NULL pointer dereference in Linux kernel - CVE-2021-47270

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Main Vulnerability Database Vulnerabilities #VU90484

NULL pointer dereference in Linux kernel - CVE-2021-47270

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


Vulnerability identifier: #VU90484
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-2021-47270
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 tcm_bind() function in drivers/usb/gadget/function/f_tcm.c, within the geth_bind() function in drivers/usb/gadget/function/f_subset.c, within the usb_assign_descriptors() function in drivers/usb/gadget/function/f_sourcesink.c, within the gser_bind() function in drivers/usb/gadget/function/f_serial.c, within the rndis_bind() function in drivers/usb/gadget/function/f_rndis.c, within the usb_assign_descriptors() function in drivers/usb/gadget/function/f_printer.c, within the usb_assign_descriptors() function in drivers/usb/gadget/function/f_loopback.c, within the eem_bind() function in drivers/usb/gadget/function/f_eem.c, within the ecm_bind() function in drivers/usb/gadget/function/f_ecm.c. A local user can perform a denial of service (DoS) attack.


Affected software

Linux kernel
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise High Availability Extension 15
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise Server 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 Software Development Kit 12
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise Real Time 12
SUSE Linux Enterprise High Availability Extension 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 Live Patching
SUSE Linux Enterprise Workstation Extension 12
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 LTSS
SUSE Linux Enterprise Server 15 SP3 Business Critical Linux
openSUSE Leap
openEuler
kgraft-patch-4_12_14-122_222-default
kernel-livepatch-5_3_18-150200_24_194-default-debuginfo
kernel-livepatch-5_3_18-150200_24_194-default
kernel-livepatch-SLE15-SP2_Update_49-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-livepatch-SLE15-SP3_Update_45-debugsource
gfs2-kmp-rt-debuginfo
kernel-rt
kernel-rt_debug
kernel-devel-rt
kernel-rt-devel-debuginfo
dlm-kmp-rt-debuginfo
gfs2-kmp-rt
kernel-rt_debug-debugsource
kernel-rt_debug-debuginfo
kernel-rt-base
kernel-rt-debugsource
dlm-kmp-rt
kernel-source-rt
kernel-rt-devel
cluster-md-kmp-rt
ocfs2-kmp-rt-debuginfo
ocfs2-kmp-rt
kernel-rt_debug-devel-debuginfo
kernel-rt_debug-devel
cluster-md-kmp-rt-debuginfo
kernel-syms-rt
kernel-rt-debuginfo
kernel-rt-base-debuginfo
kernel-azure-base
kernel-source-azure
kernel-devel-azure
kernel-azure-debugsource
kernel-syms-azure
kernel-azure-base-debuginfo
kernel-azure-devel
kernel-azure-debuginfo
kernel-azure
dlm-kmp-default-debuginfo
kernel-docs
ocfs2-kmp-default
kernel-default-base
kernel-devel
kernel-source
kernel-macros
kernel-default-devel-debuginfo
kernel-default-kgraft-devel
kernel-default-kgraft
kernel-default
gfs2-kmp-default
kernel-default-devel
kernel-syms
ocfs2-kmp-default-debuginfo
kernel-default-debuginfo
cluster-md-kmp-default
kernel-default-base-debuginfo
cluster-md-kmp-default-debuginfo
dlm-kmp-default
kernel-default-debugsource
gfs2-kmp-default-debuginfo
kernel-obs-build
kernel-default-man
kernel-default-extra
kernel-default-extra-debuginfo
kernel-obs-build-debugsource
perf-debuginfo
python2-perf
python2-perf-debuginfo
python3-perf
perf
kernel-tools-devel
kernel-tools-debuginfo
kernel-tools
kernel-debugsource
kernel-debuginfo
python3-perf-debuginfo
bpftool-debuginfo
bpftool
kernel
kernel-default-livepatch-devel
kernel-default-livepatch
kernel-preempt-debugsource
reiserfs-kmp-default
reiserfs-kmp-default-debuginfo
kernel-preempt-devel-debuginfo
kernel-preempt-devel
kernel-preempt-debuginfo
kernel-preempt
dtb-marvell
dtb-mediatek
dtb-altera
dtb-broadcom
dtb-zte
kernel-64kb-debuginfo
ocfs2-kmp-64kb
kselftests-kmp-64kb
dlm-kmp-64kb
gfs2-kmp-64kb
kernel-64kb-devel
dtb-cavium
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
kernel-preempt-extra-debuginfo
dtb-al
dtb-lg
dtb-allwinner
kernel-64kb
kernel-default-optional
kselftests-kmp-default
kernel-default-optional-debuginfo
kselftests-kmp-default-debuginfo
dtb-qcom
kernel-kvmsmall-debugsource
kernel-source-vanilla
kernel-docs-html
kernel-kvmsmall
kernel-debug
kernel-kvmsmall-devel
kernel-debug-devel
kernel-debug-livepatch-devel
kernel-obs-qa
kernel-debug-debugsource
kernel-debug-debuginfo
kernel-debug-devel-debuginfo
kernel-kvmsmall-devel-debuginfo
kernel-kvmsmall-livepatch-devel
kernel-kvmsmall-debuginfo
reiserfs-kmp-64kb
kernel-zfcpdump
kernel-zfcpdump-debugsource
kernel-zfcpdump-debuginfo
dtb-aarch64
dtb-rockchip
dtb-sprd
dtb-hisilicon
dtb-arm
kernel-64kb-debugsource
kernel-64kb-livepatch-devel
dtb-freescale
kernel-64kb-optional
ocfs2-kmp-64kb-debuginfo
dtb-apm
dtb-exynos
dtb-socionext
kernel-64kb-optional-debuginfo
kernel-64kb-devel-debuginfo
dtb-amd
dlm-kmp-64kb-debuginfo
reiserfs-kmp-preempt-debuginfo
cluster-md-kmp-preempt
gfs2-kmp-preempt-debuginfo
ocfs2-kmp-preempt
kselftests-kmp-preempt-debuginfo
gfs2-kmp-preempt
kselftests-kmp-preempt
cluster-md-kmp-preempt-debuginfo
kernel-preempt-optional
kernel-preempt-extra
dlm-kmp-preempt
kernel-preempt-optional-debuginfo
kernel-preempt-livepatch-devel
reiserfs-kmp-preempt
ocfs2-kmp-preempt-debuginfo
dlm-kmp-preempt-debuginfo
kernel-default-base-rebuild
EMC Cloud Tiering Appliance

How to mitigate CVE-2021-47270

Install update from vendor's website.

Linux kernel - addressed in versions 4.9.273, 4.14.237, 4.19.195, 5.4.126, 5.10.44, 5.12.11, 5.13
kgraft-patch-4_12_14-122_222-default - update to 1-8.3.1
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-SP2_Update_49-debugsource - update to 1-150200.5.3.1
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-livepatch-SLE15-SP3_Update_45-debugsource - update to 1-150300.7.3.1
gfs2-kmp-rt-debuginfo - update to 4.12.14-10.191.1
kernel-rt - addressed in versions 4.12.14-10.191.1, 5.3.18-150300.172.1
kernel-rt_debug - update to 4.12.14-10.191.1
kernel-devel-rt - update to 4.12.14-10.191.1
kernel-rt-devel-debuginfo - update to 4.12.14-10.191.1
dlm-kmp-rt-debuginfo - update to 4.12.14-10.191.1
gfs2-kmp-rt - update to 4.12.14-10.191.1
kernel-rt_debug-debugsource - update to 4.12.14-10.191.1
kernel-rt_debug-debuginfo - update to 4.12.14-10.191.1
kernel-rt-base - update to 4.12.14-10.191.1
kernel-rt-debugsource - addressed in versions 4.12.14-10.191.1, 5.3.18-150300.172.1
dlm-kmp-rt - update to 4.12.14-10.191.1
kernel-source-rt - addressed in versions 4.12.14-10.191.1, 5.3.18-150300.172.1
kernel-rt-devel - update to 4.12.14-10.191.1
cluster-md-kmp-rt - update to 4.12.14-10.191.1
ocfs2-kmp-rt-debuginfo - update to 4.12.14-10.191.1
ocfs2-kmp-rt - update to 4.12.14-10.191.1
kernel-rt_debug-devel-debuginfo - update to 4.12.14-10.191.1
kernel-rt_debug-devel - update to 4.12.14-10.191.1
cluster-md-kmp-rt-debuginfo - update to 4.12.14-10.191.1
kernel-syms-rt - update to 4.12.14-10.191.1
kernel-rt-debuginfo - addressed in versions 4.12.14-10.191.1, 5.3.18-150300.172.1
kernel-rt-base-debuginfo - update to 4.12.14-10.191.1
kernel-azure-base - update to 4.12.14-16.191.1
kernel-source-azure - update to 4.12.14-16.191.1
kernel-devel-azure - update to 4.12.14-16.191.1
kernel-azure-debugsource - update to 4.12.14-16.191.1
kernel-syms-azure - update to 4.12.14-16.191.1
kernel-azure-base-debuginfo - update to 4.12.14-16.191.1
kernel-azure-devel - update to 4.12.14-16.191.1
kernel-azure-debuginfo - update to 4.12.14-16.191.1
kernel-azure - update to 4.12.14-16.191.1
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
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
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-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-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-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-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 - 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
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
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-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
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-base-debuginfo - update to 4.12.14-122.222.1
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
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
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
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-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-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
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
perf - update to 4.19.90-2407.3.0.0285
kernel-tools-devel - update to 4.19.90-2407.3.0.0285
kernel-tools-debuginfo - update to 4.19.90-2407.3.0.0285
kernel-tools - update to 4.19.90-2407.3.0.0285
kernel-devel - update to 4.19.90-2407.3.0.0285
kernel-debugsource - update to 4.19.90-2407.3.0.0285
kernel-debuginfo - update to 4.19.90-2407.3.0.0285
kernel-source - update to 4.19.90-2407.3.0.0285
python3-perf-debuginfo - update to 4.19.90-2407.3.0.0285
bpftool-debuginfo - 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
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-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-devel-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
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
dtb-marvell - update to 5.3.18-150300.59.164.1
dtb-mediatek - update to 5.3.18-150300.59.164.1
dtb-altera - update to 5.3.18-150300.59.164.1
dtb-broadcom - update to 5.3.18-150300.59.164.1
dtb-zte - update to 5.3.18-150300.59.164.1
kernel-64kb-debuginfo - update to 5.3.18-150300.59.164.1
ocfs2-kmp-64kb - update to 5.3.18-150300.59.164.1
kselftests-kmp-64kb - update to 5.3.18-150300.59.164.1
dlm-kmp-64kb - update to 5.3.18-150300.59.164.1
gfs2-kmp-64kb - update to 5.3.18-150300.59.164.1
kernel-64kb-devel - update to 5.3.18-150300.59.164.1
dtb-cavium - 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
kernel-preempt-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
dtb-qcom - update to 5.3.18-150300.59.164.1
kernel-kvmsmall-debugsource - 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-debug-livepatch-devel - update to 5.3.18-150300.59.164.1
kernel-obs-qa - 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
reiserfs-kmp-64kb - 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
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
kernel-64kb-livepatch-devel - 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-64kb-optional-debuginfo - update to 5.3.18-150300.59.164.1
kernel-64kb-devel-debuginfo - update to 5.3.18-150300.59.164.1
dtb-amd - update to 5.3.18-150300.59.164.1
dlm-kmp-64kb-debuginfo - update to 5.3.18-150300.59.164.1
reiserfs-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
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
cluster-md-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
reiserfs-kmp-preempt - 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-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

External References

Related Security Bulletins