Out-of-bounds read in Linux kernel - CVE-2021-47126

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Main Vulnerability Database Vulnerabilities #VU90339

Out-of-bounds read in Linux kernel - CVE-2021-47126

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


Vulnerability identifier: #VU90339
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-2021-47126
CWE-ID: CWE-125
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 an out-of-bounds read error within the ip6_route_info_create() function in net/ipv6/route.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 Server 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise High Performance Computing LTSS 15
SUSE Manager Proxy
SUSE Manager Retail Branch Server
SUSE Manager Server
SUSE Linux Enterprise Micro
SUSE Linux Enterprise Micro for Rancher
SUSE Enterprise Storage
SUSE Linux Enterprise Server 15 SP2 LTSS
SUSE Linux Enterprise Server 15 SP2 Business Critical Linux
SUSE Linux Enterprise Live Patching
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
kernel-livepatch-SLE15-SP2_Update_51-debugsource
kernel-livepatch-5_3_18-150200_24_200-default
kernel-livepatch-5_3_18-150200_24_200-default-debuginfo
kernel-livepatch-5_3_18-150300_59_170-default-debuginfo
kernel-livepatch-5_3_18-150300_59_170-default
kernel-livepatch-SLE15-SP3_Update_47-debugsource
kernel-livepatch-5_3_18-150300_59_170-preempt
kernel-livepatch-5_3_18-150300_59_170-preempt-debuginfo
kernel-default-devel-debuginfo
kernel-devel
kernel-preempt-debuginfo
kernel-preempt-devel
kernel-syms
kernel-preempt-debugsource
kernel-default-devel
kernel-obs-build-debugsource
kernel-macros
kernel-source
kernel-docs
reiserfs-kmp-default-debuginfo
reiserfs-kmp-default
kernel-preempt-devel-debuginfo
kernel-default-debugsource
kernel-default-livepatch-devel
kernel-default
kernel-default-livepatch
kernel-default-debuginfo
dlm-kmp-default
kernel-obs-build
gfs2-kmp-default
cluster-md-kmp-default
ocfs2-kmp-default-debuginfo
gfs2-kmp-default-debuginfo
ocfs2-kmp-default
cluster-md-kmp-default-debuginfo
dlm-kmp-default-debuginfo
kernel-preempt
kernel-default-base
dtb-renesas
dtb-aarch64
dtb-mediatek
dlm-kmp-64kb
kernel-zfcpdump-debugsource
dtb-qcom
dtb-lg
dtb-broadcom
kernel-64kb-livepatch-devel
dtb-socionext
dtb-apm
dtb-nvidia
dtb-zte
ocfs2-kmp-64kb
kernel-zfcpdump-debuginfo
kernel-zfcpdump
kernel-preempt-livepatch-devel
kernel-preempt-extra-debuginfo
kselftests-kmp-preempt-debuginfo
reiserfs-kmp-preempt-debuginfo
ocfs2-kmp-preempt-debuginfo
dlm-kmp-preempt
kernel-preempt-optional-debuginfo
ocfs2-kmp-preempt
cluster-md-kmp-preempt
gfs2-kmp-preempt
gfs2-kmp-64kb-debuginfo
dtb-arm
dtb-xilinx
dtb-altera
dtb-amlogic
reiserfs-kmp-64kb
cluster-md-kmp-64kb-debuginfo
cluster-md-kmp-64kb
kernel-64kb-devel-debuginfo
dtb-marvell
kernel-64kb-optional
kernel-64kb-extra-debuginfo
dtb-sprd
dlm-kmp-64kb-debuginfo
ocfs2-kmp-64kb-debuginfo
kernel-64kb-devel
kernel-64kb
dtb-exynos
dtb-amd
kernel-64kb-extra
kernel-64kb-debugsource
dtb-allwinner
dtb-al
gfs2-kmp-64kb
dtb-freescale
dtb-cavium
kselftests-kmp-64kb-debuginfo
reiserfs-kmp-64kb-debuginfo
kernel-64kb-optional-debuginfo
kernel-64kb-debuginfo
dtb-hisilicon
kselftests-kmp-64kb
dtb-rockchip
kernel-debug-debugsource
kernel-default-extra
kselftests-kmp-default-debuginfo
kernel-default-extra-debuginfo
kernel-default-optional
kernel-kvmsmall-debuginfo
kernel-debug-devel
kernel-debug-devel-debuginfo
kernel-kvmsmall-livepatch-devel
kernel-kvmsmall-devel-debuginfo
kernel-debug-livepatch-devel
kernel-kvmsmall-debugsource
kernel-debug-debuginfo
kernel-kvmsmall-devel
kernel-debug
kernel-kvmsmall
kernel-source-vanilla
reiserfs-kmp-preempt
kernel-preempt-optional
gfs2-kmp-preempt-debuginfo
kselftests-kmp-preempt
kernel-preempt-extra
cluster-md-kmp-preempt-debuginfo
dlm-kmp-preempt-debuginfo
kernel-default-optional-debuginfo
kernel-obs-qa
kselftests-kmp-default
kernel-default-base-rebuild
kernel-docs-html
kernel-rt
kernel-source-rt
kernel-rt-debuginfo
kernel-rt-debugsource
PowerStore T

How to mitigate CVE-2021-47126

Install update from vendor's website.

Linux kernel - addressed in versions 5.4.125, 5.10.43, 5.12.10, 5.13
kernel-livepatch-SLE15-SP2_Update_51-debugsource - update to 1-150200.5.3.1
kernel-livepatch-5_3_18-150200_24_200-default - update to 1-150200.5.3.1
kernel-livepatch-5_3_18-150200_24_200-default-debuginfo - update to 1-150200.5.3.1
kernel-livepatch-5_3_18-150300_59_170-default-debuginfo - update to 1-150300.7.3.1
kernel-livepatch-5_3_18-150300_59_170-default - update to 1-150300.7.3.1
kernel-livepatch-SLE15-SP3_Update_47-debugsource - update to 1-150300.7.3.1
kernel-livepatch-5_3_18-150300_59_170-preempt - update to 1-150300.7.3.1
kernel-livepatch-5_3_18-150300_59_170-preempt-debuginfo - update to 1-150300.7.3.1
PowerStore T - update to 3.6.1.4-2413340
kernel-default-devel-debuginfo - addressed in versions 5.3.18-150200.24.200.1, 5.3.18-150300.59.170.1
kernel-devel - addressed in versions 5.3.18-150200.24.200.1, 5.3.18-150300.59.170.1
kernel-preempt-debuginfo - addressed in versions 5.3.18-150200.24.200.1, 5.3.18-150300.59.170.1
kernel-preempt-devel - addressed in versions 5.3.18-150200.24.200.1, 5.3.18-150300.59.170.1
kernel-syms - addressed in versions 5.3.18-150200.24.200.1, 5.3.18-150300.59.170.1
kernel-preempt-debugsource - addressed in versions 5.3.18-150200.24.200.1, 5.3.18-150300.59.170.1
kernel-default-devel - addressed in versions 5.3.18-150200.24.200.1, 5.3.18-150300.59.170.1
kernel-obs-build-debugsource - addressed in versions 5.3.18-150200.24.200.1, 5.3.18-150300.59.170.1
kernel-macros - addressed in versions 5.3.18-150200.24.200.1, 5.3.18-150300.59.170.1
kernel-source - addressed in versions 5.3.18-150200.24.200.1, 5.3.18-150300.59.170.1
kernel-docs - addressed in versions 5.3.18-150200.24.200.1, 5.3.18-150300.59.170.2
reiserfs-kmp-default-debuginfo - addressed in versions 5.3.18-150200.24.200.1, 5.3.18-150300.59.170.1
reiserfs-kmp-default - addressed in versions 5.3.18-150200.24.200.1, 5.3.18-150300.59.170.1
kernel-preempt-devel-debuginfo - addressed in versions 5.3.18-150200.24.200.1, 5.3.18-150300.59.170.1
kernel-default-debugsource - addressed in versions 5.3.18-150200.24.200.1, 5.3.18-150300.59.170.1
kernel-default-livepatch-devel - addressed in versions 5.3.18-150200.24.200.1, 5.3.18-150300.59.170.1
kernel-default - addressed in versions 5.3.18-150200.24.200.1, 5.3.18-150300.59.170.1
kernel-default-livepatch - addressed in versions 5.3.18-150200.24.200.1, 5.3.18-150300.59.170.1
kernel-default-debuginfo - addressed in versions 5.3.18-150200.24.200.1, 5.3.18-150300.59.170.1
dlm-kmp-default - addressed in versions 5.3.18-150200.24.200.1, 5.3.18-150300.59.170.1
kernel-obs-build - addressed in versions 5.3.18-150200.24.200.1, 5.3.18-150300.59.170.1
gfs2-kmp-default - addressed in versions 5.3.18-150200.24.200.1, 5.3.18-150300.59.170.1
cluster-md-kmp-default - addressed in versions 5.3.18-150200.24.200.1, 5.3.18-150300.59.170.1
ocfs2-kmp-default-debuginfo - addressed in versions 5.3.18-150200.24.200.1, 5.3.18-150300.59.170.1
gfs2-kmp-default-debuginfo - addressed in versions 5.3.18-150200.24.200.1, 5.3.18-150300.59.170.1
ocfs2-kmp-default - addressed in versions 5.3.18-150200.24.200.1, 5.3.18-150300.59.170.1
cluster-md-kmp-default-debuginfo - addressed in versions 5.3.18-150200.24.200.1, 5.3.18-150300.59.170.1
dlm-kmp-default-debuginfo - addressed in versions 5.3.18-150200.24.200.1, 5.3.18-150300.59.170.1
kernel-preempt - addressed in versions 5.3.18-150200.24.200.1, 5.3.18-150300.59.170.1
kernel-default-base - addressed in versions 5.3.18-150200.24.200.1.150200.9.103.1, 5.3.18-150300.59.170.1.150300.18.100.1
dtb-renesas - update to 5.3.18-150300.59.170.1
dtb-aarch64 - update to 5.3.18-150300.59.170.1
dtb-mediatek - update to 5.3.18-150300.59.170.1
dlm-kmp-64kb - update to 5.3.18-150300.59.170.1
kernel-zfcpdump-debugsource - update to 5.3.18-150300.59.170.1
dtb-qcom - update to 5.3.18-150300.59.170.1
dtb-lg - update to 5.3.18-150300.59.170.1
dtb-broadcom - update to 5.3.18-150300.59.170.1
kernel-64kb-livepatch-devel - update to 5.3.18-150300.59.170.1
dtb-socionext - update to 5.3.18-150300.59.170.1
dtb-apm - update to 5.3.18-150300.59.170.1
dtb-nvidia - update to 5.3.18-150300.59.170.1
dtb-zte - update to 5.3.18-150300.59.170.1
ocfs2-kmp-64kb - update to 5.3.18-150300.59.170.1
kernel-zfcpdump-debuginfo - update to 5.3.18-150300.59.170.1
kernel-zfcpdump - update to 5.3.18-150300.59.170.1
kernel-preempt-livepatch-devel - update to 5.3.18-150300.59.170.1
kernel-preempt-extra-debuginfo - update to 5.3.18-150300.59.170.1
kselftests-kmp-preempt-debuginfo - update to 5.3.18-150300.59.170.1
reiserfs-kmp-preempt-debuginfo - update to 5.3.18-150300.59.170.1
ocfs2-kmp-preempt-debuginfo - update to 5.3.18-150300.59.170.1
dlm-kmp-preempt - update to 5.3.18-150300.59.170.1
kernel-preempt-optional-debuginfo - update to 5.3.18-150300.59.170.1
ocfs2-kmp-preempt - update to 5.3.18-150300.59.170.1
cluster-md-kmp-preempt - update to 5.3.18-150300.59.170.1
gfs2-kmp-preempt - update to 5.3.18-150300.59.170.1
gfs2-kmp-64kb-debuginfo - update to 5.3.18-150300.59.170.1
dtb-arm - update to 5.3.18-150300.59.170.1
dtb-xilinx - update to 5.3.18-150300.59.170.1
dtb-altera - update to 5.3.18-150300.59.170.1
dtb-amlogic - update to 5.3.18-150300.59.170.1
reiserfs-kmp-64kb - update to 5.3.18-150300.59.170.1
cluster-md-kmp-64kb-debuginfo - update to 5.3.18-150300.59.170.1
cluster-md-kmp-64kb - update to 5.3.18-150300.59.170.1
kernel-64kb-devel-debuginfo - update to 5.3.18-150300.59.170.1
dtb-marvell - update to 5.3.18-150300.59.170.1
kernel-64kb-optional - update to 5.3.18-150300.59.170.1
kernel-64kb-extra-debuginfo - update to 5.3.18-150300.59.170.1
dtb-sprd - update to 5.3.18-150300.59.170.1
dlm-kmp-64kb-debuginfo - update to 5.3.18-150300.59.170.1
ocfs2-kmp-64kb-debuginfo - update to 5.3.18-150300.59.170.1
kernel-64kb-devel - update to 5.3.18-150300.59.170.1
kernel-64kb - update to 5.3.18-150300.59.170.1
dtb-exynos - update to 5.3.18-150300.59.170.1
dtb-amd - update to 5.3.18-150300.59.170.1
kernel-64kb-extra - update to 5.3.18-150300.59.170.1
kernel-64kb-debugsource - update to 5.3.18-150300.59.170.1
dtb-allwinner - update to 5.3.18-150300.59.170.1
dtb-al - update to 5.3.18-150300.59.170.1
gfs2-kmp-64kb - update to 5.3.18-150300.59.170.1
dtb-freescale - update to 5.3.18-150300.59.170.1
dtb-cavium - update to 5.3.18-150300.59.170.1
kselftests-kmp-64kb-debuginfo - update to 5.3.18-150300.59.170.1
reiserfs-kmp-64kb-debuginfo - update to 5.3.18-150300.59.170.1
kernel-64kb-optional-debuginfo - update to 5.3.18-150300.59.170.1
kernel-64kb-debuginfo - update to 5.3.18-150300.59.170.1
dtb-hisilicon - update to 5.3.18-150300.59.170.1
kselftests-kmp-64kb - update to 5.3.18-150300.59.170.1
dtb-rockchip - update to 5.3.18-150300.59.170.1
kernel-debug-debugsource - update to 5.3.18-150300.59.170.1
kernel-default-extra - update to 5.3.18-150300.59.170.1
kselftests-kmp-default-debuginfo - update to 5.3.18-150300.59.170.1
kernel-default-extra-debuginfo - update to 5.3.18-150300.59.170.1
kernel-default-optional - update to 5.3.18-150300.59.170.1
kernel-kvmsmall-debuginfo - update to 5.3.18-150300.59.170.1
kernel-debug-devel - update to 5.3.18-150300.59.170.1
kernel-debug-devel-debuginfo - update to 5.3.18-150300.59.170.1
kernel-kvmsmall-livepatch-devel - update to 5.3.18-150300.59.170.1
kernel-kvmsmall-devel-debuginfo - update to 5.3.18-150300.59.170.1
kernel-debug-livepatch-devel - update to 5.3.18-150300.59.170.1
kernel-kvmsmall-debugsource - update to 5.3.18-150300.59.170.1
kernel-debug-debuginfo - update to 5.3.18-150300.59.170.1
kernel-kvmsmall-devel - update to 5.3.18-150300.59.170.1
kernel-debug - update to 5.3.18-150300.59.170.1
kernel-kvmsmall - update to 5.3.18-150300.59.170.1
kernel-source-vanilla - update to 5.3.18-150300.59.170.1
reiserfs-kmp-preempt - update to 5.3.18-150300.59.170.1
kernel-preempt-optional - update to 5.3.18-150300.59.170.1
gfs2-kmp-preempt-debuginfo - update to 5.3.18-150300.59.170.1
kselftests-kmp-preempt - update to 5.3.18-150300.59.170.1
kernel-preempt-extra - update to 5.3.18-150300.59.170.1
cluster-md-kmp-preempt-debuginfo - update to 5.3.18-150300.59.170.1
dlm-kmp-preempt-debuginfo - update to 5.3.18-150300.59.170.1
kernel-default-optional-debuginfo - update to 5.3.18-150300.59.170.1
kernel-obs-qa - update to 5.3.18-150300.59.170.1
kselftests-kmp-default - update to 5.3.18-150300.59.170.1
kernel-default-base-rebuild - update to 5.3.18-150300.59.170.1.150300.18.100.1
kernel-docs-html - update to 5.3.18-150300.59.170.2
kernel-rt - update to 5.3.18-150300.178.1
kernel-source-rt - update to 5.3.18-150300.178.1
kernel-rt-debuginfo - update to 5.3.18-150300.178.1
kernel-rt-debugsource - update to 5.3.18-150300.178.1

External References

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