Use-after-free in Linux kernel - CVE-2021-47323

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Main Vulnerability Database Vulnerabilities #VU90101

Use-after-free in Linux kernel - CVE-2021-47323

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


Vulnerability identifier: #VU90101
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-2021-47323
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 wdt_startup() function in drivers/watchdog/sc520_wdt.c. A local user can escalate privileges on the system.


Affected software

Linux kernel
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise High Availability Extension 15
SUSE Linux Enterprise High Performance Computing LTSS 15
SUSE Linux Enterprise Server 11
SUSE Linux Enterprise High Performance Computing 12
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise Server for SAP Applications 12
SUSE Linux Enterprise Software Development Kit 12
SUSE Linux Enterprise High Availability Extension 12
SUSE Linux Enterprise Real Time 12
SUSE Manager Server
SUSE Manager Proxy
SUSE Manager Retail Branch Server
SUSE Linux Enterprise Micro
SUSE Linux Enterprise Micro for Rancher
SUSE Enterprise Storage
SUSE Linux Enterprise Server 11 SP4 LTSS EXTREME CORE
SUSE Linux Enterprise Workstation Extension 12
SUSE Linux Enterprise Live Patching
SUSE Linux Enterprise High Performance Computing 15 SP2 LTSS
SUSE Linux Enterprise Server 15 SP2 Business Critical Linux
SUSE Linux Enterprise Server 15 SP2 LTSS
SUSE Linux Enterprise Server 15 SP3 Business Critical Linux
SUSE Linux Enterprise Server 15 SP3 LTSS
openSUSE Leap
openEuler
kgraft-patch-4_12_14-122_219-default
kernel-livepatch-SLE15-SP2_Update_49-debugsource
kernel-livepatch-5_3_18-150200_24_194-default
kernel-livepatch-5_3_18-150200_24_194-default-debuginfo
kernel-livepatch-5_3_18-150300_59_164-preempt
kernel-livepatch-5_3_18-150300_59_164-preempt-debuginfo
kernel-livepatch-5_3_18-150300_59_164-default-debuginfo
kernel-livepatch-5_3_18-150300_59_164-default
kernel-livepatch-SLE15-SP3_Update_45-debugsource
kernel-trace
kernel-xen
kernel-ec2-devel
kernel-default-base
kernel-trace-devel
kernel-ec2
kernel-default
kernel-default-devel
kernel-ec2-base
kernel-source
kernel-xen-base
kernel-xen-devel
kernel-syms
kernel-trace-base
cluster-md-kmp-rt-debuginfo
dlm-kmp-rt-debuginfo
cluster-md-kmp-rt
kernel-rt_debug-devel-debuginfo
kernel-syms-rt
ocfs2-kmp-rt-debuginfo
gfs2-kmp-rt
kernel-rt-debuginfo
kernel-rt-devel-debuginfo
kernel-rt-base
kernel-rt-base-debuginfo
ocfs2-kmp-rt
dlm-kmp-rt
kernel-rt_debug-devel
kernel-devel-rt
kernel-source-rt
kernel-rt
kernel-rt_debug
kernel-rt_debug-debuginfo
kernel-rt-debugsource
kernel-rt-devel
gfs2-kmp-rt-debuginfo
kernel-rt_debug-debugsource
kernel-syms-azure
kernel-azure
kernel-azure-base
kernel-azure-debuginfo
kernel-azure-devel
kernel-azure-base-debuginfo
kernel-azure-debugsource
kernel-devel-azure
kernel-source-azure
cluster-md-kmp-default-debuginfo
kernel-macros
ocfs2-kmp-default-debuginfo
kernel-default-debuginfo
gfs2-kmp-default
kernel-devel
kernel-default-devel-debuginfo
kernel-default-kgraft
kernel-default-kgraft-devel
kernel-docs
kernel-obs-build
kernel-obs-build-debugsource
kernel-default-man
kernel-default-extra-debuginfo
kernel-default-extra
dlm-kmp-default
kernel-default-base-debuginfo
ocfs2-kmp-default
gfs2-kmp-default-debuginfo
dlm-kmp-default-debuginfo
cluster-md-kmp-default
kernel-default-debugsource
kernel
python2-perf
kernel-tools-debuginfo
python2-perf-debuginfo
kernel-tools
bpftool
python3-perf-debuginfo
bpftool-debuginfo
kernel-debugsource
kernel-tools-devel
perf-debuginfo
kernel-debuginfo
perf
python3-perf
kernel-preempt-devel
kernel-preempt-devel-debuginfo
kernel-preempt-debugsource
reiserfs-kmp-default
reiserfs-kmp-default-debuginfo
kernel-preempt-debuginfo
kernel-preempt
kernel-default-livepatch-devel
kernel-default-livepatch
kernel-64kb-optional-debuginfo
dtb-sprd
dtb-hisilicon
dtb-arm
kernel-64kb-debugsource
dtb-rockchip
kernel-64kb-livepatch-devel
reiserfs-kmp-64kb
dtb-freescale
kernel-64kb-optional
ocfs2-kmp-64kb-debuginfo
dtb-apm
dtb-exynos
dtb-socionext
kernel-preempt-extra
dtb-aarch64
kernel-zfcpdump-debuginfo
kernel-zfcpdump-debugsource
kernel-zfcpdump
kernel-preempt-extra-debuginfo
dlm-kmp-preempt-debuginfo
ocfs2-kmp-preempt-debuginfo
reiserfs-kmp-preempt
kernel-preempt-livepatch-devel
kernel-preempt-optional-debuginfo
dlm-kmp-preempt
kselftests-kmp-preempt-debuginfo
dtb-cavium
kernel-64kb
dtb-allwinner
dtb-lg
dtb-al
kernel-64kb-extra-debuginfo
dtb-amlogic
dtb-nvidia
cluster-md-kmp-64kb-debuginfo
gfs2-kmp-64kb-debuginfo
kernel-64kb-extra
cluster-md-kmp-64kb
reiserfs-kmp-64kb-debuginfo
dtb-xilinx
dtb-renesas
kselftests-kmp-64kb-debuginfo
kernel-64kb-devel-debuginfo
kernel-64kb-devel
gfs2-kmp-64kb
dlm-kmp-64kb
kselftests-kmp-64kb
ocfs2-kmp-64kb
kernel-64kb-debuginfo
dtb-zte
dtb-broadcom
dtb-altera
dtb-mediatek
dtb-marvell
dtb-qcom
dlm-kmp-64kb-debuginfo
dtb-amd
kernel-debug-devel-debuginfo
kernel-kvmsmall-debuginfo
kernel-kvmsmall-livepatch-devel
kernel-kvmsmall-devel-debuginfo
reiserfs-kmp-preempt-debuginfo
kernel-debug-debuginfo
kernel-debug-debugsource
kernel-kvmsmall-debugsource
kernel-debug-livepatch-devel
kernel-debug-devel
kernel-kvmsmall-devel
kernel-debug
kernel-kvmsmall
kernel-docs-html
kernel-source-vanilla
kernel-preempt-optional
cluster-md-kmp-preempt-debuginfo
kselftests-kmp-preempt
gfs2-kmp-preempt
ocfs2-kmp-preempt
gfs2-kmp-preempt-debuginfo
cluster-md-kmp-preempt
kernel-obs-qa
kernel-default-optional
kselftests-kmp-default-debuginfo
kernel-default-optional-debuginfo
kselftests-kmp-default
kernel-default-base-rebuild
Dell Secure Connect Gateway
EMC Cloud Tiering Appliance

How to mitigate CVE-2021-47323

Install update from vendor's website.

Linux kernel - addressed in versions 4.4.276, 4.9.276, 4.14.240, 4.19.198, 5.4.134, 5.10.52, 5.12.19, 5.13.4, 5.14
kgraft-patch-4_12_14-122_219-default - update to 1-8.3.1
kernel-livepatch-SLE15-SP2_Update_49-debugsource - update to 1-150200.5.3.1
kernel-livepatch-5_3_18-150200_24_194-default - update to 1-150200.5.3.1
kernel-livepatch-5_3_18-150200_24_194-default-debuginfo - update to 1-150200.5.3.1
kernel-livepatch-5_3_18-150300_59_164-preempt - update to 1-150300.7.3.1
kernel-livepatch-5_3_18-150300_59_164-preempt-debuginfo - update to 1-150300.7.3.1
kernel-livepatch-5_3_18-150300_59_164-default-debuginfo - update to 1-150300.7.3.1
kernel-livepatch-5_3_18-150300_59_164-default - update to 1-150300.7.3.1
kernel-livepatch-SLE15-SP3_Update_45-debugsource - update to 1-150300.7.3.1
kernel-trace - update to 3.0.101-108.156.1
kernel-xen - update to 3.0.101-108.156.1
kernel-ec2-devel - update to 3.0.101-108.156.1
kernel-default-base - addressed in versions 3.0.101-108.156.1, 4.12.14-122.219.1, 5.3.18-150200.24.194.1.150200.9.99.1, 5.3.18-150300.59.164.1.150300.18.96.1
kernel-trace-devel - update to 3.0.101-108.156.1
kernel-ec2 - update to 3.0.101-108.156.1
kernel-default - addressed in versions 3.0.101-108.156.1, 4.12.14-122.219.1, 5.3.18-150200.24.194.1, 5.3.18-150300.59.164.1
kernel-default-devel - addressed in versions 3.0.101-108.156.1, 4.12.14-122.219.1, 5.3.18-150200.24.194.1, 5.3.18-150300.59.164.1
kernel-ec2-base - update to 3.0.101-108.156.1
kernel-source - addressed in versions 3.0.101-108.156.1, 4.12.14-122.219.1, 5.3.18-150200.24.194.1, 5.3.18-150300.59.164.1
kernel-xen-base - update to 3.0.101-108.156.1
kernel-xen-devel - update to 3.0.101-108.156.1
kernel-syms - addressed in versions 3.0.101-108.156.1, 4.12.14-122.219.1, 5.3.18-150200.24.194.1, 5.3.18-150300.59.164.1
kernel-trace-base - update to 3.0.101-108.156.1
cluster-md-kmp-rt-debuginfo - update to 4.12.14-10.188.1
dlm-kmp-rt-debuginfo - update to 4.12.14-10.188.1
cluster-md-kmp-rt - update to 4.12.14-10.188.1
kernel-rt_debug-devel-debuginfo - update to 4.12.14-10.188.1
kernel-syms-rt - update to 4.12.14-10.188.1
ocfs2-kmp-rt-debuginfo - update to 4.12.14-10.188.1
gfs2-kmp-rt - update to 4.12.14-10.188.1
kernel-rt-debuginfo - addressed in versions 4.12.14-10.188.1, 5.3.18-150300.172.1
kernel-rt-devel-debuginfo - update to 4.12.14-10.188.1
kernel-rt-base - update to 4.12.14-10.188.1
kernel-rt-base-debuginfo - update to 4.12.14-10.188.1
ocfs2-kmp-rt - update to 4.12.14-10.188.1
dlm-kmp-rt - update to 4.12.14-10.188.1
kernel-rt_debug-devel - update to 4.12.14-10.188.1
kernel-devel-rt - update to 4.12.14-10.188.1
kernel-source-rt - addressed in versions 4.12.14-10.188.1, 5.3.18-150300.172.1
kernel-rt - addressed in versions 4.12.14-10.188.1, 5.3.18-150300.172.1
kernel-rt_debug - update to 4.12.14-10.188.1
kernel-rt_debug-debuginfo - update to 4.12.14-10.188.1
kernel-rt-debugsource - addressed in versions 4.12.14-10.188.1, 5.3.18-150300.172.1
kernel-rt-devel - update to 4.12.14-10.188.1
gfs2-kmp-rt-debuginfo - update to 4.12.14-10.188.1
kernel-rt_debug-debugsource - update to 4.12.14-10.188.1
kernel-syms-azure - update to 4.12.14-16.188.1
kernel-azure - update to 4.12.14-16.188.1
kernel-azure-base - update to 4.12.14-16.188.1
kernel-azure-debuginfo - update to 4.12.14-16.188.1
kernel-azure-devel - update to 4.12.14-16.188.1
kernel-azure-base-debuginfo - update to 4.12.14-16.188.1
kernel-azure-debugsource - update to 4.12.14-16.188.1
kernel-devel-azure - update to 4.12.14-16.188.1
kernel-source-azure - update to 4.12.14-16.188.1
cluster-md-kmp-default-debuginfo - addressed in versions 4.12.14-122.219.1, 5.3.18-150200.24.194.1, 5.3.18-150300.59.164.1
kernel-macros - addressed in versions 4.12.14-122.219.1, 5.3.18-150200.24.194.1, 5.3.18-150300.59.164.1
ocfs2-kmp-default-debuginfo - addressed in versions 4.12.14-122.219.1, 5.3.18-150200.24.194.1, 5.3.18-150300.59.164.1
kernel-default-debuginfo - addressed in versions 4.12.14-122.219.1, 5.3.18-150200.24.194.1, 5.3.18-150300.59.164.1
gfs2-kmp-default - addressed in versions 4.12.14-122.219.1, 5.3.18-150200.24.194.1, 5.3.18-150300.59.164.1
kernel-devel - addressed in versions 4.12.14-122.219.1, 5.3.18-150200.24.194.1, 5.3.18-150300.59.164.1
kernel-default-devel-debuginfo - addressed in versions 4.12.14-122.219.1, 5.3.18-150200.24.194.1, 5.3.18-150300.59.164.1
kernel-default-kgraft - update to 4.12.14-122.219.1
kernel-default-kgraft-devel - update to 4.12.14-122.219.1
kernel-docs - addressed in versions 4.12.14-122.219.1, 5.3.18-150200.24.194.1, 5.3.18-150300.59.164.1
kernel-obs-build - addressed in versions 4.12.14-122.219.1, 5.3.18-150200.24.194.1, 5.3.18-150300.59.164.1
kernel-obs-build-debugsource - addressed in versions 4.12.14-122.219.1, 5.3.18-150200.24.194.1, 5.3.18-150300.59.164.1
kernel-default-man - update to 4.12.14-122.219.1
kernel-default-extra-debuginfo - addressed in versions 4.12.14-122.219.1, 5.3.18-150300.59.164.1
kernel-default-extra - addressed in versions 4.12.14-122.219.1, 5.3.18-150300.59.164.1
dlm-kmp-default - addressed in versions 4.12.14-122.219.1, 5.3.18-150200.24.194.1, 5.3.18-150300.59.164.1
kernel-default-base-debuginfo - update to 4.12.14-122.219.1
ocfs2-kmp-default - addressed in versions 4.12.14-122.219.1, 5.3.18-150200.24.194.1, 5.3.18-150300.59.164.1
gfs2-kmp-default-debuginfo - addressed in versions 4.12.14-122.219.1, 5.3.18-150200.24.194.1, 5.3.18-150300.59.164.1
dlm-kmp-default-debuginfo - addressed in versions 4.12.14-122.219.1, 5.3.18-150200.24.194.1, 5.3.18-150300.59.164.1
cluster-md-kmp-default - addressed in versions 4.12.14-122.219.1, 5.3.18-150200.24.194.1, 5.3.18-150300.59.164.1
kernel-default-debugsource - addressed in versions 4.12.14-122.219.1, 5.3.18-150200.24.194.1, 5.3.18-150300.59.164.1
kernel - update to 4.19.90-2406.1.0.0279
python2-perf - update to 4.19.90-2406.1.0.0279
kernel-tools-debuginfo - update to 4.19.90-2406.1.0.0279
python2-perf-debuginfo - update to 4.19.90-2406.1.0.0279
kernel-tools - update to 4.19.90-2406.1.0.0279
kernel-devel - update to 4.19.90-2406.1.0.0279
bpftool - update to 4.19.90-2406.1.0.0279
kernel-source - update to 4.19.90-2406.1.0.0279
python3-perf-debuginfo - update to 4.19.90-2406.1.0.0279
bpftool-debuginfo - update to 4.19.90-2406.1.0.0279
kernel-debugsource - update to 4.19.90-2406.1.0.0279
kernel-tools-devel - update to 4.19.90-2406.1.0.0279
perf-debuginfo - update to 4.19.90-2406.1.0.0279
kernel-debuginfo - update to 4.19.90-2406.1.0.0279
perf - update to 4.19.90-2406.1.0.0279
python3-perf - update to 4.19.90-2406.1.0.0279
kernel-preempt-devel - addressed in versions 5.3.18-150200.24.194.1, 5.3.18-150300.59.164.1
kernel-preempt-devel-debuginfo - addressed in versions 5.3.18-150200.24.194.1, 5.3.18-150300.59.164.1
kernel-preempt-debugsource - addressed in versions 5.3.18-150200.24.194.1, 5.3.18-150300.59.164.1
reiserfs-kmp-default - addressed in versions 5.3.18-150200.24.194.1, 5.3.18-150300.59.164.1
reiserfs-kmp-default-debuginfo - addressed in versions 5.3.18-150200.24.194.1, 5.3.18-150300.59.164.1
kernel-preempt-debuginfo - addressed in versions 5.3.18-150200.24.194.1, 5.3.18-150300.59.164.1
kernel-preempt - addressed in versions 5.3.18-150200.24.194.1, 5.3.18-150300.59.164.1
kernel-default-livepatch-devel - addressed in versions 5.3.18-150200.24.194.1, 5.3.18-150300.59.164.1
kernel-default-livepatch - addressed in versions 5.3.18-150200.24.194.1, 5.3.18-150300.59.164.1
kernel-64kb-optional-debuginfo - update to 5.3.18-150300.59.164.1
dtb-sprd - update to 5.3.18-150300.59.164.1
dtb-hisilicon - update to 5.3.18-150300.59.164.1
dtb-arm - update to 5.3.18-150300.59.164.1
kernel-64kb-debugsource - update to 5.3.18-150300.59.164.1
dtb-rockchip - update to 5.3.18-150300.59.164.1
kernel-64kb-livepatch-devel - update to 5.3.18-150300.59.164.1
reiserfs-kmp-64kb - update to 5.3.18-150300.59.164.1
dtb-freescale - update to 5.3.18-150300.59.164.1
kernel-64kb-optional - update to 5.3.18-150300.59.164.1
ocfs2-kmp-64kb-debuginfo - update to 5.3.18-150300.59.164.1
dtb-apm - update to 5.3.18-150300.59.164.1
dtb-exynos - update to 5.3.18-150300.59.164.1
dtb-socionext - update to 5.3.18-150300.59.164.1
kernel-preempt-extra - update to 5.3.18-150300.59.164.1
dtb-aarch64 - update to 5.3.18-150300.59.164.1
kernel-zfcpdump-debuginfo - update to 5.3.18-150300.59.164.1
kernel-zfcpdump-debugsource - update to 5.3.18-150300.59.164.1
kernel-zfcpdump - update to 5.3.18-150300.59.164.1
kernel-preempt-extra-debuginfo - update to 5.3.18-150300.59.164.1
dlm-kmp-preempt-debuginfo - update to 5.3.18-150300.59.164.1
ocfs2-kmp-preempt-debuginfo - update to 5.3.18-150300.59.164.1
reiserfs-kmp-preempt - update to 5.3.18-150300.59.164.1
kernel-preempt-livepatch-devel - update to 5.3.18-150300.59.164.1
kernel-preempt-optional-debuginfo - update to 5.3.18-150300.59.164.1
dlm-kmp-preempt - update to 5.3.18-150300.59.164.1
kselftests-kmp-preempt-debuginfo - update to 5.3.18-150300.59.164.1
dtb-cavium - update to 5.3.18-150300.59.164.1
kernel-64kb - update to 5.3.18-150300.59.164.1
dtb-allwinner - update to 5.3.18-150300.59.164.1
dtb-lg - update to 5.3.18-150300.59.164.1
dtb-al - update to 5.3.18-150300.59.164.1
kernel-64kb-extra-debuginfo - update to 5.3.18-150300.59.164.1
dtb-amlogic - update to 5.3.18-150300.59.164.1
dtb-nvidia - update to 5.3.18-150300.59.164.1
cluster-md-kmp-64kb-debuginfo - update to 5.3.18-150300.59.164.1
gfs2-kmp-64kb-debuginfo - update to 5.3.18-150300.59.164.1
kernel-64kb-extra - update to 5.3.18-150300.59.164.1
cluster-md-kmp-64kb - update to 5.3.18-150300.59.164.1
reiserfs-kmp-64kb-debuginfo - update to 5.3.18-150300.59.164.1
dtb-xilinx - update to 5.3.18-150300.59.164.1
dtb-renesas - update to 5.3.18-150300.59.164.1
kselftests-kmp-64kb-debuginfo - update to 5.3.18-150300.59.164.1
kernel-64kb-devel-debuginfo - update to 5.3.18-150300.59.164.1
kernel-64kb-devel - update to 5.3.18-150300.59.164.1
gfs2-kmp-64kb - update to 5.3.18-150300.59.164.1
dlm-kmp-64kb - update to 5.3.18-150300.59.164.1
kselftests-kmp-64kb - update to 5.3.18-150300.59.164.1
ocfs2-kmp-64kb - update to 5.3.18-150300.59.164.1
kernel-64kb-debuginfo - update to 5.3.18-150300.59.164.1
dtb-zte - update to 5.3.18-150300.59.164.1
dtb-broadcom - update to 5.3.18-150300.59.164.1
dtb-altera - update to 5.3.18-150300.59.164.1
dtb-mediatek - update to 5.3.18-150300.59.164.1
dtb-marvell - update to 5.3.18-150300.59.164.1
dtb-qcom - update to 5.3.18-150300.59.164.1
dlm-kmp-64kb-debuginfo - update to 5.3.18-150300.59.164.1
dtb-amd - update to 5.3.18-150300.59.164.1
kernel-debug-devel-debuginfo - update to 5.3.18-150300.59.164.1
kernel-kvmsmall-debuginfo - update to 5.3.18-150300.59.164.1
kernel-kvmsmall-livepatch-devel - update to 5.3.18-150300.59.164.1
kernel-kvmsmall-devel-debuginfo - update to 5.3.18-150300.59.164.1
reiserfs-kmp-preempt-debuginfo - update to 5.3.18-150300.59.164.1
kernel-debug-debuginfo - update to 5.3.18-150300.59.164.1
kernel-debug-debugsource - update to 5.3.18-150300.59.164.1
kernel-kvmsmall-debugsource - update to 5.3.18-150300.59.164.1
kernel-debug-livepatch-devel - update to 5.3.18-150300.59.164.1
kernel-debug-devel - update to 5.3.18-150300.59.164.1
kernel-kvmsmall-devel - update to 5.3.18-150300.59.164.1
kernel-debug - update to 5.3.18-150300.59.164.1
kernel-kvmsmall - update to 5.3.18-150300.59.164.1
kernel-docs-html - update to 5.3.18-150300.59.164.1
kernel-source-vanilla - update to 5.3.18-150300.59.164.1
kernel-preempt-optional - update to 5.3.18-150300.59.164.1
cluster-md-kmp-preempt-debuginfo - update to 5.3.18-150300.59.164.1
kselftests-kmp-preempt - update to 5.3.18-150300.59.164.1
gfs2-kmp-preempt - update to 5.3.18-150300.59.164.1
ocfs2-kmp-preempt - update to 5.3.18-150300.59.164.1
gfs2-kmp-preempt-debuginfo - update to 5.3.18-150300.59.164.1
cluster-md-kmp-preempt - update to 5.3.18-150300.59.164.1
kernel-obs-qa - update to 5.3.18-150300.59.164.1
kernel-default-optional - update to 5.3.18-150300.59.164.1
kselftests-kmp-default-debuginfo - update to 5.3.18-150300.59.164.1
kernel-default-optional-debuginfo - update to 5.3.18-150300.59.164.1
kselftests-kmp-default - update to 5.3.18-150300.59.164.1
kernel-default-base-rebuild - update to 5.3.18-150300.59.164.1.150300.18.96.1
Dell Secure Connect Gateway - update to 5.26.00.18
EMC Cloud Tiering Appliance - update to 13.2.0.2.31

External References

Related Security Bulletins