Out-of-bounds read in Linux kernel - CVE-2021-47191

Vulnerability identifier: #VU90325

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-2021-47191

CWE-ID: CWE-125

Exploitation vector: Local access

Exploit availability: No public exploit available

Affected software:
Linux kernel
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise High Availability Extension 15
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise High Performance Computing ESPOS 15
SUSE Linux Enterprise High Performance Computing LTSS 15
SUSE Linux Enterprise High Performance Computing 12
SUSE Linux Enterprise Server for SAP Applications 12
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise High Availability Extension 12
SUSE Linux Enterprise Real Time 12
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise Software Development Kit 12
SUSE Linux Enterprise Workstation Extension 15
SUSE Manager Server
SUSE Manager Retail Branch Server
SUSE Manager Proxy
SUSE Linux Enterprise Micro for Rancher
SUSE Linux Enterprise Micro
openSUSE Leap Micro
SUSE Linux Enterprise Workstation Extension 12
SUSE Linux Enterprise Live Patching
Ubuntu
SUSE Linux Enterprise Server 15 SP4 LTSS
SUSE Linux Enterprise Desktop 15 SP4 LTSS
Public Cloud Module
Basesystem Module
Development Tools Module
Legacy Module
SUSE Real Time Module
openSUSE Leap
RecoverPoint for Virtual Machines
linux-image-lowlatency-hwe-16.04 (Ubuntu package)
linux-image-gcp-lts-18.04 (Ubuntu package)
linux-image-generic (Ubuntu package)
linux-image-kvm (Ubuntu package)
linux-image-lowlatency (Ubuntu package)
linux-image-oracle-lts-18.04 (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-gke (Ubuntu package)
linux-image-aws-lts-18.04 (Ubuntu package)
linux-image-oem (Ubuntu package)
linux-image-oracle (Ubuntu package)
linux-image-virtual-hwe-16.04 (Ubuntu package)
linux-image-4.15.0-2097-azure-fips (Ubuntu package)
linux-image-azure-fips (Ubuntu package)
linux-image-4.15.0-1188-azure (Ubuntu package)
linux-image-azure (Ubuntu package)
linux-image-azure-lts-18.04 (Ubuntu package)
linux-image-4.15.0-237-lowlatency (Ubuntu package)
linux-image-4.15.0-1135-fips (Ubuntu package)
linux-image-4.15.0-2081-gcp-fips (Ubuntu package)
linux-image-4.15.0-2118-aws-fips (Ubuntu package)
linux-image-aws-fips (Ubuntu package)
linux-image-fips (Ubuntu package)
linux-image-gcp-fips (Ubuntu package)
linux-image-4.15.0-1142-oracle (Ubuntu package)
linux-image-4.15.0-1163-kvm (Ubuntu package)
linux-image-4.15.0-1173-gcp (Ubuntu package)
linux-image-4.15.0-1180-aws (Ubuntu package)
linux-image-4.15.0-237-generic (Ubuntu package)
kgraft-patch-4_12_14-122_225-default
kgraft-patch-4_12_14-122_222-default
kernel-livepatch-5_14_21-150400_24_119-default-debuginfo
kernel-livepatch-5_14_21-150400_24_119-default
kernel-livepatch-SLE15-SP4_Update_26-debugsource
kernel-livepatch-SLE15-SP5_Update_13-debugsource
kernel-livepatch-5_14_21-150500_55_62-default
kernel-livepatch-5_14_21-150500_55_62-default-debuginfo
kernel-livepatch-5_14_21-150500_13_52-rt
kernel-livepatch-SLE15-SP5-RT_Update_14-debugsource
kernel-livepatch-5_14_21-150500_13_52-rt-debuginfo
linux (Ubuntu package)
linux-lts-xenial (Ubuntu package)
linux-fips (Ubuntu package)
linux-aws (Ubuntu package)
kernel-rt-base-debuginfo
kernel-rt_debug
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-rt-devel
ocfs2-kmp-rt-debuginfo
ocfs2-kmp-rt
kernel-rt_debug-devel-debuginfo
cluster-md-kmp-rt-debuginfo
kernel-syms-rt
kernel-rt-debuginfo
gfs2-kmp-rt-debuginfo
cluster-md-kmp-rt
kernel-source-rt
kernel-devel-rt
kernel-rt_debug-devel
kernel-rt
kernel-azure-base-debuginfo
kernel-azure-devel
kernel-azure-debuginfo
kernel-azure-base
kernel-azure
kernel-source-azure
kernel-devel-azure
kernel-azure-debugsource
kernel-syms-azure
gfs2-kmp-default-debuginfo
gfs2-kmp-default
dlm-kmp-default-debuginfo
ocfs2-kmp-default
kernel-default-base
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
kernel-default-kgraft-devel
kernel-default
kernel-devel
kernel-source
kernel-macros
kernel-default-extra-debuginfo
kernel-default-extra
kernel-default-man
kernel-obs-build
kernel-obs-build-debugsource
kernel-docs
kernel-default-devel-debuginfo
kernel-default-kgraft
linux-hwe-5.4 (Ubuntu package)
linux-iot (Ubuntu package)
linux-xilinx-zynqmp (Ubuntu package)
linux-ibm (Ubuntu package)
linux-ibm-5.4 (Ubuntu package)
linux-bluefield (Ubuntu package)
linux-aws-fips (Ubuntu package)
linux-raspi (Ubuntu package)
linux-raspi-5.4 (Ubuntu package)
linux-azure (Ubuntu package)
linux-oracle-5.4 (Ubuntu package)
linux-aws-5.4 (Ubuntu package)
linux-gcp-fips (Ubuntu package)
linux-azure-fips (Ubuntu package)
dtb-marvell
dtb-sprd
dlm-kmp-64kb-debuginfo
gfs2-kmp-64kb-debuginfo
dtb-renesas
reiserfs-kmp-64kb
kernel-kvmsmall-devel-debuginfo
dtb-altera
dtb-lg
dtb-socionext
kernel-debug-devel-debuginfo
dtb-xilinx
cluster-md-kmp-64kb
dtb-amlogic
dtb-hisilicon
dtb-broadcom
dtb-amd
ocfs2-kmp-64kb-debuginfo
dtb-exynos
kernel-64kb-extra-debuginfo
dtb-cavium
dtb-apple
dtb-qcom
dtb-freescale
kernel-kvmsmall-livepatch-devel
kselftests-kmp-64kb
dtb-rockchip
dtb-nvidia
dtb-aarch64
kernel-kvmsmall
kselftests-kmp-default-debuginfo
kselftests-kmp-default
kernel-default-optional
kernel-default-optional-debuginfo
kernel-obs-qa
kernel-kvmsmall-debuginfo
dtb-arm
kernel-kvmsmall-devel
kselftests-kmp-64kb-debuginfo
dtb-apm
kernel-kvmsmall-debugsource
ocfs2-kmp-64kb
kernel-64kb-livepatch-devel
dtb-mediatek
dtb-amazon
dlm-kmp-64kb
gfs2-kmp-64kb
reiserfs-kmp-64kb-debuginfo
reiserfs-kmp-default
kernel-64kb-debugsource
kernel-64kb-debuginfo
kernel-64kb-devel-debuginfo
kernel-64kb-devel
kernel-64kb
kernel-64kb-optional
kernel-default-livepatch
kernel-default-livepatch-devel
kernel-source-vanilla
kernel-64kb-optional-debuginfo
dtb-allwinner
kernel-64kb-extra
cluster-md-kmp-64kb-debuginfo
kernel-debug-devel
kernel-debug-debugsource
kernel-debug-livepatch-devel
kernel-debug-debuginfo
kernel-debug
kernel-docs-html
kernel-zfcpdump-debuginfo
kernel-zfcpdump-debugsource
kernel-zfcpdump
reiserfs-kmp-default-debuginfo
kernel-default-base-rebuild
kselftests-kmp-rt
kernel-rt-livepatch
kernel-rt-optional-debuginfo
kernel-rt-vdso-debuginfo
kernel-rt-vdso
reiserfs-kmp-rt-debuginfo
kernel-rt-livepatch-devel
kselftests-kmp-rt-debuginfo
kernel-rt-extra-debuginfo
reiserfs-kmp-rt
kernel-rt-extra
kernel-rt-optional
kernel-rt_debug-livepatch-devel
kernel-rt_debug-vdso
kernel-rt_debug-vdso-debuginfo
reiserfs-kmp-azure-debuginfo
kernel-azure-optional
kernel-azure-optional-debuginfo
kernel-azure-extra
cluster-md-kmp-azure
kernel-azure-livepatch-devel
dlm-kmp-azure-debuginfo
kselftests-kmp-azure
dlm-kmp-azure
gfs2-kmp-azure-debuginfo
kernel-azure-extra-debuginfo
kselftests-kmp-azure-debuginfo
ocfs2-kmp-azure
kernel-azure-devel-debuginfo
gfs2-kmp-azure
kernel-azure-vdso-debuginfo
kernel-azure-vdso
reiserfs-kmp-azure
ocfs2-kmp-azure-debuginfo
cluster-md-kmp-azure-debuginfo
kernel-debug-vdso
kernel-debug-vdso-debuginfo
kernel-default-vdso-debuginfo
kernel-kvmsmall-vdso-debuginfo
kernel-kvmsmall-vdso
kernel-default-vdso
Dell EMC Storage Monitoring and Reporting (SMR)
Storage Resource Manager
Dell Secure Connect Gateway
Dell EMC VxRail Appliance

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

The vulnerability exists due to an out-of-bounds read error within the resp_readcap16() function in drivers/scsi/scsi_debug.c. A local user can perform a denial of service (DoS) attack.

Install update from vendor's website.

• https://git.kernel.org/stable/c/3e20cb072679bdb47747ccc8bee3233a4cf0765a
• https://git.kernel.org/stable/c/5b8bed6464ad6653586e30df046185fd816ad999
• https://git.kernel.org/stable/c/4e3ace0051e7e504b55d239daab8789dd89b863c
• https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.82
• https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15.5
• https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.16