State Issues in Linux kernel - CVE-2021-47086

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Main Vulnerability Database Vulnerabilities #VU89260

State Issues in Linux kernel - CVE-2021-47086

Published: May 8, 2024 / Updated: May 14, 2025


Vulnerability identifier: #VU89260
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-2021-47086
CWE-ID: CWE-371
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 incorrect handling of the socket state within the pep_ioctl() function in net/phonet/pep.c. A local user can perform a denial of service (DoS) attack.


Affected software

Linux kernel
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise High Availability Extension 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise Workstation Extension 15
SUSE Linux Enterprise Micro
openSUSE Leap Micro
Ubuntu
SUSE Linux Enterprise Live Patching
Legacy Module
Development Tools Module
Basesystem Module
Public Cloud Module
SUSE Real Time Module
openSUSE Leap
openEuler
linux-image-virtual-lts-xenial (Ubuntu package)
linux-image-4.4.0-1140-kvm (Ubuntu package)
linux-image-4.4.0-1177-aws (Ubuntu package)
linux-image-aws (Ubuntu package)
linux-image-kvm (Ubuntu package)
linux-image-4.4.0-1139-aws (Ubuntu package)
linux-image-4.4.0-262-generic (Ubuntu package)
linux-image-4.4.0-262-lowlatency (Ubuntu package)
linux-image-generic (Ubuntu package)
linux-image-generic-lts-xenial (Ubuntu package)
linux-image-lowlatency (Ubuntu package)
linux-image-lowlatency-lts-xenial (Ubuntu package)
linux-image-virtual (Ubuntu package)
kernel-livepatch-SLE15-SP5-RT_Update_18-debugsource
kernel-livepatch-5_14_21-150500_13_64-rt-debuginfo
kernel-livepatch-5_14_21-150500_13_64-rt
kernel-livepatch-5_14_21-150500_55_73-default-debuginfo
kernel-livepatch-5_14_21-150500_55_73-default
kernel-livepatch-SLE15-SP5_Update_17-debugsource
kernel-debugsource
kernel
kernel-tools
kernel-devel
python2-perf
kernel-tools-debuginfo
python3-perf
bpftool
kernel-source
python3-perf-debuginfo
perf
python2-perf-debuginfo
kernel-debuginfo
kernel-tools-devel
perf-debuginfo
bpftool-debuginfo
kernel-rt-extra
ocfs2-kmp-rt-debuginfo
kselftests-kmp-rt
kernel-rt-extra-debuginfo
kernel-rt-vdso
kernel-rt_debug
kernel-rt
kernel-rt-livepatch
kernel-devel-rt
kernel-source-rt
ocfs2-kmp-rt
kernel-rt-debuginfo
gfs2-kmp-rt-debuginfo
kernel-rt_debug-vdso-debuginfo
reiserfs-kmp-rt-debuginfo
kernel-rt_debug-vdso
kernel-rt_debug-livepatch-devel
cluster-md-kmp-rt
kernel-rt_debug-debugsource
kernel-rt_debug-devel-debuginfo
kselftests-kmp-rt-debuginfo
kernel-rt-vdso-debuginfo
kernel-rt-devel
kernel-rt-devel-debuginfo
reiserfs-kmp-rt
cluster-md-kmp-rt-debuginfo
kernel-rt-optional-debuginfo
kernel-rt_debug-debuginfo
gfs2-kmp-rt
kernel-rt_debug-devel
kernel-syms-rt
kernel-rt-livepatch-devel
dlm-kmp-rt-debuginfo
kernel-rt-debugsource
kernel-rt-optional
dlm-kmp-rt
kernel-azure-extra
reiserfs-kmp-azure
kernel-azure-optional
kselftests-kmp-azure
kernel-azure-devel-debuginfo
dlm-kmp-azure-debuginfo
kselftests-kmp-azure-debuginfo
cluster-md-kmp-azure-debuginfo
kernel-azure-extra-debuginfo
dlm-kmp-azure
reiserfs-kmp-azure-debuginfo
kernel-azure-devel
ocfs2-kmp-azure
kernel-azure-optional-debuginfo
gfs2-kmp-azure
ocfs2-kmp-azure-debuginfo
cluster-md-kmp-azure
kernel-azure-debugsource
kernel-azure-debuginfo
kernel-devel-azure
kernel-source-azure
kernel-azure-vdso
kernel-azure-vdso-debuginfo
kernel-azure
kernel-azure-livepatch-devel
gfs2-kmp-azure-debuginfo
kernel-syms-azure
dtb-sprd
kernel-kvmsmall-vdso-debuginfo
dtb-amazon
kselftests-kmp-64kb-debuginfo
kernel-64kb-optional
dtb-qcom
dtb-broadcom
dtb-altera
dtb-mediatek
dtb-arm
dtb-amlogic
dtb-apm
dtb-amd
dtb-apple
dtb-cavium
dtb-socionext
dtb-nvidia
kernel-64kb
cluster-md-kmp-64kb-debuginfo
kernel-debug-debuginfo
kernel-debug-livepatch-devel
kernel-debug
kernel-source-vanilla
kernel-macros
dtb-hisilicon
ocfs2-kmp-64kb-debuginfo
dtb-freescale
dtb-exynos
dlm-kmp-64kb-debuginfo
kernel-64kb-devel-debuginfo
gfs2-kmp-64kb-debuginfo
dtb-marvell
kselftests-kmp-default-debuginfo
kernel-default-extra-debuginfo
reiserfs-kmp-64kb
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
reiserfs-kmp-default-debuginfo
kernel-syms
kernel-default-livepatch-devel
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-kvmsmall-vdso
kernel-64kb-optional-debuginfo
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
kernel-64kb-extra
dtb-allwinner
reiserfs-kmp-default
gfs2-kmp-64kb
kernel-debug-devel-debuginfo
kernel-obs-build
kernel-default-livepatch
kernel-obs-build-debugsource
kernel-default-debuginfo
kernel-default
kernel-kvmsmall
cluster-md-kmp-64kb
kernel-debug-devel
kernel-debug-debugsource
kernel-zfcpdump
kernel-zfcpdump-debugsource
kernel-zfcpdump-debuginfo
dtb-aarch64
dtb-xilinx
dtb-lg
kernel-default-base-rebuild
kernel-default-base
kernel-docs-html
kernel-docs

How to mitigate CVE-2021-47086

Install updates from vendor's website.

Linux kernel - addressed in versions 4.4.297, 4.9.295, 4.14.260, 4.19.223, 5.4.169, 5.10.89, 5.15.12, 5.16
linux-image-virtual-lts-xenial (Ubuntu package) - update to Ubuntu Pro (Infra-only)
linux-image-4.4.0-1140-kvm (Ubuntu package) - update to Ubuntu Pro
linux-image-4.4.0-1177-aws (Ubuntu package) - update to Ubuntu Pro
linux-image-aws (Ubuntu package) - update to Ubuntu Pro (Infra-only)
linux-image-kvm (Ubuntu package) - update to Ubuntu Pro (Infra-only)
linux-image-4.4.0-1139-aws (Ubuntu package) - update to linux-image-aws
linux-image-4.4.0-262-generic (Ubuntu package) - addressed in versions Ubuntu Pro, linux-image-4.4.0-262-lowlatency
linux-image-4.4.0-262-lowlatency (Ubuntu package) - update to Ubuntu Pro
linux-image-generic (Ubuntu package) - update to Ubuntu Pro (Infra-only)
linux-image-generic-lts-xenial (Ubuntu package) - addressed in versions Ubuntu Pro (Infra-only), linux-image-lowlatency-lts-xenial
linux-image-lowlatency (Ubuntu package) - update to Ubuntu Pro (Infra-only)
linux-image-lowlatency-lts-xenial (Ubuntu package) - update to Ubuntu Pro (Infra-only)
linux-image-virtual (Ubuntu package) - update to Ubuntu Pro (Infra-only)
kernel-livepatch-SLE15-SP5-RT_Update_18-debugsource - update to 1-150500.11.3.1
kernel-livepatch-5_14_21-150500_13_64-rt-debuginfo - update to 1-150500.11.3.1
kernel-livepatch-5_14_21-150500_13_64-rt - 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-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-debugsource - addressed in versions 4.19.90-2403.4.0.0271, 4.19.90-2404.1.0.0245
kernel - addressed in versions 4.19.90-2403.4.0.0271, 4.19.90-2404.1.0.0245
kernel-tools - addressed in versions 4.19.90-2403.4.0.0271, 4.19.90-2404.1.0.0245
kernel-devel - addressed in versions 4.19.90-2403.4.0.0271, 4.19.90-2404.1.0.0245
python2-perf - addressed in versions 4.19.90-2403.4.0.0271, 4.19.90-2404.1.0.0245
kernel-tools-debuginfo - addressed in versions 4.19.90-2403.4.0.0271, 4.19.90-2404.1.0.0245
python3-perf - addressed in versions 4.19.90-2403.4.0.0271, 4.19.90-2404.1.0.0245
bpftool - addressed in versions 4.19.90-2403.4.0.0271, 4.19.90-2404.1.0.0245
kernel-source - addressed in versions 4.19.90-2403.4.0.0271, 4.19.90-2404.1.0.0245
python3-perf-debuginfo - addressed in versions 4.19.90-2403.4.0.0271, 4.19.90-2404.1.0.0245
perf - addressed in versions 4.19.90-2403.4.0.0271, 4.19.90-2404.1.0.0245
python2-perf-debuginfo - addressed in versions 4.19.90-2403.4.0.0271, 4.19.90-2404.1.0.0245
kernel-debuginfo - addressed in versions 4.19.90-2403.4.0.0271, 4.19.90-2404.1.0.0245
kernel-tools-devel - addressed in versions 4.19.90-2403.4.0.0271, 4.19.90-2404.1.0.0245
perf-debuginfo - addressed in versions 4.19.90-2403.4.0.0271, 4.19.90-2404.1.0.0245
bpftool-debuginfo - addressed in versions 4.19.90-2403.4.0.0271, 4.19.90-2404.1.0.0245
kernel-rt-extra - update to 5.14.21-150500.13.64.1
ocfs2-kmp-rt-debuginfo - update to 5.14.21-150500.13.64.1
kselftests-kmp-rt - update to 5.14.21-150500.13.64.1
kernel-rt-extra-debuginfo - update to 5.14.21-150500.13.64.1
kernel-rt-vdso - update to 5.14.21-150500.13.64.1
kernel-rt_debug - update to 5.14.21-150500.13.64.1
kernel-rt - update to 5.14.21-150500.13.64.1
kernel-rt-livepatch - update to 5.14.21-150500.13.64.1
kernel-devel-rt - update to 5.14.21-150500.13.64.1
kernel-source-rt - update to 5.14.21-150500.13.64.1
ocfs2-kmp-rt - update to 5.14.21-150500.13.64.1
kernel-rt-debuginfo - update to 5.14.21-150500.13.64.1
gfs2-kmp-rt-debuginfo - update to 5.14.21-150500.13.64.1
kernel-rt_debug-vdso-debuginfo - update to 5.14.21-150500.13.64.1
reiserfs-kmp-rt-debuginfo - update to 5.14.21-150500.13.64.1
kernel-rt_debug-vdso - update to 5.14.21-150500.13.64.1
kernel-rt_debug-livepatch-devel - update to 5.14.21-150500.13.64.1
cluster-md-kmp-rt - update to 5.14.21-150500.13.64.1
kernel-rt_debug-debugsource - update to 5.14.21-150500.13.64.1
kernel-rt_debug-devel-debuginfo - update to 5.14.21-150500.13.64.1
kselftests-kmp-rt-debuginfo - update to 5.14.21-150500.13.64.1
kernel-rt-vdso-debuginfo - update to 5.14.21-150500.13.64.1
kernel-rt-devel - update to 5.14.21-150500.13.64.1
kernel-rt-devel-debuginfo - update to 5.14.21-150500.13.64.1
reiserfs-kmp-rt - update to 5.14.21-150500.13.64.1
cluster-md-kmp-rt-debuginfo - update to 5.14.21-150500.13.64.1
kernel-rt-optional-debuginfo - update to 5.14.21-150500.13.64.1
kernel-rt_debug-debuginfo - update to 5.14.21-150500.13.64.1
gfs2-kmp-rt - update to 5.14.21-150500.13.64.1
kernel-rt_debug-devel - update to 5.14.21-150500.13.64.1
kernel-syms-rt - update to 5.14.21-150500.13.64.1
kernel-rt-livepatch-devel - update to 5.14.21-150500.13.64.1
dlm-kmp-rt-debuginfo - update to 5.14.21-150500.13.64.1
kernel-rt-debugsource - update to 5.14.21-150500.13.64.1
kernel-rt-optional - update to 5.14.21-150500.13.64.1
dlm-kmp-rt - update to 5.14.21-150500.13.64.1
kernel-azure-extra - update to 5.14.21-150500.33.63.1
reiserfs-kmp-azure - update to 5.14.21-150500.33.63.1
kernel-azure-optional - update to 5.14.21-150500.33.63.1
kselftests-kmp-azure - update to 5.14.21-150500.33.63.1
kernel-azure-devel-debuginfo - update to 5.14.21-150500.33.63.1
dlm-kmp-azure-debuginfo - update to 5.14.21-150500.33.63.1
kselftests-kmp-azure-debuginfo - update to 5.14.21-150500.33.63.1
cluster-md-kmp-azure-debuginfo - update to 5.14.21-150500.33.63.1
kernel-azure-extra-debuginfo - update to 5.14.21-150500.33.63.1
dlm-kmp-azure - update to 5.14.21-150500.33.63.1
reiserfs-kmp-azure-debuginfo - update to 5.14.21-150500.33.63.1
kernel-azure-devel - update to 5.14.21-150500.33.63.1
ocfs2-kmp-azure - update to 5.14.21-150500.33.63.1
kernel-azure-optional-debuginfo - update to 5.14.21-150500.33.63.1
gfs2-kmp-azure - update to 5.14.21-150500.33.63.1
ocfs2-kmp-azure-debuginfo - update to 5.14.21-150500.33.63.1
cluster-md-kmp-azure - update to 5.14.21-150500.33.63.1
kernel-azure-debugsource - update to 5.14.21-150500.33.63.1
kernel-azure-debuginfo - update to 5.14.21-150500.33.63.1
kernel-devel-azure - update to 5.14.21-150500.33.63.1
kernel-source-azure - update to 5.14.21-150500.33.63.1
kernel-azure-vdso - update to 5.14.21-150500.33.63.1
kernel-azure-vdso-debuginfo - update to 5.14.21-150500.33.63.1
kernel-azure - update to 5.14.21-150500.33.63.1
kernel-azure-livepatch-devel - update to 5.14.21-150500.33.63.1
gfs2-kmp-azure-debuginfo - update to 5.14.21-150500.33.63.1
kernel-syms-azure - update to 5.14.21-150500.33.63.1
dtb-sprd - update to 5.14.21-150500.55.73.1
kernel-kvmsmall-vdso-debuginfo - 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
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-64kb - update to 5.14.21-150500.55.73.1
cluster-md-kmp-64kb-debuginfo - 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
dtb-hisilicon - 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
kselftests-kmp-default-debuginfo - update to 5.14.21-150500.55.73.1
kernel-default-extra-debuginfo - update to 5.14.21-150500.55.73.1
reiserfs-kmp-64kb - 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
reiserfs-kmp-default-debuginfo - update to 5.14.21-150500.55.73.1
kernel-syms - update to 5.14.21-150500.55.73.1
kernel-default-livepatch-devel - 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-kvmsmall-vdso - update to 5.14.21-150500.55.73.1
kernel-64kb-optional-debuginfo - 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
kernel-64kb-extra - update to 5.14.21-150500.55.73.1
dtb-allwinner - update to 5.14.21-150500.55.73.1
reiserfs-kmp-default - update to 5.14.21-150500.55.73.1
gfs2-kmp-64kb - update to 5.14.21-150500.55.73.1
kernel-debug-devel-debuginfo - update to 5.14.21-150500.55.73.1
kernel-obs-build - update to 5.14.21-150500.55.73.1
kernel-default-livepatch - update to 5.14.21-150500.55.73.1
kernel-obs-build-debugsource - update to 5.14.21-150500.55.73.1
kernel-default-debuginfo - update to 5.14.21-150500.55.73.1
kernel-default - update to 5.14.21-150500.55.73.1
kernel-kvmsmall - update to 5.14.21-150500.55.73.1
cluster-md-kmp-64kb - 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-zfcpdump - update to 5.14.21-150500.55.73.1
kernel-zfcpdump-debugsource - update to 5.14.21-150500.55.73.1
kernel-zfcpdump-debuginfo - update to 5.14.21-150500.55.73.1
dtb-aarch64 - update to 5.14.21-150500.55.73.1
dtb-xilinx - update to 5.14.21-150500.55.73.1
dtb-lg - 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-default-base - 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