Use-after-free in Linux kernel - CVE-2021-47061

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Main Vulnerability Database Vulnerabilities #VU90244

Use-after-free in Linux kernel - CVE-2021-47061

Published: May 31, 2024 / Updated: May 14, 2025


Vulnerability identifier: #VU90244
CSH Severity: Low
CVSS v4 BT: 5.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]
CVE-ID: CVE-2021-47061
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a use-after-free error within the kvm_io_bus_unregister_dev() function in virt/kvm/kvm_main.c. A local user can escalate privileges on the system.


Affected software

Linux kernel
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise High Availability Extension 15
SUSE Linux Enterprise Server 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 Server for SAP Applications 12
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise Real Time 12
SUSE Linux Enterprise High Availability Extension 12
SUSE Linux Enterprise Software Development Kit 12
SUSE Manager Proxy
SUSE Manager Server
SUSE Manager Retail Branch Server
SUSE Linux Enterprise Micro
SUSE Linux Enterprise Micro for Rancher
SUSE Enterprise Storage
SUSE Linux Enterprise Live Patching
SUSE Linux Enterprise Workstation Extension 12
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 LTSS
SUSE Linux Enterprise Server 15 SP3 Business Critical Linux
openSUSE Leap
openEuler
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-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
kernel-rt-devel-debuginfo
kernel-rt-debuginfo
kernel-syms-rt
kernel-rt_debug-debugsource
ocfs2-kmp-rt
dlm-kmp-rt
kernel-rt_debug-debuginfo
cluster-md-kmp-rt-debuginfo
kernel-rt-devel
gfs2-kmp-rt
cluster-md-kmp-rt
kernel-rt-debugsource
kernel-rt-base-debuginfo
kernel-rt-base
gfs2-kmp-rt-debuginfo
dlm-kmp-rt-debuginfo
ocfs2-kmp-rt-debuginfo
kernel-rt_debug-devel-debuginfo
kernel-rt_debug-devel
kernel-devel-rt
kernel-source-rt
kernel-rt_debug
kernel-rt
kernel-azure
kernel-devel-azure
kernel-azure-base
kernel-azure-devel
kernel-azure-debugsource
kernel-azure-debuginfo
kernel-syms-azure
kernel-azure-base-debuginfo
kernel-source-azure
cluster-md-kmp-default
kernel-obs-build-debugsource
kernel-default
kernel-source
kernel-macros
kernel-devel
kernel-default-devel-debuginfo
kernel-default-extra-debuginfo
kernel-default-kgraft-devel
kernel-default-kgraft
kernel-docs
kernel-obs-build
cluster-md-kmp-default-debuginfo
ocfs2-kmp-default
kernel-syms
kernel-default-base
kernel-default-devel
dlm-kmp-default
ocfs2-kmp-default-debuginfo
kernel-default-debugsource
gfs2-kmp-default-debuginfo
gfs2-kmp-default
dlm-kmp-default-debuginfo
kernel-default-base-debuginfo
kernel-default-debuginfo
kernel-default-man
kernel-default-extra
kernel-debuginfo
kernel
bpftool
kernel-tools-debuginfo
bpftool-debuginfo
kernel-tools
python3-perf-debuginfo
perf-debuginfo
kernel-tools-devel
perf
python2-perf
kernel-debugsource
python2-perf-debuginfo
python3-perf
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
dlm-kmp-preempt
kernel-64kb-debugsource
kernel-64kb
kernel-64kb-devel
dtb-lg
dtb-aarch64
dtb-qcom
dtb-sprd
dtb-renesas
dtb-freescale
kselftests-kmp-64kb
dtb-allwinner
dtb-hisilicon
gfs2-kmp-64kb-debuginfo
kernel-zfcpdump-debugsource
dtb-altera
dtb-amd
dtb-exynos
dtb-xilinx
kselftests-kmp-64kb-debuginfo
dtb-al
dtb-broadcom
cluster-md-kmp-64kb
kselftests-kmp-preempt
kernel-preempt-optional
reiserfs-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
reiserfs-kmp-preempt-debuginfo
gfs2-kmp-preempt
kernel-preempt-livepatch-devel
cluster-md-kmp-preempt
ocfs2-kmp-preempt-debuginfo
kselftests-kmp-preempt-debuginfo
kernel-zfcpdump
kernel-zfcpdump-debuginfo
cluster-md-kmp-64kb-debuginfo
dlm-kmp-64kb
dtb-apm
dtb-nvidia
dtb-amlogic
dlm-kmp-preempt-debuginfo
kernel-64kb-optional-debuginfo
kernel-obs-qa
kernel-default-optional-debuginfo
kernel-default-optional
kselftests-kmp-default-debuginfo
reiserfs-kmp-64kb
reiserfs-kmp-64kb-debuginfo
dtb-socionext
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
ocfs2-kmp-64kb-debuginfo
kernel-default-base-rebuild
EMC Cloud Tiering Appliance

How to mitigate CVE-2021-47061

Install update from vendor's website.

Linux kernel - addressed in versions 5.10.37, 5.11.21, 5.12.4, 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-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
kernel-rt-devel-debuginfo - update to 4.12.14-10.182.1
kernel-rt-debuginfo - update to 4.12.14-10.182.1
kernel-syms-rt - update to 4.12.14-10.182.1
kernel-rt_debug-debugsource - update to 4.12.14-10.182.1
ocfs2-kmp-rt - update to 4.12.14-10.182.1
dlm-kmp-rt - update to 4.12.14-10.182.1
kernel-rt_debug-debuginfo - update to 4.12.14-10.182.1
cluster-md-kmp-rt-debuginfo - update to 4.12.14-10.182.1
kernel-rt-devel - update to 4.12.14-10.182.1
gfs2-kmp-rt - update to 4.12.14-10.182.1
cluster-md-kmp-rt - update to 4.12.14-10.182.1
kernel-rt-debugsource - 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-debuginfo - update to 4.12.14-10.182.1
ocfs2-kmp-rt-debuginfo - update to 4.12.14-10.182.1
kernel-rt_debug-devel-debuginfo - update to 4.12.14-10.182.1
kernel-rt_debug-devel - update to 4.12.14-10.182.1
kernel-devel-rt - update to 4.12.14-10.182.1
kernel-source-rt - update to 4.12.14-10.182.1
kernel-rt_debug - update to 4.12.14-10.182.1
kernel-rt - update to 4.12.14-10.182.1
kernel-azure - update to 4.12.14-16.182.1
kernel-devel-azure - update to 4.12.14-16.182.1
kernel-azure-base - update to 4.12.14-16.182.1
kernel-azure-devel - update to 4.12.14-16.182.1
kernel-azure-debugsource - update to 4.12.14-16.182.1
kernel-azure-debuginfo - update to 4.12.14-16.182.1
kernel-syms-azure - update to 4.12.14-16.182.1
kernel-azure-base-debuginfo - update to 4.12.14-16.182.1
kernel-source-azure - update to 4.12.14-16.182.1
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-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 - 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-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-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-extra-debuginfo - addressed in versions 4.12.14-122.212.1, 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
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
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
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
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-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
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
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
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
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
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
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
kernel-default-base-debuginfo - update to 4.12.14-122.212.1
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-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-debuginfo - addressed in versions 4.19.90-2404.2.0.0246, 4.19.90-2404.2.0.0273
kernel - addressed in versions 4.19.90-2404.2.0.0246, 4.19.90-2404.2.0.0273
kernel-devel - addressed in versions 4.19.90-2404.2.0.0246, 4.19.90-2404.2.0.0273
bpftool - addressed in versions 4.19.90-2404.2.0.0246, 4.19.90-2404.2.0.0273
kernel-tools-debuginfo - addressed in versions 4.19.90-2404.2.0.0246, 4.19.90-2404.2.0.0273
bpftool-debuginfo - addressed in versions 4.19.90-2404.2.0.0246, 4.19.90-2404.2.0.0273
kernel-tools - addressed in versions 4.19.90-2404.2.0.0246, 4.19.90-2404.2.0.0273
python3-perf-debuginfo - addressed in versions 4.19.90-2404.2.0.0246, 4.19.90-2404.2.0.0273
perf-debuginfo - addressed in versions 4.19.90-2404.2.0.0246, 4.19.90-2404.2.0.0273
kernel-tools-devel - addressed in versions 4.19.90-2404.2.0.0246, 4.19.90-2404.2.0.0273
perf - addressed in versions 4.19.90-2404.2.0.0246, 4.19.90-2404.2.0.0273
python2-perf - addressed in versions 4.19.90-2404.2.0.0246, 4.19.90-2404.2.0.0273
kernel-debugsource - addressed in versions 4.19.90-2404.2.0.0246, 4.19.90-2404.2.0.0273
python2-perf-debuginfo - addressed in versions 4.19.90-2404.2.0.0246, 4.19.90-2404.2.0.0273
kernel-source - addressed in versions 4.19.90-2404.2.0.0246, 4.19.90-2404.2.0.0273
python3-perf - addressed in versions 4.19.90-2404.2.0.0246, 4.19.90-2404.2.0.0273
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
dlm-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-lg - update to 5.3.18-150300.59.158.1
dtb-aarch64 - update to 5.3.18-150300.59.158.1
dtb-qcom - 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
kernel-zfcpdump-debugsource - update to 5.3.18-150300.59.158.1
dtb-altera - update to 5.3.18-150300.59.158.1
dtb-amd - 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
kselftests-kmp-preempt - update to 5.3.18-150300.59.158.1
kernel-preempt-optional - update to 5.3.18-150300.59.158.1
reiserfs-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
reiserfs-kmp-preempt-debuginfo - update to 5.3.18-150300.59.158.1
gfs2-kmp-preempt - 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
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-debuginfo - update to 5.3.18-150300.59.158.1
kernel-64kb-optional-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
reiserfs-kmp-64kb-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
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
ocfs2-kmp-64kb-debuginfo - 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
EMC Cloud Tiering Appliance - update to 13.2.0.2.29

External References

Related Security Bulletins