NULL pointer dereference in Linux kernel - CVE-2021-47501

Vulnerability identifier: #VU90392

CSH Severity: Low

CVSS v4.0: 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-2021-47501

CWE-ID: CWE-476

Exploitation vector: Local access

Exploit availability: No public exploit available

Affected software:
Linux kernel
SUSE Linux Enterprise High Availability Extension 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise High Performance Computing LTSS 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise High Performance Computing ESPOS 15
SUSE Linux Enterprise High Performance Computing 12
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise Workstation Extension 15
SUSE Linux Enterprise Real Time 12
SUSE Linux Enterprise Software Development Kit 12
SUSE Linux Enterprise Server for SAP Applications 12
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise High Availability Extension 12
SUSE Manager Proxy
SUSE Manager Retail Branch Server
SUSE Manager Server
SUSE Linux Enterprise Micro
SUSE Linux Enterprise Micro for Rancher
openSUSE Leap Micro
SUSE Enterprise Storage
Anolis OS
SUSE Linux Enterprise Workstation Extension 12
SUSE Linux Enterprise Live Patching
Ubuntu
SUSE Linux Enterprise Server 15 SP3 LTSS
SUSE Linux Enterprise Server 15 SP3 Business Critical Linux
SUSE Linux Enterprise Server 15 SP4 LTSS
SUSE Linux Enterprise Desktop 15 SP4 LTSS
Legacy Module
Public Cloud Module
Development Tools Module
Basesystem Module
SUSE Real Time Module
openSUSE Leap
openEuler
RecoverPoint for Virtual Machines
linux-image-generic-lts-xenial (Ubuntu package)
linux-image-virtual (Ubuntu package)
linux-image-aws-hwe (Ubuntu package)
linux-image-gcp (Ubuntu package)
linux-image-generic-hwe-16.04 (Ubuntu package)
linux-image-azure (Ubuntu package)
linux-image-5.4.0-1142-azure (Ubuntu package)
linux-image-azure-lts-18.04 (Ubuntu package)
linux-image-4.15.0-1184-azure (Ubuntu package)
linux-image-virtual-lts-xenial (Ubuntu package)
linux-image-lowlatency-lts-xenial (Ubuntu package)
linux-image-lowlatency (Ubuntu package)
linux-image-oracle-lts-18.04 (Ubuntu package)
linux-image-generic (Ubuntu package)
linux-image-4.4.0-262-lowlatency (Ubuntu package)
linux-image-gke (Ubuntu package)
linux-image-lowlatency-hwe-16.04 (Ubuntu package)
linux-image-oem (Ubuntu package)
linux-image-4.4.0-262-generic (Ubuntu package)
linux-image-4.4.0-1139-aws (Ubuntu package)
linux-image-kvm (Ubuntu package)
linux-image-aws (Ubuntu package)
linux-image-4.4.0-1177-aws (Ubuntu package)
linux-image-4.4.0-1140-kvm (Ubuntu package)
linux-image-virtual-hwe-16.04 (Ubuntu package)
linux-image-oracle (Ubuntu package)
linux-image-5.4.0-1135-oracle (Ubuntu package)
linux-image-5.4.0-1083-ibm (Ubuntu package)
linux-image-5.4.0-1140-gcp (Ubuntu package)
linux-image-5.4.0-202-generic (Ubuntu package)
linux-image-5.4.0-202-lowlatency (Ubuntu package)
linux-image-oem-osp1 (Ubuntu package)
linux-image-generic-hwe-18.04 (Ubuntu package)
linux-image-ibm (Ubuntu package)
linux-image-lowlatency-hwe-18.04 (Ubuntu package)
linux-image-snapdragon-hwe-18.04 (Ubuntu package)
linux-image-virtual-hwe-18.04 (Ubuntu package)
linux-image-5.4.0-1136-aws (Ubuntu package)
linux-image-5.4.0-1120-raspi (Ubuntu package)
linux-image-raspi-hwe-18.04 (Ubuntu package)
linux-image-4.15.0-1138-oracle (Ubuntu package)
linux-image-4.15.0-1159-kvm (Ubuntu package)
linux-image-4.15.0-1169-gcp (Ubuntu package)
linux-image-4.15.0-1176-aws (Ubuntu package)
linux-image-4.15.0-232-generic (Ubuntu package)
linux-image-4.15.0-232-lowlatency (Ubuntu package)
linux-image-aws-lts-18.04 (Ubuntu package)
linux-image-gcp-lts-18.04 (Ubuntu package)
kgraft-patch-4_12_14-122_225-default
kernel-livepatch-SLE15-SP3_Update_45-debugsource
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-5_14_21-150400_24_122-default-debuginfo
kernel-livepatch-5_14_21-150400_24_122-default
kernel-livepatch-SLE15-SP4_Update_27-debugsource
kernel-livepatch-SLE15-SP5_Update_15-debugsource
kernel-livepatch-5_14_21-150500_55_68-default
kernel-livepatch-5_14_21-150500_55_68-default-debuginfo
kernel-livepatch-5_14_21-150500_13_58-rt-debuginfo
kernel-livepatch-SLE15-SP5-RT_Update_16-debugsource
kernel-livepatch-5_14_21-150500_13_58-rt
kernel-rt-devel-debuginfo
dlm-kmp-rt
kernel-rt_debug
kernel-rt
kernel-devel-rt
kernel-source-rt
ocfs2-kmp-rt
kernel-syms-rt
gfs2-kmp-rt
kernel-rt_debug-debuginfo
kernel-rt-debuginfo
cluster-md-kmp-rt-debuginfo
kernel-rt-base-debuginfo
kernel-rt-base
cluster-md-kmp-rt
kernel-rt_debug-debugsource
kernel-rt-devel
kernel-rt_debug-devel-debuginfo
kernel-rt-debugsource
ocfs2-kmp-rt-debuginfo
kernel-rt_debug-devel
dlm-kmp-rt-debuginfo
gfs2-kmp-rt-debuginfo
kernel-azure-debuginfo
kernel-source-azure
kernel-devel-azure
kernel-syms-azure
kernel-azure-base-debuginfo
kernel-azure-base
kernel-azure-devel
kernel-azure-debugsource
kernel-azure
kernel-default-base-debuginfo
cluster-md-kmp-default-debuginfo
kernel-default-debuginfo
kernel-default-devel
gfs2-kmp-default
ocfs2-kmp-default-debuginfo
dlm-kmp-default
kernel-default-debugsource
dlm-kmp-default-debuginfo
ocfs2-kmp-default
kernel-default-base
kernel-default-extra-debuginfo
kernel-default-extra
kernel-default-man
kernel-obs-build
kernel-obs-build-debugsource
kernel-default-kgraft
kernel-default-kgraft-devel
kernel-default-devel-debuginfo
kernel-devel
cluster-md-kmp-default
kernel-syms
gfs2-kmp-default-debuginfo
kernel-default
kernel-source
kernel-macros
kernel-docs
kernel
kernel-core
bpftool
kernel-cross-headers
kernel-debug
kernel-debug-core
kernel-debug-devel
kernel-debug-modules
kernel-debug-modules-extra
kernel-headers
kernel-modules
kernel-modules-extra
kernel-tools
kernel-tools-libs
kernel-doc
perf
python3-perf
kernel-abi-stablelists
python3-perf-debuginfo
kernel-tools-devel
kernel-tools-debuginfo
python2-perf-debuginfo
python2-perf
perf-debuginfo
bpftool-debuginfo
kernel-debuginfo
kernel-debugsource
kernel-obs-qa
kselftests-kmp-default
kernel-kvmsmall-devel-debuginfo
reiserfs-kmp-default-debuginfo
reiserfs-kmp-default
kselftests-kmp-default-debuginfo
kernel-default-optional-debuginfo
dlm-kmp-preempt
cluster-md-kmp-preempt
gfs2-kmp-preempt-debuginfo
ocfs2-kmp-preempt
kselftests-kmp-preempt-debuginfo
kernel-preempt-debugsource
gfs2-kmp-preempt
kselftests-kmp-preempt
cluster-md-kmp-preempt-debuginfo
kernel-preempt-debuginfo
reiserfs-kmp-preempt-debuginfo
kernel-preempt-optional
kernel-preempt-extra
kernel-docs-html
kernel-kvmsmall
kernel-kvmsmall-devel
kernel-debug-livepatch-devel
kernel-kvmsmall-debugsource
kernel-debug-debugsource
kernel-debug-debuginfo
kernel-debug-devel-debuginfo
kernel-kvmsmall-livepatch-devel
kernel-kvmsmall-debuginfo
kernel-default-livepatch-devel
kernel-default-livepatch
kernel-default-optional
dtb-renesas
dtb-qcom
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
dlm-kmp-64kb-debuginfo
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
dtb-hisilicon
kernel-preempt-optional-debuginfo
kernel-preempt-devel
kernel-preempt-livepatch-devel
reiserfs-kmp-preempt
ocfs2-kmp-preempt-debuginfo
dlm-kmp-preempt-debuginfo
kernel-preempt-extra-debuginfo
kernel-preempt
kernel-zfcpdump
kernel-zfcpdump-debugsource
kernel-zfcpdump-debuginfo
dtb-aarch64
dtb-rockchip
dtb-sprd
kernel-preempt-devel-debuginfo
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
kernel-64kb-optional-debuginfo
kernel-64kb-devel-debuginfo
dtb-amd
kernel-source-vanilla
kernel-default-base-rebuild
linux-image-generic-lpae (Ubuntu package)
linux-image-5.4.0-202-generic-lpae (Ubuntu package)
linux-image-5.4.0-1045-iot (Ubuntu package)
linux-image-xilinx-zynqmp (Ubuntu package)
linux-image-5.4.0-1055-xilinx-zynqmp (Ubuntu package)
linux-image-ibm-lts-20.04 (Ubuntu package)
linux-image-bluefield (Ubuntu package)
linux-image-5.4.0-1096-bluefield (Ubuntu package)
linux-image-raspi2 (Ubuntu package)
linux-image-raspi (Ubuntu package)
linux-image-5.4.0-1124-kvm (Ubuntu package)
linux-image-oracle-lts-20.04 (Ubuntu package)
linux-image-aws-lts-20.04 (Ubuntu package)
linux-image-gcp-lts-20.04 (Ubuntu package)
linux-image-azure-lts-20.04 (Ubuntu package)
dtb-apple
dtb-amazon
kernel-rt_debug-livepatch-devel
kernel-rt_debug-vdso-debuginfo
kernel-rt_debug-vdso
kernel-rt-livepatch
kernel-rt-extra-debuginfo
kernel-rt-livepatch-devel
reiserfs-kmp-rt
kernel-rt-vdso
reiserfs-kmp-rt-debuginfo
kernel-rt-optional
kernel-rt-optional-debuginfo
kernel-rt-extra
kselftests-kmp-rt
kernel-rt-vdso-debuginfo
kselftests-kmp-rt-debuginfo
kernel-azure-livepatch-devel
reiserfs-kmp-azure
kernel-azure-vdso
kernel-azure-vdso-debuginfo
kernel-azure-optional-debuginfo
reiserfs-kmp-azure-debuginfo
ocfs2-kmp-azure
kernel-azure-extra-debuginfo
dlm-kmp-azure
cluster-md-kmp-azure
kernel-azure-devel-debuginfo
gfs2-kmp-azure
dlm-kmp-azure-debuginfo
cluster-md-kmp-azure-debuginfo
kselftests-kmp-azure-debuginfo
kselftests-kmp-azure
ocfs2-kmp-azure-debuginfo
gfs2-kmp-azure-debuginfo
kernel-azure-optional
kernel-azure-extra
kernel-debug-vdso
kernel-default-vdso-debuginfo
kernel-kvmsmall-vdso
kernel-kvmsmall-vdso-debuginfo
kernel-debug-vdso-debuginfo
kernel-default-vdso
Dell Secure Connect Gateway

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

The vulnerability exists due to NULL pointer dereference within the i40e_dbg_dump_desc() function in drivers/net/ethernet/intel/i40e/i40e_debugfs.c. A local user can perform a denial of service (DoS) attack.

Install update from vendor's website.

• https://git.kernel.org/stable/c/e5b7fb2198abc50058f1a29c395b004f76ab1c83
• https://git.kernel.org/stable/c/16431e442db248ecd8aa9457cf0a656f1885f56e
• https://git.kernel.org/stable/c/23ec111bf3549aae37140330c31a16abfc172421
• https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.85
• https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15.8
• https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.16