 5.3.18-150300.59.164.1
dtb-freescale - update to 5.3.18-150300.59.164.1
dtb-altera - update to 5.3.18-150300.59.164.1
kernel-64kb-optional - update to 5.3.18-150300.59.164.1
ocfs2-kmp-64kb-debuginfo - update to 5.3.18-150300.59.164.1
dtb-apm - update to 5.3.18-150300.59.164.1
dtb-exynos - update to 5.3.18-150300.59.164.1
dtb-socionext - update to 5.3.18-150300.59.164.1
kernel-64kb-optional-debuginfo - update to 5.3.18-150300.59.164.1
kernel-64kb-devel-debuginfo - update to 5.3.18-150300.59.164.1
dtb-amd - update to 5.3.18-150300.59.164.1
dlm-kmp-64kb-debuginfo - update to 5.3.18-150300.59.164.1
dtb-qcom - update to 5.3.18-150300.59.164.1
dtb-marvell - update to 5.3.18-150300.59.164.1
dtb-mediatek - update to 5.3.18-150300.59.164.1
dlm-kmp-preempt-debuginfo - update to 5.3.18-150300.59.164.1
reiserfs-kmp-64kb - update to 5.3.18-150300.59.164.1
kernel-64kb-livepatch-devel - update to 5.3.18-150300.59.164.1
kernel-64kb-debugsource - update to 5.3.18-150300.59.164.1
dtb-arm - update to 5.3.18-150300.59.164.1
dtb-hisilicon - update to 5.3.18-150300.59.164.1
dtb-sprd - update to 5.3.18-150300.59.164.1
dtb-rockchip - update to 5.3.18-150300.59.164.1
dtb-aarch64 - update to 5.3.18-150300.59.164.1
kernel-zfcpdump-debuginfo - update to 5.3.18-150300.59.164.1
kernel-zfcpdump-debugsource - update to 5.3.18-150300.59.164.1
kernel-zfcpdump - update to 5.3.18-150300.59.164.1
kernel-kvmsmall - update to 5.3.18-150300.59.164.1
kernel-preempt-extra-debuginfo - update to 5.3.18-150300.59.164.1
kernel-64kb-extra - update to 5.3.18-150300.59.164.1
kernel-source-vanilla - update to 5.3.18-150300.59.164.1
kernel-64kb - update to 5.3.18-150300.59.164.1
dtb-allwinner - update to 5.3.18-150300.59.164.1
dtb-lg - update to 5.3.18-150300.59.164.1
dtb-al - update to 5.3.18-150300.59.164.1
kernel-64kb-extra-debuginfo - update to 5.3.18-150300.59.164.1
dtb-amlogic - update to 5.3.18-150300.59.164.1
dtb-nvidia - update to 5.3.18-150300.59.164.1
cluster-md-kmp-64kb-debuginfo - update to 5.3.18-150300.59.164.1
gfs2-kmp-64kb-debuginfo - update to 5.3.18-150300.59.164.1
dtb-broadcom - update to 5.3.18-150300.59.164.1
cluster-md-kmp-64kb - update to 5.3.18-150300.59.164.1
reiserfs-kmp-64kb-debuginfo - update to 5.3.18-150300.59.164.1
dtb-xilinx - update to 5.3.18-150300.59.164.1
dtb-renesas - update to 5.3.18-150300.59.164.1
kselftests-kmp-64kb-debuginfo - update to 5.3.18-150300.59.164.1
dtb-cavium - update to 5.3.18-150300.59.164.1
kernel-64kb-devel - update to 5.3.18-150300.59.164.1
gfs2-kmp-64kb - update to 5.3.18-150300.59.164.1
dlm-kmp-64kb - update to 5.3.18-150300.59.164.1
kselftests-kmp-64kb - update to 5.3.18-150300.59.164.1
ocfs2-kmp-64kb - update to 5.3.18-150300.59.164.1
kernel-64kb-debuginfo - update to 5.3.18-150300.59.164.1
dtb-zte - update to 5.3.18-150300.59.164.1
kernel-default-optional-debuginfo - update to 5.3.18-150300.59.164.1
kselftests-kmp-default - update to 5.3.18-150300.59.164.1
ocfs2-kmp-preempt-debuginfo - update to 5.3.18-150300.59.164.1
kernel-default-optional - update to 5.3.18-150300.59.164.1
kernel-kvmsmall-debuginfo - update to 5.3.18-150300.59.164.1
kernel-kvmsmall-livepatch-devel - update to 5.3.18-150300.59.164.1
kernel-kvmsmall-devel-debuginfo - update to 5.3.18-150300.59.164.1
kernel-debug-devel-debuginfo - update to 5.3.18-150300.59.164.1
kernel-debug-debuginfo - update to 5.3.18-150300.59.164.1
kernel-debug-debugsource - update to 5.3.18-150300.59.164.1
kernel-kvmsmall-debugsource - update to 5.3.18-150300.59.164.1
kernel-debug-livepatch-devel - update to 5.3.18-150300.59.164.1
kernel-debug-devel - update to 5.3.18-150300.59.164.1
kernel-kvmsmall-devel - update to 5.3.18-150300.59.164.1
kernel-debug - update to 5.3.18-150300.59.164.1
gfs2-kmp-preempt - update to 5.3.18-150300.59.164.1
reiserfs-kmp-preempt - update to 5.3.18-150300.59.164.1
kernel-preempt-livepatch-devel - update to 5.3.18-150300.59.164.1
kernel-preempt-optional-debuginfo - update to 5.3.18-150300.59.164.1
dlm-kmp-preempt - update to 5.3.18-150300.59.164.1
kernel-preempt-extra - update to 5.3.18-150300.59.164.1
kernel-preempt-optional - update to 5.3.18-150300.59.164.1
reiserfs-kmp-preempt-debuginfo - update to 5.3.18-150300.59.164.1
cluster-md-kmp-preempt-debuginfo - update to 5.3.18-150300.59.164.1
kselftests-kmp-preempt - update to 5.3.18-150300.59.164.1
kselftests-kmp-default-debuginfo - update to 5.3.18-150300.59.164.1
kselftests-kmp-preempt-debuginfo - update to 5.3.18-150300.59.164.1
gfs2-kmp-preempt-debuginfo - update to 5.3.18-150300.59.164.1
kernel-obs-qa - update to 5.3.18-150300.59.164.1
kernel-docs-html - update to 5.3.18-150300.59.164.1
cluster-md-kmp-preempt - update to 5.3.18-150300.59.164.1
ocfs2-kmp-preempt - update to 5.3.18-150300.59.164.1
kernel-default-base-rebuild - update to 5.3.18-150300.59.164.1.150300.18.96.1
Dell Secure Connect Gateway - update to 5.26.00.18
EMC Cloud Tiering Appliance - update to 13.2.0.2.31

External References

Related Security Bulletins