Input validation error in Linux kernel - CVE-2021-47001

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Main Vulnerability Database Vulnerabilities #VU94145

Input validation error in Linux kernel - CVE-2021-47001

Published: July 11, 2024 / Updated: May 13, 2025


Vulnerability identifier: #VU94145
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-2021-47001
CWE-ID: CWE-20
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 improper input validation within the rpcrdma_xprt_connect() and rpcrdma_post_sends() functions in net/sunrpc/xprtrdma/verbs.c, within the rpcrdma_reply_handler() function in net/sunrpc/xprtrdma/rpc_rdma.c. A local user can perform a denial of service (DoS) attack.


Affected software

Linux kernel
SUSE Linux Enterprise High Availability Extension 15
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise High Performance Computing LTSS 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise Server 15
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 Live Patching
SUSE Linux Enterprise Server 15 SP3 LTSS
SUSE Linux Enterprise Server 15 SP3 Business Critical Linux
openSUSE Leap
Ubuntu
RSA Authentication Manager
linux-image-5.4.0-204-lowlatency (Ubuntu package)
linux-image-5.4.0-1142-azure (Ubuntu package)
linux-image-oracle (Ubuntu package)
linux-image-ibm (Ubuntu package)
linux-image-5.4.0-1141-gcp (Ubuntu package)
linux-image-aws (Ubuntu package)
linux-image-5.4.0-204-generic (Ubuntu package)
linux-image-5.4.0-1137-aws (Ubuntu package)
linux-image-5.4.0-1136-oracle (Ubuntu package)
linux-image-raspi-hwe-18.04 (Ubuntu package)
linux-image-5.4.0-1084-ibm (Ubuntu package)
linux-image-virtual-hwe-18.04 (Ubuntu package)
linux-image-snapdragon-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 (Ubuntu package)
linux-image-oem-osp1 (Ubuntu package)
linux-image-5.4.0-1121-raspi (Ubuntu package)
linux-image-azure (Ubuntu package)
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
kernel-livepatch-5_3_18-150300_59_158-default
kernel-livepatch-5_3_18-150300_59_158-default-debuginfo
dtb-xilinx
ocfs2-kmp-64kb
kselftests-kmp-64kb-debuginfo
dtb-al
dtb-broadcom
cluster-md-kmp-64kb
reiserfs-kmp-64kb-debuginfo
kernel-64kb-optional-debuginfo
dtb-socionext
dtb-mediatek
kernel-zfcpdump
dtb-exynos
dtb-amd
dtb-altera
dtb-lg
gfs2-kmp-64kb-debuginfo
dtb-hisilicon
dtb-allwinner
kselftests-kmp-64kb
dtb-freescale
dtb-renesas
dtb-sprd
dtb-qcom
dtb-aarch64
kernel-zfcpdump-debugsource
kernel-zfcpdump-debuginfo
kernel-preempt
dtb-apm
kernel-default
kernel-syms
kernel-obs-build-debugsource
reiserfs-kmp-default
reiserfs-kmp-default-debuginfo
kernel-default-debugsource
kernel-default-debuginfo
kernel-obs-build
kernel-default-devel
kernel-default-devel-debuginfo
kernel-macros
kernel-devel
kernel-source
dtb-amlogic
dtb-nvidia
kernel-64kb-extra-debuginfo
dlm-kmp-64kb
cluster-md-kmp-64kb-debuginfo
ocfs2-kmp-64kb-debuginfo
reiserfs-kmp-64kb
dtb-rockchip
kernel-64kb-extra
dtb-arm
kernel-64kb-optional
kernel-64kb-livepatch-devel
dlm-kmp-64kb-debuginfo
dtb-zte
dtb-cavium
gfs2-kmp-64kb
dtb-marvell
kernel-debug-debuginfo
dlm-kmp-default
kernel-default-extra
ocfs2-kmp-default
cluster-md-kmp-default
kselftests-kmp-default
kernel-kvmsmall-devel-debuginfo
kernel-debug-debugsource
kernel-kvmsmall-debugsource
kernel-debug-devel-debuginfo
kernel-kvmsmall-debuginfo
kernel-kvmsmall-livepatch-devel
kernel-kvmsmall-devel
kernel-debug-devel
kernel-debug-livepatch-devel
ocfs2-kmp-preempt-debuginfo
kernel-debug
kernel-kvmsmall
kernel-source-vanilla
kernel-docs-html
kernel-64kb-debuginfo
kernel-64kb-devel-debuginfo
kernel-64kb-debugsource
kernel-64kb-devel
kernel-64kb
kernel-preempt-devel
kernel-preempt-debugsource
kernel-preempt-devel-debuginfo
kernel-preempt-debuginfo
kernel-docs
kernel-default-livepatch-devel
kselftests-kmp-preempt-debuginfo
cluster-md-kmp-preempt
kernel-preempt-livepatch-devel
gfs2-kmp-preempt
reiserfs-kmp-preempt-debuginfo
kselftests-kmp-preempt
kernel-preempt-optional-debuginfo
ocfs2-kmp-preempt
kernel-preempt-extra-debuginfo
gfs2-kmp-preempt-debuginfo
kernel-preempt-extra
cluster-md-kmp-preempt-debuginfo
reiserfs-kmp-preempt
dlm-kmp-preempt
kernel-preempt-optional
dlm-kmp-preempt-debuginfo
dlm-kmp-default-debuginfo
gfs2-kmp-default
cluster-md-kmp-default-debuginfo
kernel-obs-qa
gfs2-kmp-default-debuginfo
ocfs2-kmp-default-debuginfo
kernel-default-optional-debuginfo
kernel-default-optional
kernel-default-extra-debuginfo
kselftests-kmp-default-debuginfo
kernel-default-livepatch
kernel-default-base-rebuild
kernel-default-base
kernel-rt-debugsource
kernel-rt
kernel-rt-debuginfo
kernel-source-rt
linux-image-virtual (Ubuntu package)
linux-image-lowlatency (Ubuntu package)
linux-image-generic-lpae (Ubuntu package)
linux-image-generic (Ubuntu package)
linux-image-5.4.0-204-generic-lpae (Ubuntu package)
linux-image-5.4.0-1048-iot (Ubuntu package)
linux-image-xilinx-zynqmp (Ubuntu package)
linux-image-5.4.0-1056-xilinx-zynqmp (Ubuntu package)
linux-image-ibm-lts-20.04 (Ubuntu package)
linux-image-bluefield (Ubuntu package)
linux-image-5.4.0-1097-bluefield (Ubuntu package)
linux-image-raspi (Ubuntu package)
linux-image-raspi2 (Ubuntu package)
linux-image-kvm (Ubuntu package)
linux-image-5.4.0-1125-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)

How to mitigate CVE-2021-47001

Install update from vendor's website.

Linux kernel - addressed in versions 5.10.38, 5.11.22, 5.12.5, 5.13
RSA Authentication Manager - update to 8.7 SP2 Patch 4
linux-image-5.4.0-204-lowlatency (Ubuntu package) - addressed in versions Ubuntu Pro, 5.4.0-204.224
linux-image-5.4.0-1142-azure (Ubuntu package) - addressed in versions Ubuntu Pro, 5.4.0-1142.149
linux-image-oracle (Ubuntu package) - update to Ubuntu Pro (Infra-only)
linux-image-ibm (Ubuntu package) - update to Ubuntu Pro
linux-image-5.4.0-1141-gcp (Ubuntu package) - addressed in versions Ubuntu Pro, 5.4.0-1141.150
linux-image-aws (Ubuntu package) - update to Ubuntu Pro (Infra-only)
linux-image-5.4.0-204-generic (Ubuntu package) - addressed in versions Ubuntu Pro, 5.4.0-204.224
linux-image-5.4.0-1137-aws (Ubuntu package) - addressed in versions Ubuntu Pro, 5.4.0-1137.147
linux-image-5.4.0-1136-oracle (Ubuntu package) - addressed in versions Ubuntu Pro, 5.4.0-1136.145
linux-image-raspi-hwe-18.04 (Ubuntu package) - update to Ubuntu Pro
linux-image-5.4.0-1084-ibm (Ubuntu package) - addressed in versions Ubuntu Pro, 5.4.0-1084.89
linux-image-virtual-hwe-18.04 (Ubuntu package) - update to Ubuntu Pro
linux-image-snapdragon-hwe-18.04 (Ubuntu package) - update to Ubuntu Pro
linux-image-lowlatency-hwe-18.04 (Ubuntu package) - update to Ubuntu Pro
linux-image-generic-hwe-18.04 (Ubuntu package) - update to Ubuntu Pro
linux-image-gcp (Ubuntu package) - update to Ubuntu Pro (Infra-only)
linux-image-oem (Ubuntu package) - addressed in versions Ubuntu Pro (Infra-only), 5.4.0.204.200
linux-image-oem-osp1 (Ubuntu package) - addressed in versions Ubuntu Pro, 5.4.0.204.200
linux-image-5.4.0-1121-raspi (Ubuntu package) - addressed in versions Ubuntu Pro, 5.4.0-1121.133
linux-image-azure (Ubuntu package) - update to Ubuntu Pro (Infra-only)
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
kernel-livepatch-5_3_18-150300_59_158-default - update to 1-150300.7.3.5
kernel-livepatch-5_3_18-150300_59_158-default-debuginfo - update to 1-150300.7.3.5
dtb-xilinx - update to 5.3.18-150300.59.158.1
ocfs2-kmp-64kb - 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
dtb-socionext - update to 5.3.18-150300.59.158.1
dtb-mediatek - update to 5.3.18-150300.59.158.1
kernel-zfcpdump - update to 5.3.18-150300.59.158.1
dtb-exynos - update to 5.3.18-150300.59.158.1
dtb-amd - update to 5.3.18-150300.59.158.1
dtb-altera - update to 5.3.18-150300.59.158.1
dtb-lg - update to 5.3.18-150300.59.158.1
gfs2-kmp-64kb-debuginfo - update to 5.3.18-150300.59.158.1
dtb-hisilicon - update to 5.3.18-150300.59.158.1
dtb-allwinner - update to 5.3.18-150300.59.158.1
kselftests-kmp-64kb - update to 5.3.18-150300.59.158.1
dtb-freescale - update to 5.3.18-150300.59.158.1
dtb-renesas - update to 5.3.18-150300.59.158.1
dtb-sprd - update to 5.3.18-150300.59.158.1
dtb-qcom - update to 5.3.18-150300.59.158.1
dtb-aarch64 - update to 5.3.18-150300.59.158.1
kernel-zfcpdump-debugsource - update to 5.3.18-150300.59.158.1
kernel-zfcpdump-debuginfo - update to 5.3.18-150300.59.158.1
kernel-preempt - update to 5.3.18-150300.59.158.1
dtb-apm - update to 5.3.18-150300.59.158.1
kernel-default - update to 5.3.18-150300.59.158.1
kernel-syms - update to 5.3.18-150300.59.158.1
kernel-obs-build-debugsource - update to 5.3.18-150300.59.158.1
reiserfs-kmp-default - update to 5.3.18-150300.59.158.1
reiserfs-kmp-default-debuginfo - update to 5.3.18-150300.59.158.1
kernel-default-debugsource - update to 5.3.18-150300.59.158.1
kernel-default-debuginfo - update to 5.3.18-150300.59.158.1
kernel-obs-build - update to 5.3.18-150300.59.158.1
kernel-default-devel - update to 5.3.18-150300.59.158.1
kernel-default-devel-debuginfo - update to 5.3.18-150300.59.158.1
kernel-macros - update to 5.3.18-150300.59.158.1
kernel-devel - update to 5.3.18-150300.59.158.1
kernel-source - update to 5.3.18-150300.59.158.1
dtb-amlogic - update to 5.3.18-150300.59.158.1
dtb-nvidia - update to 5.3.18-150300.59.158.1
kernel-64kb-extra-debuginfo - update to 5.3.18-150300.59.158.1
dlm-kmp-64kb - update to 5.3.18-150300.59.158.1
cluster-md-kmp-64kb-debuginfo - update to 5.3.18-150300.59.158.1
ocfs2-kmp-64kb-debuginfo - update to 5.3.18-150300.59.158.1
reiserfs-kmp-64kb - update to 5.3.18-150300.59.158.1
dtb-rockchip - update to 5.3.18-150300.59.158.1
kernel-64kb-extra - update to 5.3.18-150300.59.158.1
dtb-arm - update to 5.3.18-150300.59.158.1
kernel-64kb-optional - update to 5.3.18-150300.59.158.1
kernel-64kb-livepatch-devel - update to 5.3.18-150300.59.158.1
dlm-kmp-64kb-debuginfo - update to 5.3.18-150300.59.158.1
dtb-zte - update to 5.3.18-150300.59.158.1
dtb-cavium - update to 5.3.18-150300.59.158.1
gfs2-kmp-64kb - update to 5.3.18-150300.59.158.1
dtb-marvell - update to 5.3.18-150300.59.158.1
kernel-debug-debuginfo - update to 5.3.18-150300.59.158.1
dlm-kmp-default - update to 5.3.18-150300.59.158.1
kernel-default-extra - update to 5.3.18-150300.59.158.1
ocfs2-kmp-default - update to 5.3.18-150300.59.158.1
cluster-md-kmp-default - update to 5.3.18-150300.59.158.1
kselftests-kmp-default - update to 5.3.18-150300.59.158.1
kernel-kvmsmall-devel-debuginfo - update to 5.3.18-150300.59.158.1
kernel-debug-debugsource - update to 5.3.18-150300.59.158.1
kernel-kvmsmall-debugsource - update to 5.3.18-150300.59.158.1
kernel-debug-devel-debuginfo - update to 5.3.18-150300.59.158.1
kernel-kvmsmall-debuginfo - update to 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
ocfs2-kmp-preempt-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-64kb-debugsource - update to 5.3.18-150300.59.158.1
kernel-64kb-devel - update to 5.3.18-150300.59.158.1
kernel-64kb - update to 5.3.18-150300.59.158.1
kernel-preempt-devel - update to 5.3.18-150300.59.158.1
kernel-preempt-debugsource - update to 5.3.18-150300.59.158.1
kernel-preempt-devel-debuginfo - update to 5.3.18-150300.59.158.1
kernel-preempt-debuginfo - update to 5.3.18-150300.59.158.1
kernel-docs - update to 5.3.18-150300.59.158.1
kernel-default-livepatch-devel - update to 5.3.18-150300.59.158.1
kselftests-kmp-preempt-debuginfo - update to 5.3.18-150300.59.158.1
cluster-md-kmp-preempt - update to 5.3.18-150300.59.158.1
kernel-preempt-livepatch-devel - update to 5.3.18-150300.59.158.1
gfs2-kmp-preempt - update to 5.3.18-150300.59.158.1
reiserfs-kmp-preempt-debuginfo - update to 5.3.18-150300.59.158.1
kselftests-kmp-preempt - update to 5.3.18-150300.59.158.1
kernel-preempt-optional-debuginfo - update to 5.3.18-150300.59.158.1
ocfs2-kmp-preempt - update to 5.3.18-150300.59.158.1
kernel-preempt-extra-debuginfo - 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 - update to 5.3.18-150300.59.158.1
cluster-md-kmp-preempt-debuginfo - update to 5.3.18-150300.59.158.1
reiserfs-kmp-preempt - 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
dlm-kmp-default-debuginfo - update to 5.3.18-150300.59.158.1
gfs2-kmp-default - update to 5.3.18-150300.59.158.1
cluster-md-kmp-default-debuginfo - update to 5.3.18-150300.59.158.1
kernel-obs-qa - update to 5.3.18-150300.59.158.1
gfs2-kmp-default-debuginfo - update to 5.3.18-150300.59.158.1
ocfs2-kmp-default-debuginfo - 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
kernel-default-extra-debuginfo - update to 5.3.18-150300.59.158.1
kselftests-kmp-default-debuginfo - update to 5.3.18-150300.59.158.1
kernel-default-livepatch - 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
kernel-default-base - update to 5.3.18-150300.59.158.1.150300.18.92.5
kernel-rt-debugsource - update to 5.3.18-150300.166.1
kernel-rt - update to 5.3.18-150300.166.1
kernel-rt-debuginfo - update to 5.3.18-150300.166.1
kernel-source-rt - update to 5.3.18-150300.166.1
linux-image-virtual (Ubuntu package) - update to 5.4.0.204.200
linux-image-lowlatency (Ubuntu package) - update to 5.4.0.204.200
linux-image-generic-lpae (Ubuntu package) - update to 5.4.0.204.200
linux-image-generic (Ubuntu package) - update to 5.4.0.204.200
linux-image-5.4.0-204-generic-lpae (Ubuntu package) - update to 5.4.0-204.224
linux-image-5.4.0-1048-iot (Ubuntu package) - update to 5.4.0-1048.51
linux-image-xilinx-zynqmp (Ubuntu package) - update to 5.4.0.1056.56
linux-image-5.4.0-1056-xilinx-zynqmp (Ubuntu package) - update to 5.4.0-1056.60
linux-image-ibm-lts-20.04 (Ubuntu package) - update to 5.4.0.1084.113
linux-image-bluefield (Ubuntu package) - update to 5.4.0.1097.93
linux-image-5.4.0-1097-bluefield (Ubuntu package) - update to 5.4.0-1097.104
linux-image-raspi (Ubuntu package) - update to 5.4.0.1121.151
linux-image-raspi2 (Ubuntu package) - update to 5.4.0.1121.151
linux-image-kvm (Ubuntu package) - update to 5.4.0.1125.121
linux-image-5.4.0-1125-kvm (Ubuntu package) - update to 5.4.0-1125.133
linux-image-oracle-lts-20.04 (Ubuntu package) - update to 5.4.0.1136.129
linux-image-aws-lts-20.04 (Ubuntu package) - update to 5.4.0.1137.134
linux-image-gcp-lts-20.04 (Ubuntu package) - update to 5.4.0.1141.143
linux-image-azure-lts-20.04 (Ubuntu package) - update to 5.4.0.1142.136

External References

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