NULL pointer dereference in Linux kernel - CVE-2021-47275

Vulnerability identifier: #VU93052

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-2021-47275

CWE-ID: CWE-476

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to NULL pointer dereference within the cached_dev_cache_miss() function in drivers/md/bcache/request.c. A local user can perform a denial of service (DoS) attack.

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 Linux Enterprise Server for SAP Applications 12
SUSE Linux Enterprise High Performance Computing 12
SUSE Linux Enterprise Real Time 12
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise High Availability Extension 12
SUSE Linux Enterprise Software Development Kit 12
SUSE Manager Server
SUSE Manager Retail Branch Server
SUSE Manager Proxy
SUSE Linux Enterprise Micro
SUSE Linux Enterprise Micro for Rancher
SUSE Enterprise Storage
SUSE Linux Enterprise Workstation Extension 12
SUSE Linux Enterprise Live Patching
SUSE Linux Enterprise Server 15 SP2 LTSS
SUSE Linux Enterprise Server 15 SP2 Business Critical Linux
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
openEuler
kgraft-patch-4_12_14-122_222-default
kernel-livepatch-SLE15-SP2_Update_49-debugsource
kernel-livepatch-5_3_18-150200_24_194-default-debuginfo
kernel-livepatch-5_3_18-150200_24_194-default
kernel-livepatch-SLE15-SP3_Update_45-debugsource
kernel-livepatch-5_3_18-150300_59_164-default
kernel-livepatch-5_3_18-150300_59_164-default-debuginfo
kernel-livepatch-5_3_18-150300_59_164-preempt-debuginfo
kernel-livepatch-5_3_18-150300_59_164-preempt
kernel-syms-rt
kernel-rt-debugsource
cluster-md-kmp-rt-debuginfo
kernel-rt_debug
kernel-rt-devel
dlm-kmp-rt-debuginfo
dlm-kmp-rt
kernel-rt_debug-debuginfo
kernel-rt_debug-devel
cluster-md-kmp-rt
kernel-rt-debuginfo
kernel-devel-rt
kernel-source-rt
kernel-rt-devel-debuginfo
gfs2-kmp-rt-debuginfo
kernel-rt-base-debuginfo
kernel-rt-base
ocfs2-kmp-rt-debuginfo
ocfs2-kmp-rt
kernel-rt_debug-devel-debuginfo
kernel-rt_debug-debugsource
gfs2-kmp-rt
kernel-rt
kernel-azure
kernel-azure-base-debuginfo
kernel-azure-debugsource
kernel-azure-devel
kernel-azure-base
kernel-syms-azure
kernel-azure-debuginfo
kernel-devel-azure
kernel-source-azure
kernel-default-devel-debuginfo
kernel-default-kgraft-devel
kernel-default-kgraft
kernel-docs
kernel-obs-build-debugsource
kernel-obs-build
kernel-default-man
kernel-default-extra
kernel-default-extra-debuginfo
kernel-macros
kernel-source
kernel-default
gfs2-kmp-default-debuginfo
kernel-default-debugsource
dlm-kmp-default
cluster-md-kmp-default-debuginfo
kernel-default-base-debuginfo
cluster-md-kmp-default
kernel-default-debuginfo
ocfs2-kmp-default-debuginfo
kernel-syms
kernel-default-devel
gfs2-kmp-default
dlm-kmp-default-debuginfo
ocfs2-kmp-default
kernel-default-base
kernel-devel
kernel
python2-perf
kernel-tools-debuginfo
python3-perf-debuginfo
kernel-debuginfo
perf
perf-debuginfo
kernel-tools-devel
bpftool-debuginfo
kernel-debugsource
python3-perf
bpftool
kernel-tools
python2-perf-debuginfo
reiserfs-kmp-default-debuginfo
kernel-default-livepatch
kernel-default-livepatch-devel
reiserfs-kmp-default
kernel-preempt-debugsource
kernel-preempt-devel-debuginfo
kernel-preempt
kernel-preempt-debuginfo
kernel-preempt-devel
dtb-cavium
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
kselftests-kmp-64kb-debuginfo
dtb-renesas
dtb-xilinx
reiserfs-kmp-64kb-debuginfo
cluster-md-kmp-64kb
kernel-64kb-extra
gfs2-kmp-64kb-debuginfo
cluster-md-kmp-64kb-debuginfo
dtb-nvidia
dtb-amlogic
kernel-64kb-extra-debuginfo
dtb-al
dtb-lg
dtb-allwinner
kernel-64kb
kernel-default-optional
kselftests-kmp-default
kernel-default-optional-debuginfo
kselftests-kmp-default-debuginfo
kernel-debug-livepatch-devel
kernel-source-vanilla
kernel-docs-html
kernel-kvmsmall
kernel-debug
kernel-kvmsmall-devel
kernel-debug-devel
kernel-64kb-optional-debuginfo
kernel-kvmsmall-debugsource
kernel-debug-debugsource
kernel-debug-debuginfo
kernel-debug-devel-debuginfo
kernel-kvmsmall-devel-debuginfo
kernel-kvmsmall-livepatch-devel
kernel-kvmsmall-debuginfo
dtb-hisilicon
ocfs2-kmp-preempt-debuginfo
dlm-kmp-preempt-debuginfo
kernel-preempt-extra-debuginfo
kernel-zfcpdump
kernel-zfcpdump-debugsource
kernel-zfcpdump-debuginfo
dtb-aarch64
dtb-rockchip
dtb-sprd
reiserfs-kmp-preempt
dtb-arm
kernel-64kb-debugsource
kernel-64kb-livepatch-devel
reiserfs-kmp-64kb
dtb-freescale
kernel-64kb-optional
ocfs2-kmp-64kb-debuginfo
dtb-apm
dtb-exynos
dtb-socionext
cluster-md-kmp-preempt-debuginfo
kernel-obs-qa
cluster-md-kmp-preempt
gfs2-kmp-preempt-debuginfo
ocfs2-kmp-preempt
kselftests-kmp-preempt-debuginfo
gfs2-kmp-preempt
kselftests-kmp-preempt
kernel-64kb-devel-debuginfo
reiserfs-kmp-preempt-debuginfo
kernel-preempt-optional
kernel-preempt-extra
dlm-kmp-preempt
kernel-preempt-optional-debuginfo
kernel-preempt-livepatch-devel
kernel-default-base-rebuild
EMC Cloud Tiering Appliance

Install update from vendor's website.

Linux kernel - addressed in versions 5.12.11, 5.13
kgraft-patch-4_12_14-122_222-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-debuginfo - 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-SLE15-SP3_Update_45-debugsource - 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-5_3_18-150300_59_164-default-debuginfo - 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-preempt - update to 1-150300.7.3.1
kernel-syms-rt - update to 4.12.14-10.194.1
kernel-rt-debugsource - addressed in versions 4.12.14-10.194.1, 5.3.18-150300.172.1
cluster-md-kmp-rt-debuginfo - update to 4.12.14-10.194.1
kernel-rt_debug - update to 4.12.14-10.194.1
kernel-rt-devel - update to 4.12.14-10.194.1
dlm-kmp-rt-debuginfo - update to 4.12.14-10.194.1
dlm-kmp-rt - update to 4.12.14-10.194.1
kernel-rt_debug-debuginfo - update to 4.12.14-10.194.1
kernel-rt_debug-devel - update to 4.12.14-10.194.1
cluster-md-kmp-rt - update to 4.12.14-10.194.1
kernel-rt-debuginfo - addressed in versions 4.12.14-10.194.1, 5.3.18-150300.172.1
kernel-devel-rt - update to 4.12.14-10.194.1
kernel-source-rt - addressed in versions 4.12.14-10.194.1, 5.3.18-150300.172.1
kernel-rt-devel-debuginfo - update to 4.12.14-10.194.1
gfs2-kmp-rt-debuginfo - update to 4.12.14-10.194.1
kernel-rt-base-debuginfo - update to 4.12.14-10.194.1
kernel-rt-base - update to 4.12.14-10.194.1
ocfs2-kmp-rt-debuginfo - update to 4.12.14-10.194.1
ocfs2-kmp-rt - update to 4.12.14-10.194.1
kernel-rt_debug-devel-debuginfo - update to 4.12.14-10.194.1
kernel-rt_debug-debugsource - update to 4.12.14-10.194.1
gfs2-kmp-rt - update to 4.12.14-10.194.1
kernel-rt - addressed in versions 4.12.14-10.194.1, 5.3.18-150300.172.1
kernel-azure - update to 4.12.14-16.194.1
kernel-azure-base-debuginfo - update to 4.12.14-16.194.1
kernel-azure-debugsource - update to 4.12.14-16.194.1
kernel-azure-devel - update to 4.12.14-16.194.1
kernel-azure-base - update to 4.12.14-16.194.1
kernel-syms-azure - update to 4.12.14-16.194.1
kernel-azure-debuginfo - update to 4.12.14-16.194.1
kernel-devel-azure - update to 4.12.14-16.194.1
kernel-source-azure - update to 4.12.14-16.194.1
kernel-default-devel-debuginfo - addressed in versions 4.12.14-122.222.1, 5.3.18-150200.24.194.1, 5.3.18-150300.59.164.1
kernel-default-kgraft-devel - update to 4.12.14-122.222.1
kernel-default-kgraft - update to 4.12.14-122.222.1
kernel-docs - addressed in versions 4.12.14-122.222.1, 5.3.18-150200.24.194.1, 5.3.18-150300.59.164.1
kernel-obs-build-debugsource - addressed in versions 4.12.14-122.222.1, 5.3.18-150200.24.194.1, 5.3.18-150300.59.164.1
kernel-obs-build - addressed in versions 4.12.14-122.222.1, 5.3.18-150200.24.194.1, 5.3.18-150300.59.164.1
kernel-default-man - update to 4.12.14-122.222.1
kernel-default-extra - addressed in versions 4.12.14-122.222.1, 5.3.18-150300.59.164.1
kernel-default-extra-debuginfo - addressed in versions 4.12.14-122.222.1, 5.3.18-150300.59.164.1
kernel-macros - addressed in versions 4.12.14-122.222.1, 5.3.18-150200.24.194.1, 5.3.18-150300.59.164.1
kernel-source - addressed in versions 4.12.14-122.222.1, 5.3.18-150200.24.194.1, 5.3.18-150300.59.164.1
kernel-default - addressed in versions 4.12.14-122.222.1, 5.3.18-150200.24.194.1, 5.3.18-150300.59.164.1
gfs2-kmp-default-debuginfo - addressed in versions 4.12.14-122.222.1, 5.3.18-150200.24.194.1, 5.3.18-150300.59.164.1
kernel-default-debugsource - addressed in versions 4.12.14-122.222.1, 5.3.18-150200.24.194.1, 5.3.18-150300.59.164.1
dlm-kmp-default - addressed in versions 4.12.14-122.222.1, 5.3.18-150200.24.194.1, 5.3.18-150300.59.164.1
cluster-md-kmp-default-debuginfo - addressed in versions 4.12.14-122.222.1, 5.3.18-150200.24.194.1, 5.3.18-150300.59.164.1
kernel-default-base-debuginfo - update to 4.12.14-122.222.1
cluster-md-kmp-default - addressed in versions 4.12.14-122.222.1, 5.3.18-150200.24.194.1, 5.3.18-150300.59.164.1
kernel-default-debuginfo - addressed in versions 4.12.14-122.222.1, 5.3.18-150200.24.194.1, 5.3.18-150300.59.164.1
ocfs2-kmp-default-debuginfo - addressed in versions 4.12.14-122.222.1, 5.3.18-150200.24.194.1, 5.3.18-150300.59.164.1
kernel-syms - addressed in versions 4.12.14-122.222.1, 5.3.18-150200.24.194.1, 5.3.18-150300.59.164.1
kernel-default-devel - addressed in versions 4.12.14-122.222.1, 5.3.18-150200.24.194.1, 5.3.18-150300.59.164.1
gfs2-kmp-default - addressed in versions 4.12.14-122.222.1, 5.3.18-150200.24.194.1, 5.3.18-150300.59.164.1
dlm-kmp-default-debuginfo - addressed in versions 4.12.14-122.222.1, 5.3.18-150200.24.194.1, 5.3.18-150300.59.164.1
ocfs2-kmp-default - addressed in versions 4.12.14-122.222.1, 5.3.18-150200.24.194.1, 5.3.18-150300.59.164.1
kernel-default-base - addressed in versions 4.12.14-122.222.1, 5.3.18-150200.24.194.1.150200.9.99.1, 5.3.18-150300.59.164.1.150300.18.96.1
kernel-devel - addressed in versions 4.12.14-122.222.1, 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
python3-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
perf-debuginfo - update to 4.19.90-2406.1.0.0279
kernel-tools-devel - 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
python3-perf - update to 4.19.90-2406.1.0.0279
kernel-source - update to 4.19.90-2406.1.0.0279
bpftool - update to 4.19.90-2406.1.0.0279
kernel-devel - update to 4.19.90-2406.1.0.0279
kernel-tools - update to 4.19.90-2406.1.0.0279
python2-perf-debuginfo - update to 4.19.90-2406.1.0.0279
reiserfs-kmp-default-debuginfo - 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-default-livepatch-devel - 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
kernel-preempt-debugsource - 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 - 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-devel - addressed in versions 5.3.18-150200.24.194.1, 5.3.18-150300.59.164.1
dtb-cavium - 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
kselftests-kmp-64kb-debuginfo - update to 5.3.18-150300.59.164.1
dtb-renesas - update to 5.3.18-150300.59.164.1
dtb-xilinx - update to 5.3.18-150300.59.164.1
reiserfs-kmp-64kb-debuginfo - update to 5.3.18-150300.59.164.1
cluster-md-kmp-64kb - update to 5.3.18-150300.59.164.1
kernel-64kb-extra - update to 5.3.18-150300.59.164.1
gfs2-kmp-64kb-debuginfo - update to 5.3.18-150300.59.164.1
cluster-md-kmp-64kb-debuginfo - update to 5.3.18-150300.59.164.1
dtb-nvidia - update to 5.3.18-150300.59.164.1
dtb-amlogic - update to 5.3.18-150300.59.164.1
kernel-64kb-extra-debuginfo - update to 5.3.18-150300.59.164.1
dtb-al - update to 5.3.18-150300.59.164.1
dtb-lg - update to 5.3.18-150300.59.164.1
dtb-allwinner - update to 5.3.18-150300.59.164.1
kernel-64kb - update to 5.3.18-150300.59.164.1
kernel-default-optional - update to 5.3.18-150300.59.164.1
kselftests-kmp-default - 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-debuginfo - update to 5.3.18-150300.59.164.1
kernel-debug-livepatch-devel - update to 5.3.18-150300.59.164.1
kernel-source-vanilla - update to 5.3.18-150300.59.164.1
kernel-docs-html - update to 5.3.18-150300.59.164.1
kernel-kvmsmall - update to 5.3.18-150300.59.164.1
kernel-debug - update to 5.3.18-150300.59.164.1
kernel-kvmsmall-devel - update to 5.3.18-150300.59.164.1
kernel-debug-devel - update to 5.3.18-150300.59.164.1
kernel-64kb-optional-debuginfo - update to 5.3.18-150300.59.164.1
kernel-kvmsmall-debugsource - update to 5.3.18-150300.59.164.1
kernel-debug-debugsource - update to 5.3.18-150300.59.164.1
kernel-debug-debuginfo - update to 5.3.18-150300.59.164.1
kernel-debug-devel-debuginfo - update to 5.3.18-150300.59.164.1
kernel-kvmsmall-devel-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-debuginfo - update to 5.3.18-150300.59.164.1
dtb-hisilicon - update to 5.3.18-150300.59.164.1
ocfs2-kmp-preempt-debuginfo - update to 5.3.18-150300.59.164.1
dlm-kmp-preempt-debuginfo - update to 5.3.18-150300.59.164.1
kernel-preempt-extra-debuginfo - update to 5.3.18-150300.59.164.1
kernel-zfcpdump - update to 5.3.18-150300.59.164.1
kernel-zfcpdump-debugsource - update to 5.3.18-150300.59.164.1
kernel-zfcpdump-debuginfo - update to 5.3.18-150300.59.164.1
dtb-aarch64 - update to 5.3.18-150300.59.164.1
dtb-rockchip - update to 5.3.18-150300.59.164.1
dtb-sprd - update to 5.3.18-150300.59.164.1
reiserfs-kmp-preempt - 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
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
cluster-md-kmp-preempt-debuginfo - update to 5.3.18-150300.59.164.1
kernel-obs-qa - update to 5.3.18-150300.59.164.1
cluster-md-kmp-preempt - update to 5.3.18-150300.59.164.1
gfs2-kmp-preempt-debuginfo - update to 5.3.18-150300.59.164.1
ocfs2-kmp-preempt - update to 5.3.18-150300.59.164.1
kselftests-kmp-preempt-debuginfo - update to 5.3.18-150300.59.164.1
gfs2-kmp-preempt - update to 5.3.18-150300.59.164.1
kselftests-kmp-preempt - update to 5.3.18-150300.59.164.1
kernel-64kb-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-preempt-optional - update to 5.3.18-150300.59.164.1
kernel-preempt-extra - update to 5.3.18-150300.59.164.1
dlm-kmp-preempt - update to 5.3.18-150300.59.164.1
kernel-preempt-optional-debuginfo - update to 5.3.18-150300.59.164.1
kernel-preempt-livepatch-devel - 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
EMC Cloud Tiering Appliance - update to 13.2.0.2.31

• https://git.kernel.org/stable/c/555002a840ab88468e252b0eedf0b05e2ce7099c
• https://git.kernel.org/stable/c/41fe8d088e96472f63164e213de44ec77be69478
• https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.12.11
• https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.13

• NULL pointer dereference in Linux kernel md bcache driver
• openEuler 20.03 LTS SP4 update for kernel
• SUSE update for the Linux Kernel
• SUSE update for the Linux Kernel
• SUSE update for the Linux Kernel
• SUSE update for the Linux Kernel
• SUSE update for the Linux Kernel
• SUSE update for the Linux Kernel
• Multiple vulnerabilities in Dell Cloud Tiering Appliance