NULL pointer dereference in Linux kernel - CVE-2021-47515

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Main Vulnerability Database Vulnerabilities #VU90391

NULL pointer dereference in Linux kernel - CVE-2021-47515

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


Vulnerability identifier: #VU90391
CSH Severity: Low
CVSS v4 BT: 4.3 [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/E:U/U:Clear]
CVE-ID: CVE-2021-47515
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 seg6_do_srh_encap() function in net/ipv6/seg6_iptunnel.c. A local user can perform a denial of service (DoS) attack.


Affected software

Linux kernel
SUSE Linux Enterprise Workstation Extension 15
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 for SAP Applications 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Micro
openSUSE Leap Micro
SUSE Linux Enterprise Live Patching
Basesystem Module
Legacy Module
Development Tools Module
SUSE Real Time Module
Public Cloud Module
openSUSE Leap
openEuler
kernel-livepatch-5_14_21-150500_55_73-default-debuginfo
kernel-livepatch-5_14_21-150500_13_61-rt
kernel-livepatch-5_14_21-150500_13_61-rt-debuginfo
kernel-livepatch-SLE15-SP5-RT_Update_17-debugsource
kernel-livepatch-5_14_21-150500_55_73-default
kernel-livepatch-SLE15-SP5_Update_17-debugsource
kernel-source
bpftool
kernel
bpftool-debuginfo
kernel-debuginfo
kernel-debugsource
kernel-devel
python3-perf-debuginfo
kernel-tools
kernel-tools-debuginfo
kernel-tools-devel
perf
perf-debuginfo
python2-perf
python2-perf-debuginfo
python3-perf
kernel-rt-debugsource
kernel-rt_debug-vdso-debuginfo
kernel-rt_debug
kernel-rt_debug-devel
ocfs2-kmp-rt-debuginfo
kselftests-kmp-rt
kernel-rt-livepatch
gfs2-kmp-rt-debuginfo
kernel-rt-extra-debuginfo
kernel-rt-vdso
kernel-rt-vdso-debuginfo
reiserfs-kmp-rt
kernel-rt_debug-debugsource
kernel-rt_debug-livepatch-devel
ocfs2-kmp-rt
kernel-rt_debug-debuginfo
kernel-rt-livepatch-devel
kernel-rt-extra
kernel-rt-devel
cluster-md-kmp-rt-debuginfo
gfs2-kmp-rt
kernel-rt
kernel-rt-optional
kernel-devel-rt
kernel-source-rt
kselftests-kmp-rt-debuginfo
reiserfs-kmp-rt-debuginfo
cluster-md-kmp-rt
kernel-rt_debug-devel-debuginfo
kernel-rt-devel-debuginfo
kernel-rt_debug-vdso
kernel-syms-rt
dlm-kmp-rt-debuginfo
dlm-kmp-rt
kernel-rt-optional-debuginfo
kernel-rt-debuginfo
gfs2-kmp-azure
kernel-azure-optional
dlm-kmp-azure-debuginfo
kernel-azure-extra-debuginfo
ocfs2-kmp-azure
kselftests-kmp-azure-debuginfo
kernel-source-azure
kernel-devel-azure
kernel-azure-debuginfo
kernel-azure-debugsource
kernel-azure
kernel-azure-devel
kernel-syms-azure
kernel-azure-devel-debuginfo
cluster-md-kmp-azure-debuginfo
cluster-md-kmp-azure
dlm-kmp-azure
kernel-azure-vdso
kernel-azure-vdso-debuginfo
kernel-azure-optional-debuginfo
ocfs2-kmp-azure-debuginfo
gfs2-kmp-azure-debuginfo
reiserfs-kmp-azure
reiserfs-kmp-azure-debuginfo
kernel-azure-livepatch-devel
kernel-azure-extra
kselftests-kmp-azure
ocfs2-kmp-64kb
reiserfs-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
kernel-64kb-extra
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
kernel-64kb
dtb-broadcom
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
dtb-qcom
ocfs2-kmp-64kb-debuginfo
dtb-altera
dtb-mediatek
dtb-arm
dtb-amlogic
dtb-apm
dtb-amd
dtb-apple
dtb-cavium
dtb-socionext
dtb-nvidia
cluster-md-kmp-64kb-debuginfo
kernel-kvmsmall-vdso
gfs2-kmp-default
ocfs2-kmp-default
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-vdso
kernel-default
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-macros
kernel-syms
kernel-kvmsmall
kernel-default-debuginfo
kernel-obs-build-debugsource
kernel-default-livepatch
kernel-obs-build
reiserfs-kmp-default
kernel-default-extra-debuginfo
reiserfs-kmp-default-debuginfo
kernel-default-extra
cluster-md-kmp-default
kernel-default-devel
ocfs2-kmp-default-debuginfo
kernel-default-debugsource
dlm-kmp-default-debuginfo
cluster-md-kmp-default-debuginfo
kernel-default-optional-debuginfo
kernel-obs-qa
dlm-kmp-default
gfs2-kmp-default-debuginfo
kernel-default-optional
kernel-default-devel-debuginfo
kselftests-kmp-default-debuginfo
kernel-default-livepatch-devel
kernel-default-base
kernel-default-base-rebuild
kernel-docs-html
kernel-docs

How to mitigate CVE-2021-47515

Install update from vendor's website.

Linux kernel - addressed in versions 4.14.258, 4.19.221, 5.4.165, 5.10.85, 5.15.8, 5.16
kernel-livepatch-5_14_21-150500_55_73-default-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-livepatch-5_14_21-150500_13_61-rt-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_55_73-default - update to 1-150500.11.3.1
kernel-livepatch-SLE15-SP5_Update_17-debugsource - update to 1-150500.11.3.1
kernel-source - update to 4.19.90-2407.3.0.0285
bpftool - update to 4.19.90-2407.3.0.0285
kernel - update to 4.19.90-2407.3.0.0285
bpftool-debuginfo - update to 4.19.90-2407.3.0.0285
kernel-debuginfo - update to 4.19.90-2407.3.0.0285
kernel-debugsource - update to 4.19.90-2407.3.0.0285
kernel-devel - update to 4.19.90-2407.3.0.0285
python3-perf-debuginfo - update to 4.19.90-2407.3.0.0285
kernel-tools - update to 4.19.90-2407.3.0.0285
kernel-tools-debuginfo - update to 4.19.90-2407.3.0.0285
kernel-tools-devel - update to 4.19.90-2407.3.0.0285
perf - update to 4.19.90-2407.3.0.0285
perf-debuginfo - update to 4.19.90-2407.3.0.0285
python2-perf - update to 4.19.90-2407.3.0.0285
python2-perf-debuginfo - update to 4.19.90-2407.3.0.0285
python3-perf - update to 4.19.90-2407.3.0.0285
kernel-rt-debugsource - update to 5.14.21-150500.13.61.1
kernel-rt_debug-vdso-debuginfo - update to 5.14.21-150500.13.61.1
kernel-rt_debug - update to 5.14.21-150500.13.61.1
kernel-rt_debug-devel - update to 5.14.21-150500.13.61.1
ocfs2-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-livepatch - update to 5.14.21-150500.13.61.1
gfs2-kmp-rt-debuginfo - update to 5.14.21-150500.13.61.1
kernel-rt-extra-debuginfo - update to 5.14.21-150500.13.61.1
kernel-rt-vdso - update to 5.14.21-150500.13.61.1
kernel-rt-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_debug-debugsource - update to 5.14.21-150500.13.61.1
kernel-rt_debug-livepatch-devel - update to 5.14.21-150500.13.61.1
ocfs2-kmp-rt - update to 5.14.21-150500.13.61.1
kernel-rt_debug-debuginfo - update to 5.14.21-150500.13.61.1
kernel-rt-livepatch-devel - update to 5.14.21-150500.13.61.1
kernel-rt-extra - update to 5.14.21-150500.13.61.1
kernel-rt-devel - update to 5.14.21-150500.13.61.1
cluster-md-kmp-rt-debuginfo - update to 5.14.21-150500.13.61.1
gfs2-kmp-rt - update to 5.14.21-150500.13.61.1
kernel-rt - update to 5.14.21-150500.13.61.1
kernel-rt-optional - update to 5.14.21-150500.13.61.1
kernel-devel-rt - update to 5.14.21-150500.13.61.1
kernel-source-rt - update to 5.14.21-150500.13.61.1
kselftests-kmp-rt-debuginfo - update to 5.14.21-150500.13.61.1
reiserfs-kmp-rt-debuginfo - update to 5.14.21-150500.13.61.1
cluster-md-kmp-rt - update to 5.14.21-150500.13.61.1
kernel-rt_debug-devel-debuginfo - update to 5.14.21-150500.13.61.1
kernel-rt-devel-debuginfo - update to 5.14.21-150500.13.61.1
kernel-rt_debug-vdso - update to 5.14.21-150500.13.61.1
kernel-syms-rt - update to 5.14.21-150500.13.61.1
dlm-kmp-rt-debuginfo - update to 5.14.21-150500.13.61.1
dlm-kmp-rt - update to 5.14.21-150500.13.61.1
kernel-rt-optional-debuginfo - update to 5.14.21-150500.13.61.1
kernel-rt-debuginfo - update to 5.14.21-150500.13.61.1
gfs2-kmp-azure - update to 5.14.21-150500.33.60.1
kernel-azure-optional - update to 5.14.21-150500.33.60.1
dlm-kmp-azure-debuginfo - update to 5.14.21-150500.33.60.1
kernel-azure-extra-debuginfo - update to 5.14.21-150500.33.60.1
ocfs2-kmp-azure - update to 5.14.21-150500.33.60.1
kselftests-kmp-azure-debuginfo - update to 5.14.21-150500.33.60.1
kernel-source-azure - update to 5.14.21-150500.33.60.1
kernel-devel-azure - update to 5.14.21-150500.33.60.1
kernel-azure-debuginfo - update to 5.14.21-150500.33.60.1
kernel-azure-debugsource - update to 5.14.21-150500.33.60.1
kernel-azure - update to 5.14.21-150500.33.60.1
kernel-azure-devel - update to 5.14.21-150500.33.60.1
kernel-syms-azure - 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
cluster-md-kmp-azure - update to 5.14.21-150500.33.60.1
dlm-kmp-azure - update to 5.14.21-150500.33.60.1
kernel-azure-vdso - update to 5.14.21-150500.33.60.1
kernel-azure-vdso-debuginfo - update to 5.14.21-150500.33.60.1
kernel-azure-optional-debuginfo - 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
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
kernel-azure-extra - update to 5.14.21-150500.33.60.1
kselftests-kmp-azure - update to 5.14.21-150500.33.60.1
ocfs2-kmp-64kb - update to 5.14.21-150500.55.73.1
reiserfs-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
kernel-64kb-extra - 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
kernel-64kb - update to 5.14.21-150500.55.73.1
dtb-broadcom - 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
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-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
cluster-md-kmp-64kb-debuginfo - update to 5.14.21-150500.55.73.1
kernel-kvmsmall-vdso - update to 5.14.21-150500.55.73.1
gfs2-kmp-default - update to 5.14.21-150500.55.73.1
ocfs2-kmp-default - 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-vdso - update to 5.14.21-150500.55.73.1
kernel-default - 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-devel - update to 5.14.21-150500.55.73.1
kernel-macros - update to 5.14.21-150500.55.73.1
kernel-source - update to 5.14.21-150500.55.73.1
kernel-syms - update to 5.14.21-150500.55.73.1
kernel-kvmsmall - update to 5.14.21-150500.55.73.1
kernel-default-debuginfo - update to 5.14.21-150500.55.73.1
kernel-obs-build-debugsource - update to 5.14.21-150500.55.73.1
kernel-default-livepatch - update to 5.14.21-150500.55.73.1
kernel-obs-build - update to 5.14.21-150500.55.73.1
reiserfs-kmp-default - update to 5.14.21-150500.55.73.1
kernel-default-extra-debuginfo - update to 5.14.21-150500.55.73.1
reiserfs-kmp-default-debuginfo - update to 5.14.21-150500.55.73.1
kernel-default-extra - update to 5.14.21-150500.55.73.1
cluster-md-kmp-default - update to 5.14.21-150500.55.73.1
kernel-default-devel - update to 5.14.21-150500.55.73.1
ocfs2-kmp-default-debuginfo - update to 5.14.21-150500.55.73.1
kernel-default-debugsource - update to 5.14.21-150500.55.73.1
dlm-kmp-default-debuginfo - update to 5.14.21-150500.55.73.1
cluster-md-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
dlm-kmp-default - update to 5.14.21-150500.55.73.1
gfs2-kmp-default-debuginfo - update to 5.14.21-150500.55.73.1
kernel-default-optional - update to 5.14.21-150500.55.73.1
kernel-default-devel-debuginfo - update to 5.14.21-150500.55.73.1
kselftests-kmp-default-debuginfo - update to 5.14.21-150500.55.73.1
kernel-default-livepatch-devel - update to 5.14.21-150500.55.73.1
kernel-default-base - update to 5.14.21-150500.55.73.1.150500.6.33.8
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
kernel-docs - update to 5.14.21-150500.55.73.2

External References

Related Security Bulletins