Buffer overflow in Linux kernel - CVE-2021-47566

CSH
CYBERSECURITY HELP
Sign In REGISTER
 
Main Vulnerability Database Vulnerabilities #VU93289

Buffer overflow in Linux kernel - CVE-2021-47566

Published: June 25, 2024 / Updated: May 13, 2025


Vulnerability identifier: #VU93289
CSH Severity: Low
CVSS v4: 8.5 [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]
CVE-ID: CVE-2021-47566
CWE-ID: CWE-119
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 memory corruption within the read_from_oldmem() function in fs/proc/vmcore.c. A local user can escalate privileges on the system.


Affected software

Linux kernel
SUSE Linux Enterprise Real Time 12
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise High Availability Extension 15
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Software Development Kit 12
SUSE Linux Enterprise Server for SAP Applications 12
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise High Performance Computing 12
SUSE Linux Enterprise High Availability Extension 12
SUSE Linux Enterprise Workstation Extension 15
SUSE Linux Enterprise Micro
openSUSE Leap Micro
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux Server - TUS
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Red Hat Enterprise Linux for x86_64 - Extended Update Support
Red Hat Enterprise Linux for ARM 64 - Extended Update Support
SUSE Linux Enterprise Workstation Extension 12
SUSE Linux Enterprise Live Patching
Legacy Module
Development Tools Module
Basesystem Module
SUSE Real Time Module
Public Cloud Module
openSUSE Leap
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
kgraft-patch-4_12_14-122_222-default
kernel-livepatch-SLE15-SP5_Update_17-debugsource
kernel-livepatch-5_14_21-150500_55_73-default
kernel-livepatch-5_14_21-150500_55_73-default-debuginfo
kernel-livepatch-SLE15-SP5-RT_Update_17-debugsource
kernel-livepatch-5_14_21-150500_13_61-rt-debuginfo
kernel-livepatch-5_14_21-150500_13_61-rt
kernel-rt-debugsource
kernel-source-rt
kernel-rt-base
kernel-rt_debug-debuginfo
kernel-rt_debug-debugsource
gfs2-kmp-rt
dlm-kmp-rt-debuginfo
kernel-rt-devel-debuginfo
kernel-rt-base-debuginfo
kernel-rt_debug-devel
cluster-md-kmp-rt
kernel-rt
kernel-rt_debug
kernel-devel-rt
kernel-rt-devel
ocfs2-kmp-rt-debuginfo
ocfs2-kmp-rt
kernel-rt_debug-devel-debuginfo
cluster-md-kmp-rt-debuginfo
kernel-syms-rt
kernel-rt-debuginfo
gfs2-kmp-rt-debuginfo
dlm-kmp-rt
kernel-azure-base
kernel-azure
kernel-azure-debuginfo
kernel-azure-devel
kernel-azure-base-debuginfo
kernel-syms-azure
kernel-azure-debugsource
kernel-devel-azure
kernel-source-azure
kernel-default-debugsource
kernel-default-extra-debuginfo
kernel-default-extra
kernel-default-man
kernel-obs-build
kernel-obs-build-debugsource
kernel-docs
kernel-default-kgraft
kernel-default-kgraft-devel
kernel-default-devel-debuginfo
kernel-macros
kernel-source
kernel-devel
kernel-default
kernel-default-base
ocfs2-kmp-default
dlm-kmp-default-debuginfo
gfs2-kmp-default
kernel-default-devel
kernel-syms
ocfs2-kmp-default-debuginfo
kernel-default-debuginfo
cluster-md-kmp-default
kernel-default-base-debuginfo
cluster-md-kmp-default-debuginfo
dlm-kmp-default
gfs2-kmp-default-debuginfo
kernel (Red Hat package)
kernel-rt_debug-vdso
kernel-rt_debug-vdso-debuginfo
reiserfs-kmp-rt
kernel-rt-optional
kernel-rt-optional-debuginfo
reiserfs-kmp-rt-debuginfo
kselftests-kmp-rt-debuginfo
kselftests-kmp-rt
kernel-rt-extra
kernel-rt-livepatch-devel
kernel-rt_debug-livepatch-devel
kernel-rt-vdso-debuginfo
kernel-rt-vdso
kernel-rt-extra-debuginfo
kernel-rt-livepatch
dlm-kmp-azure-debuginfo
kselftests-kmp-azure-debuginfo
ocfs2-kmp-azure
kernel-azure-extra-debuginfo
kernel-azure-optional
kernel-azure-devel-debuginfo
cluster-md-kmp-azure-debuginfo
kernel-azure-vdso-debuginfo
kernel-azure-vdso
dlm-kmp-azure
cluster-md-kmp-azure
gfs2-kmp-azure
kernel-azure-optional-debuginfo
kernel-azure-extra
reiserfs-kmp-azure
reiserfs-kmp-azure-debuginfo
kernel-azure-livepatch-devel
kselftests-kmp-azure
ocfs2-kmp-azure-debuginfo
gfs2-kmp-azure-debuginfo
kernel-64kb-extra
reiserfs-kmp-64kb
ocfs2-kmp-64kb
dtb-rockchip
dtb-renesas
dlm-kmp-64kb
reiserfs-kmp-64kb-debuginfo
kernel-64kb-debuginfo
kselftests-kmp-64kb
kernel-64kb-devel
kernel-64kb-livepatch-devel
kernel-64kb-debugsource
kernel-64kb-extra-debuginfo
cluster-md-kmp-64kb-debuginfo
dtb-allwinner
kernel-64kb-optional-debuginfo
gfs2-kmp-64kb
cluster-md-kmp-64kb
dtb-lg
dtb-xilinx
dtb-aarch64
kernel-zfcpdump-debuginfo
kernel-zfcpdump-debugsource
kernel-zfcpdump
dtb-qcom
ocfs2-kmp-64kb-debuginfo
dtb-freescale
dtb-exynos
dlm-kmp-64kb-debuginfo
kernel-64kb-devel-debuginfo
gfs2-kmp-64kb-debuginfo
dtb-marvell
dtb-hisilicon
dtb-sprd
dtb-amazon
kselftests-kmp-64kb-debuginfo
kernel-64kb-optional
kernel-64kb
dtb-broadcom
dtb-altera
dtb-mediatek
dtb-arm
dtb-amlogic
dtb-apm
dtb-amd
dtb-apple
dtb-cavium
dtb-socionext
dtb-nvidia
kernel-default-vdso
kselftests-kmp-default
kernel-kvmsmall-devel-debuginfo
kernel-kvmsmall-debuginfo
kernel-kvmsmall-livepatch-devel
kernel-kvmsmall-devel
kernel-kvmsmall-debugsource
kernel-debug-vdso-debuginfo
kernel-debug-vdso
kernel-default-vdso-debuginfo
kernel-default-livepatch-devel
kernel-kvmsmall-vdso
kernel-kvmsmall-vdso-debuginfo
kernel-debug-devel-debuginfo
kernel-debug-devel
kernel-debug-debugsource
kernel-debug-debuginfo
kernel-debug-livepatch-devel
kernel-debug
kernel-source-vanilla
kernel-kvmsmall
kernel-default-livepatch
reiserfs-kmp-default
reiserfs-kmp-default-debuginfo
kernel-default-optional-debuginfo
kernel-obs-qa
kernel-default-optional
kselftests-kmp-default-debuginfo
kernel-default-base-rebuild
kernel-docs-html

How to mitigate CVE-2021-47566

Install update from vendor's website.

Linux kernel - addressed in versions 4.4.294, 4.9.292, 4.14.257, 4.19.219, 5.4.163, 5.10.83, 5.15.6, 5.16
kgraft-patch-4_12_14-122_222-default - update to 1-8.3.1
kernel-livepatch-SLE15-SP5_Update_17-debugsource - update to 1-150500.11.3.1
kernel-livepatch-5_14_21-150500_55_73-default - update to 1-150500.11.3.1
kernel-livepatch-5_14_21-150500_55_73-default-debuginfo - update to 1-150500.11.3.1
kernel-livepatch-SLE15-SP5-RT_Update_17-debugsource - update to 1-150500.11.3.1
kernel-livepatch-5_14_21-150500_13_61-rt-debuginfo - update to 1-150500.11.3.1
kernel-livepatch-5_14_21-150500_13_61-rt - update to 1-150500.11.3.1
kernel-rt-debugsource - addressed in versions 4.12.14-10.191.1, 5.14.21-150500.13.61.1
kernel-source-rt - addressed in versions 4.12.14-10.191.1, 5.14.21-150500.13.61.1
kernel-rt-base - update to 4.12.14-10.191.1
kernel-rt_debug-debuginfo - addressed in versions 4.12.14-10.191.1, 5.14.21-150500.13.61.1
kernel-rt_debug-debugsource - addressed in versions 4.12.14-10.191.1, 5.14.21-150500.13.61.1
gfs2-kmp-rt - addressed in versions 4.12.14-10.191.1, 5.14.21-150500.13.61.1
dlm-kmp-rt-debuginfo - addressed in versions 4.12.14-10.191.1, 5.14.21-150500.13.61.1
kernel-rt-devel-debuginfo - addressed in versions 4.12.14-10.191.1, 5.14.21-150500.13.61.1
kernel-rt-base-debuginfo - update to 4.12.14-10.191.1
kernel-rt_debug-devel - addressed in versions 4.12.14-10.191.1, 5.14.21-150500.13.61.1
cluster-md-kmp-rt - addressed in versions 4.12.14-10.191.1, 5.14.21-150500.13.61.1
kernel-rt - addressed in versions 4.12.14-10.191.1, 5.14.21-150500.13.61.1
kernel-rt_debug - addressed in versions 4.12.14-10.191.1, 5.14.21-150500.13.61.1
kernel-devel-rt - addressed in versions 4.12.14-10.191.1, 5.14.21-150500.13.61.1
kernel-rt-devel - addressed in versions 4.12.14-10.191.1, 5.14.21-150500.13.61.1
ocfs2-kmp-rt-debuginfo - addressed in versions 4.12.14-10.191.1, 5.14.21-150500.13.61.1
ocfs2-kmp-rt - addressed in versions 4.12.14-10.191.1, 5.14.21-150500.13.61.1
kernel-rt_debug-devel-debuginfo - addressed in versions 4.12.14-10.191.1, 5.14.21-150500.13.61.1
cluster-md-kmp-rt-debuginfo - addressed in versions 4.12.14-10.191.1, 5.14.21-150500.13.61.1
kernel-syms-rt - addressed in versions 4.12.14-10.191.1, 5.14.21-150500.13.61.1
kernel-rt-debuginfo - addressed in versions 4.12.14-10.191.1, 5.14.21-150500.13.61.1
gfs2-kmp-rt-debuginfo - addressed in versions 4.12.14-10.191.1, 5.14.21-150500.13.61.1
dlm-kmp-rt - addressed in versions 4.12.14-10.191.1, 5.14.21-150500.13.61.1
kernel-azure-base - update to 4.12.14-16.191.1
kernel-azure - addressed in versions 4.12.14-16.191.1, 5.14.21-150500.33.60.1
kernel-azure-debuginfo - addressed in versions 4.12.14-16.191.1, 5.14.21-150500.33.60.1
kernel-azure-devel - addressed in versions 4.12.14-16.191.1, 5.14.21-150500.33.60.1
kernel-azure-base-debuginfo - update to 4.12.14-16.191.1
kernel-syms-azure - addressed in versions 4.12.14-16.191.1, 5.14.21-150500.33.60.1
kernel-azure-debugsource - addressed in versions 4.12.14-16.191.1, 5.14.21-150500.33.60.1
kernel-devel-azure - addressed in versions 4.12.14-16.191.1, 5.14.21-150500.33.60.1
kernel-source-azure - addressed in versions 4.12.14-16.191.1, 5.14.21-150500.33.60.1
kernel-default-debugsource - addressed in versions 4.12.14-122.222.1, 5.14.21-150500.55.73.1
kernel-default-extra-debuginfo - addressed in versions 4.12.14-122.222.1, 5.14.21-150500.55.73.1
kernel-default-extra - addressed in versions 4.12.14-122.222.1, 5.14.21-150500.55.73.1
kernel-default-man - update to 4.12.14-122.222.1
kernel-obs-build - addressed in versions 4.12.14-122.222.1, 5.14.21-150500.55.73.1
kernel-obs-build-debugsource - addressed in versions 4.12.14-122.222.1, 5.14.21-150500.55.73.1
kernel-docs - addressed in versions 4.12.14-122.222.1, 5.14.21-150500.55.73.2
kernel-default-kgraft - update to 4.12.14-122.222.1
kernel-default-kgraft-devel - update to 4.12.14-122.222.1
kernel-default-devel-debuginfo - addressed in versions 4.12.14-122.222.1, 5.14.21-150500.55.73.1
kernel-macros - addressed in versions 4.12.14-122.222.1, 5.14.21-150500.55.73.1
kernel-source - addressed in versions 4.12.14-122.222.1, 5.14.21-150500.55.73.1
kernel-devel - addressed in versions 4.12.14-122.222.1, 5.14.21-150500.55.73.1
kernel-default - addressed in versions 4.12.14-122.222.1, 5.14.21-150500.55.73.1
kernel-default-base - addressed in versions 4.12.14-122.222.1, 5.14.21-150500.55.73.1.150500.6.33.8
ocfs2-kmp-default - addressed in versions 4.12.14-122.222.1, 5.14.21-150500.55.73.1
dlm-kmp-default-debuginfo - addressed in versions 4.12.14-122.222.1, 5.14.21-150500.55.73.1
gfs2-kmp-default - addressed in versions 4.12.14-122.222.1, 5.14.21-150500.55.73.1
kernel-default-devel - addressed in versions 4.12.14-122.222.1, 5.14.21-150500.55.73.1
kernel-syms - addressed in versions 4.12.14-122.222.1, 5.14.21-150500.55.73.1
ocfs2-kmp-default-debuginfo - addressed in versions 4.12.14-122.222.1, 5.14.21-150500.55.73.1
kernel-default-debuginfo - addressed in versions 4.12.14-122.222.1, 5.14.21-150500.55.73.1
cluster-md-kmp-default - addressed in versions 4.12.14-122.222.1, 5.14.21-150500.55.73.1
kernel-default-base-debuginfo - update to 4.12.14-122.222.1
cluster-md-kmp-default-debuginfo - addressed in versions 4.12.14-122.222.1, 5.14.21-150500.55.73.1
dlm-kmp-default - addressed in versions 4.12.14-122.222.1, 5.14.21-150500.55.73.1
gfs2-kmp-default-debuginfo - addressed in versions 4.12.14-122.222.1, 5.14.21-150500.55.73.1
kernel (Red Hat package) - addressed in versions 4.18.0-372.118.1.el8_6, 4.18.0-477.74.1.el8_8
kernel-rt_debug-vdso - update to 5.14.21-150500.13.61.1
kernel-rt_debug-vdso-debuginfo - update to 5.14.21-150500.13.61.1
reiserfs-kmp-rt - update to 5.14.21-150500.13.61.1
kernel-rt-optional - update to 5.14.21-150500.13.61.1
kernel-rt-optional-debuginfo - update to 5.14.21-150500.13.61.1
reiserfs-kmp-rt-debuginfo - update to 5.14.21-150500.13.61.1
kselftests-kmp-rt-debuginfo - update to 5.14.21-150500.13.61.1
kselftests-kmp-rt - update to 5.14.21-150500.13.61.1
kernel-rt-extra - update to 5.14.21-150500.13.61.1
kernel-rt-livepatch-devel - update to 5.14.21-150500.13.61.1
kernel-rt_debug-livepatch-devel - update to 5.14.21-150500.13.61.1
kernel-rt-vdso-debuginfo - update to 5.14.21-150500.13.61.1
kernel-rt-vdso - update to 5.14.21-150500.13.61.1
kernel-rt-extra-debuginfo - update to 5.14.21-150500.13.61.1
kernel-rt-livepatch - update to 5.14.21-150500.13.61.1
dlm-kmp-azure-debuginfo - update to 5.14.21-150500.33.60.1
kselftests-kmp-azure-debuginfo - update to 5.14.21-150500.33.60.1
ocfs2-kmp-azure - update to 5.14.21-150500.33.60.1
kernel-azure-extra-debuginfo - update to 5.14.21-150500.33.60.1
kernel-azure-optional - update to 5.14.21-150500.33.60.1
kernel-azure-devel-debuginfo - update to 5.14.21-150500.33.60.1
cluster-md-kmp-azure-debuginfo - update to 5.14.21-150500.33.60.1
kernel-azure-vdso-debuginfo - update to 5.14.21-150500.33.60.1
kernel-azure-vdso - update to 5.14.21-150500.33.60.1
dlm-kmp-azure - update to 5.14.21-150500.33.60.1
cluster-md-kmp-azure - update to 5.14.21-150500.33.60.1
gfs2-kmp-azure - update to 5.14.21-150500.33.60.1
kernel-azure-optional-debuginfo - update to 5.14.21-150500.33.60.1
kernel-azure-extra - update to 5.14.21-150500.33.60.1
reiserfs-kmp-azure - update to 5.14.21-150500.33.60.1
reiserfs-kmp-azure-debuginfo - update to 5.14.21-150500.33.60.1
kernel-azure-livepatch-devel - update to 5.14.21-150500.33.60.1
kselftests-kmp-azure - update to 5.14.21-150500.33.60.1
ocfs2-kmp-azure-debuginfo - update to 5.14.21-150500.33.60.1
gfs2-kmp-azure-debuginfo - update to 5.14.21-150500.33.60.1
kernel-64kb-extra - update to 5.14.21-150500.55.73.1
reiserfs-kmp-64kb - update to 5.14.21-150500.55.73.1
ocfs2-kmp-64kb - update to 5.14.21-150500.55.73.1
dtb-rockchip - update to 5.14.21-150500.55.73.1
dtb-renesas - update to 5.14.21-150500.55.73.1
dlm-kmp-64kb - update to 5.14.21-150500.55.73.1
reiserfs-kmp-64kb-debuginfo - update to 5.14.21-150500.55.73.1
kernel-64kb-debuginfo - update to 5.14.21-150500.55.73.1
kselftests-kmp-64kb - update to 5.14.21-150500.55.73.1
kernel-64kb-devel - update to 5.14.21-150500.55.73.1
kernel-64kb-livepatch-devel - update to 5.14.21-150500.55.73.1
kernel-64kb-debugsource - update to 5.14.21-150500.55.73.1
kernel-64kb-extra-debuginfo - update to 5.14.21-150500.55.73.1
cluster-md-kmp-64kb-debuginfo - update to 5.14.21-150500.55.73.1
dtb-allwinner - update to 5.14.21-150500.55.73.1
kernel-64kb-optional-debuginfo - update to 5.14.21-150500.55.73.1
gfs2-kmp-64kb - update to 5.14.21-150500.55.73.1
cluster-md-kmp-64kb - update to 5.14.21-150500.55.73.1
dtb-lg - update to 5.14.21-150500.55.73.1
dtb-xilinx - update to 5.14.21-150500.55.73.1
dtb-aarch64 - update to 5.14.21-150500.55.73.1
kernel-zfcpdump-debuginfo - update to 5.14.21-150500.55.73.1
kernel-zfcpdump-debugsource - update to 5.14.21-150500.55.73.1
kernel-zfcpdump - update to 5.14.21-150500.55.73.1
dtb-qcom - update to 5.14.21-150500.55.73.1
ocfs2-kmp-64kb-debuginfo - update to 5.14.21-150500.55.73.1
dtb-freescale - update to 5.14.21-150500.55.73.1
dtb-exynos - update to 5.14.21-150500.55.73.1
dlm-kmp-64kb-debuginfo - update to 5.14.21-150500.55.73.1
kernel-64kb-devel-debuginfo - update to 5.14.21-150500.55.73.1
gfs2-kmp-64kb-debuginfo - update to 5.14.21-150500.55.73.1
dtb-marvell - update to 5.14.21-150500.55.73.1
dtb-hisilicon - update to 5.14.21-150500.55.73.1
dtb-sprd - update to 5.14.21-150500.55.73.1
dtb-amazon - update to 5.14.21-150500.55.73.1
kselftests-kmp-64kb-debuginfo - update to 5.14.21-150500.55.73.1
kernel-64kb-optional - update to 5.14.21-150500.55.73.1
kernel-64kb - update to 5.14.21-150500.55.73.1
dtb-broadcom - update to 5.14.21-150500.55.73.1
dtb-altera - update to 5.14.21-150500.55.73.1
dtb-mediatek - update to 5.14.21-150500.55.73.1
dtb-arm - update to 5.14.21-150500.55.73.1
dtb-amlogic - update to 5.14.21-150500.55.73.1
dtb-apm - update to 5.14.21-150500.55.73.1
dtb-amd - update to 5.14.21-150500.55.73.1
dtb-apple - update to 5.14.21-150500.55.73.1
dtb-cavium - update to 5.14.21-150500.55.73.1
dtb-socionext - update to 5.14.21-150500.55.73.1
dtb-nvidia - update to 5.14.21-150500.55.73.1
kernel-default-vdso - update to 5.14.21-150500.55.73.1
kselftests-kmp-default - update to 5.14.21-150500.55.73.1
kernel-kvmsmall-devel-debuginfo - update to 5.14.21-150500.55.73.1
kernel-kvmsmall-debuginfo - update to 5.14.21-150500.55.73.1
kernel-kvmsmall-livepatch-devel - update to 5.14.21-150500.55.73.1
kernel-kvmsmall-devel - update to 5.14.21-150500.55.73.1
kernel-kvmsmall-debugsource - update to 5.14.21-150500.55.73.1
kernel-debug-vdso-debuginfo - update to 5.14.21-150500.55.73.1
kernel-debug-vdso - update to 5.14.21-150500.55.73.1
kernel-default-vdso-debuginfo - update to 5.14.21-150500.55.73.1
kernel-default-livepatch-devel - update to 5.14.21-150500.55.73.1
kernel-kvmsmall-vdso - update to 5.14.21-150500.55.73.1
kernel-kvmsmall-vdso-debuginfo - update to 5.14.21-150500.55.73.1
kernel-debug-devel-debuginfo - update to 5.14.21-150500.55.73.1
kernel-debug-devel - update to 5.14.21-150500.55.73.1
kernel-debug-debugsource - update to 5.14.21-150500.55.73.1
kernel-debug-debuginfo - update to 5.14.21-150500.55.73.1
kernel-debug-livepatch-devel - update to 5.14.21-150500.55.73.1
kernel-debug - update to 5.14.21-150500.55.73.1
kernel-source-vanilla - update to 5.14.21-150500.55.73.1
kernel-kvmsmall - update to 5.14.21-150500.55.73.1
kernel-default-livepatch - update to 5.14.21-150500.55.73.1
reiserfs-kmp-default - update to 5.14.21-150500.55.73.1
reiserfs-kmp-default-debuginfo - update to 5.14.21-150500.55.73.1
kernel-default-optional-debuginfo - update to 5.14.21-150500.55.73.1
kernel-obs-qa - update to 5.14.21-150500.55.73.1
kernel-default-optional - update to 5.14.21-150500.55.73.1
kselftests-kmp-default-debuginfo - update to 5.14.21-150500.55.73.1
kernel-default-base-rebuild - update to 5.14.21-150500.55.73.1.150500.6.33.8
kernel-docs-html - update to 5.14.21-150500.55.73.2

External References

Related Security Bulletins