Use-after-free in Linux kernel - CVE-2020-27784

CSH
CYBERSECURITY HELP
Sign In REGISTER
 
Main Vulnerability Database Vulnerabilities #VU67511

Use-after-free in Linux kernel - CVE-2020-27784

Published: September 20, 2022


Vulnerability identifier: #VU67511
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-2020-27784
CWE-ID: CWE-416
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 a use-after-free error when accessing a deallocated instance in printer_ioctl(). A local user can trigger a use-after-free error and crash the kernel.



Affected software

Linux kernel
SUSE Manager Proxy
SUSE Manager Retail Branch Server
SUSE Manager Server
SUSE Linux Enterprise Micro
openSUSE Leap Micro
SUSE Linux Enterprise Storage
SUSE Enterprise Storage
SUSE Linux Enterprise Server
SUSE Linux Enterprise High Performance Computing
SUSE Linux Enterprise Server for SAP Applications
SUSE Linux Enterprise High Availability
SUSE Linux Enterprise Module for Live Patching
SUSE Linux Enterprise Server for SAP
SUSE Linux Enterprise Module for Public Cloud
SUSE Linux Enterprise Module for Realtime
SUSE Linux Enterprise Real Time
SUSE Linux Enterprise Workstation Extension
SUSE Linux Enterprise Module for Legacy Software
SUSE Linux Enterprise Module for Development Tools
SUSE Linux Enterprise Module for Basesystem
SUSE Linux Enterprise Desktop
openSUSE Leap
openEuler
kernel-livepatch-SLE15-SP2_Update_30-debugsource
kernel-livepatch-5_3_18-150200_24_129-default-debuginfo
kernel-livepatch-5_3_18-150200_24_129-default
kernel-livepatch-5_3_18-150300_59_93-default
python3-perf
bpftool-debuginfo
python2-perf
perf
kernel
kernel-devel
bpftool
kernel-debugsource
python3-perf-debuginfo
kernel-source
kernel-tools-debuginfo
perf-debuginfo
kernel-debuginfo
kernel-tools
kernel-tools-devel
python2-perf-debuginfo
dlm-kmp-default
dlm-kmp-default-debuginfo
gfs2-kmp-default
gfs2-kmp-default-debuginfo
ocfs2-kmp-default
ocfs2-kmp-default-debuginfo
cluster-md-kmp-default-debuginfo
cluster-md-kmp-default
kernel-default-livepatch-devel
kernel-default-livepatch
kernel-preempt-devel-debuginfo
kernel-preempt-devel
kernel-preempt-debugsource
kernel-preempt
kernel-default
kernel-default-debuginfo
kernel-default-debugsource
kernel-default-devel
kernel-default-devel-debuginfo
kernel-obs-build
kernel-obs-build-debugsource
kernel-syms
reiserfs-kmp-default
reiserfs-kmp-default-debuginfo
kernel-docs
kernel-macros
kernel-preempt-debuginfo
kernel-default-base
dlm-kmp-azure-debuginfo
kernel-source-azure
reiserfs-kmp-azure-debuginfo
reiserfs-kmp-azure
ocfs2-kmp-azure-debuginfo
ocfs2-kmp-azure
kselftests-kmp-azure-debuginfo
kselftests-kmp-azure
kernel-syms-azure
kernel-azure-optional-debuginfo
kernel-azure-optional
kernel-azure-livepatch-devel
kernel-azure-extra-debuginfo
kernel-azure-extra
kernel-azure-devel
kernel-devel-azure
cluster-md-kmp-azure
cluster-md-kmp-azure-debuginfo
dlm-kmp-azure
kernel-azure-devel-debuginfo
gfs2-kmp-azure
gfs2-kmp-azure-debuginfo
kernel-azure
kernel-azure-debuginfo
kernel-azure-debugsource
ocfs2-kmp-64kb-debuginfo
reiserfs-kmp-64kb
reiserfs-kmp-64kb-debuginfo
kernel-docs-html
kernel-source-vanilla
kernel-zfcpdump-debuginfo
kernel-zfcpdump-debugsource
kernel-zfcpdump
kernel-kvmsmall-devel
kernel-debug
kernel-debug-debuginfo
kernel-debug-debugsource
kernel-debug-devel
kernel-debug-devel-debuginfo
kernel-debug-livepatch-devel
kernel-kvmsmall
kernel-kvmsmall-debuginfo
kernel-kvmsmall-debugsource
kernel-kvmsmall-devel-debuginfo
kernel-kvmsmall-livepatch-devel
cluster-md-kmp-preempt
cluster-md-kmp-preempt-debuginfo
dlm-kmp-preempt
dlm-kmp-preempt-debuginfo
gfs2-kmp-preempt
gfs2-kmp-preempt-debuginfo
kernel-default-extra
dtb-al
dtb-zte
kselftests-kmp-64kb-debuginfo
kernel-default-extra-debuginfo
kernel-default-optional
kernel-default-optional-debuginfo
kernel-obs-qa
kselftests-kmp-default
kselftests-kmp-default-debuginfo
dtb-rockchip
kernel-64kb-extra-debuginfo
kernel-64kb-extra
kernel-64kb-devel-debuginfo
kernel-64kb-devel
kernel-64kb-debugsource
kernel-64kb-debuginfo
kernel-64kb
gfs2-kmp-64kb-debuginfo
gfs2-kmp-64kb
dtb-xilinx
dtb-sprd
dtb-socionext
kernel-64kb-livepatch-devel
dtb-renesas
dtb-arm
dtb-broadcom
dtb-cavium
dtb-exynos
dtb-freescale
dtb-hisilicon
dtb-lg
dtb-marvell
dtb-mediatek
dtb-nvidia
dtb-qcom
dlm-kmp-64kb
kernel-preempt-extra
kernel-preempt-extra-debuginfo
kernel-preempt-livepatch-devel
kernel-preempt-optional
kernel-preempt-optional-debuginfo
kselftests-kmp-preempt
kselftests-kmp-preempt-debuginfo
ocfs2-kmp-preempt
ocfs2-kmp-preempt-debuginfo
reiserfs-kmp-preempt
reiserfs-kmp-preempt-debuginfo
cluster-md-kmp-64kb
cluster-md-kmp-64kb-debuginfo
dlm-kmp-64kb-debuginfo
dtb-allwinner
dtb-altera
dtb-amd
dtb-amlogic
dtb-apm
ocfs2-kmp-64kb
kselftests-kmp-64kb
kernel-64kb-optional-debuginfo
kernel-64kb-optional
kernel-default-base-rebuild
gfs2-kmp-rt-debuginfo
kernel-rt
kernel-rt-debuginfo
kernel-rt-debugsource
kernel-devel-rt
kernel-source-rt
cluster-md-kmp-rt
cluster-md-kmp-rt-debuginfo
dlm-kmp-rt
dlm-kmp-rt-debuginfo
gfs2-kmp-rt
kernel-rt-devel
kernel-rt-devel-debuginfo
kernel-rt_debug-debuginfo
kernel-rt_debug-debugsource
kernel-rt_debug-devel
kernel-rt_debug-devel-debuginfo
kernel-syms-rt
ocfs2-kmp-rt
ocfs2-kmp-rt-debuginfo
Dell EMC VxRail Appliance

How to mitigate CVE-2020-27784

Install updates from vendor's website.

kernel-livepatch-SLE15-SP2_Update_30-debugsource - update to 1-150200.5.3.1
kernel-livepatch-5_3_18-150200_24_129-default-debuginfo - update to 1-150200.5.3.1
kernel-livepatch-5_3_18-150200_24_129-default - update to 1-150200.5.3.1
kernel-livepatch-5_3_18-150300_59_93-default - update to 1-150300.7.3.1
python3-perf - update to 4.19.90-2209.4.0.0168
bpftool-debuginfo - update to 4.19.90-2209.4.0.0168
python2-perf - update to 4.19.90-2209.4.0.0168
perf - update to 4.19.90-2209.4.0.0168
kernel - update to 4.19.90-2209.4.0.0168
kernel-devel - update to 4.19.90-2209.4.0.0168
bpftool - update to 4.19.90-2209.4.0.0168
kernel-debugsource - update to 4.19.90-2209.4.0.0168
python3-perf-debuginfo - update to 4.19.90-2209.4.0.0168
kernel-source - update to 4.19.90-2209.4.0.0168
kernel-tools-debuginfo - update to 4.19.90-2209.4.0.0168
perf-debuginfo - update to 4.19.90-2209.4.0.0168
kernel-debuginfo - update to 4.19.90-2209.4.0.0168
kernel-tools - update to 4.19.90-2209.4.0.0168
kernel-tools-devel - update to 4.19.90-2209.4.0.0168
python2-perf-debuginfo - update to 4.19.90-2209.4.0.0168
dlm-kmp-default - addressed in versions 5.3.18-150200.24.129.1, 5.3.18-150300.59.93.1
dlm-kmp-default-debuginfo - addressed in versions 5.3.18-150200.24.129.1, 5.3.18-150300.59.93.1
gfs2-kmp-default - addressed in versions 5.3.18-150200.24.129.1, 5.3.18-150300.59.93.1
gfs2-kmp-default-debuginfo - addressed in versions 5.3.18-150200.24.129.1, 5.3.18-150300.59.93.1
ocfs2-kmp-default - addressed in versions 5.3.18-150200.24.129.1, 5.3.18-150300.59.93.1
ocfs2-kmp-default-debuginfo - addressed in versions 5.3.18-150200.24.129.1, 5.3.18-150300.59.93.1
cluster-md-kmp-default-debuginfo - addressed in versions 5.3.18-150200.24.129.1, 5.3.18-150300.59.93.1
cluster-md-kmp-default - addressed in versions 5.3.18-150200.24.129.1, 5.3.18-150300.59.93.1
kernel-default-livepatch-devel - addressed in versions 5.3.18-150200.24.129.1, 5.3.18-150300.59.93.1
kernel-default-livepatch - addressed in versions 5.3.18-150200.24.129.1, 5.3.18-150300.59.93.1
kernel-preempt-devel-debuginfo - addressed in versions 5.3.18-150200.24.129.1, 5.3.18-150300.59.93.1
kernel-preempt-devel - addressed in versions 5.3.18-150200.24.129.1, 5.3.18-150300.59.93.1
kernel-preempt-debugsource - addressed in versions 5.3.18-150200.24.129.1, 5.3.18-150300.59.93.1
kernel-preempt - addressed in versions 5.3.18-150200.24.129.1, 5.3.18-150300.59.93.1
kernel-source - addressed in versions 5.3.18-150200.24.129.1, 5.3.18-150300.59.93.1
kernel-default - addressed in versions 5.3.18-150200.24.129.1, 5.3.18-150300.59.93.1
kernel-default-debuginfo - addressed in versions 5.3.18-150200.24.129.1, 5.3.18-150300.59.93.1
kernel-default-debugsource - addressed in versions 5.3.18-150200.24.129.1, 5.3.18-150300.59.93.1
kernel-default-devel - addressed in versions 5.3.18-150200.24.129.1, 5.3.18-150300.59.93.1
kernel-default-devel-debuginfo - addressed in versions 5.3.18-150200.24.129.1, 5.3.18-150300.59.93.1
kernel-obs-build - addressed in versions 5.3.18-150200.24.129.1, 5.3.18-150300.59.93.1
kernel-obs-build-debugsource - addressed in versions 5.3.18-150200.24.129.1, 5.3.18-150300.59.93.1
kernel-syms - addressed in versions 5.3.18-150200.24.129.1, 5.3.18-150300.59.93.1
reiserfs-kmp-default - addressed in versions 5.3.18-150200.24.129.1, 5.3.18-150300.59.93.1
reiserfs-kmp-default-debuginfo - addressed in versions 5.3.18-150200.24.129.1, 5.3.18-150300.59.93.1
kernel-devel - addressed in versions 5.3.18-150200.24.129.1, 5.3.18-150300.59.93.1
kernel-docs - addressed in versions 5.3.18-150200.24.129.1, 5.3.18-150300.59.93.1
kernel-macros - addressed in versions 5.3.18-150200.24.129.1, 5.3.18-150300.59.93.1
kernel-preempt-debuginfo - addressed in versions 5.3.18-150200.24.129.1, 5.3.18-150300.59.93.1
kernel-default-base - addressed in versions 5.3.18-150200.24.129.1.150200.9.61.1, 5.3.18-150300.59.93.1.150300.18.54.1
dlm-kmp-azure-debuginfo - update to 5.3.18-150300.38.80.1
kernel-source-azure - update to 5.3.18-150300.38.80.1
reiserfs-kmp-azure-debuginfo - update to 5.3.18-150300.38.80.1
reiserfs-kmp-azure - update to 5.3.18-150300.38.80.1
ocfs2-kmp-azure-debuginfo - update to 5.3.18-150300.38.80.1
ocfs2-kmp-azure - update to 5.3.18-150300.38.80.1
kselftests-kmp-azure-debuginfo - update to 5.3.18-150300.38.80.1
kselftests-kmp-azure - update to 5.3.18-150300.38.80.1
kernel-syms-azure - update to 5.3.18-150300.38.80.1
kernel-azure-optional-debuginfo - update to 5.3.18-150300.38.80.1
kernel-azure-optional - update to 5.3.18-150300.38.80.1
kernel-azure-livepatch-devel - update to 5.3.18-150300.38.80.1
kernel-azure-extra-debuginfo - update to 5.3.18-150300.38.80.1
kernel-azure-extra - update to 5.3.18-150300.38.80.1
kernel-azure-devel - update to 5.3.18-150300.38.80.1
kernel-devel-azure - update to 5.3.18-150300.38.80.1
cluster-md-kmp-azure - update to 5.3.18-150300.38.80.1
cluster-md-kmp-azure-debuginfo - update to 5.3.18-150300.38.80.1
dlm-kmp-azure - update to 5.3.18-150300.38.80.1
kernel-azure-devel-debuginfo - update to 5.3.18-150300.38.80.1
gfs2-kmp-azure - update to 5.3.18-150300.38.80.1
gfs2-kmp-azure-debuginfo - update to 5.3.18-150300.38.80.1
kernel-azure - update to 5.3.18-150300.38.80.1
kernel-azure-debuginfo - update to 5.3.18-150300.38.80.1
kernel-azure-debugsource - update to 5.3.18-150300.38.80.1
ocfs2-kmp-64kb-debuginfo - update to 5.3.18-150300.59.93.1
reiserfs-kmp-64kb - update to 5.3.18-150300.59.93.1
reiserfs-kmp-64kb-debuginfo - update to 5.3.18-150300.59.93.1
kernel-docs-html - update to 5.3.18-150300.59.93.1
kernel-source-vanilla - update to 5.3.18-150300.59.93.1
kernel-zfcpdump-debuginfo - update to 5.3.18-150300.59.93.1
kernel-zfcpdump-debugsource - update to 5.3.18-150300.59.93.1
kernel-zfcpdump - update to 5.3.18-150300.59.93.1
kernel-kvmsmall-devel - update to 5.3.18-150300.59.93.1
kernel-debug - update to 5.3.18-150300.59.93.1
kernel-debug-debuginfo - update to 5.3.18-150300.59.93.1
kernel-debug-debugsource - update to 5.3.18-150300.59.93.1
kernel-debug-devel - update to 5.3.18-150300.59.93.1
kernel-debug-devel-debuginfo - update to 5.3.18-150300.59.93.1
kernel-debug-livepatch-devel - update to 5.3.18-150300.59.93.1
kernel-kvmsmall - update to 5.3.18-150300.59.93.1
kernel-kvmsmall-debuginfo - update to 5.3.18-150300.59.93.1
kernel-kvmsmall-debugsource - update to 5.3.18-150300.59.93.1
kernel-kvmsmall-devel-debuginfo - update to 5.3.18-150300.59.93.1
kernel-kvmsmall-livepatch-devel - update to 5.3.18-150300.59.93.1
cluster-md-kmp-preempt - update to 5.3.18-150300.59.93.1
cluster-md-kmp-preempt-debuginfo - update to 5.3.18-150300.59.93.1
dlm-kmp-preempt - update to 5.3.18-150300.59.93.1
dlm-kmp-preempt-debuginfo - update to 5.3.18-150300.59.93.1
gfs2-kmp-preempt - update to 5.3.18-150300.59.93.1
gfs2-kmp-preempt-debuginfo - update to 5.3.18-150300.59.93.1
kernel-default-extra - update to 5.3.18-150300.59.93.1
dtb-al - update to 5.3.18-150300.59.93.1
dtb-zte - update to 5.3.18-150300.59.93.1
kselftests-kmp-64kb-debuginfo - update to 5.3.18-150300.59.93.1
kernel-default-extra-debuginfo - update to 5.3.18-150300.59.93.1
kernel-default-optional - update to 5.3.18-150300.59.93.1
kernel-default-optional-debuginfo - update to 5.3.18-150300.59.93.1
kernel-obs-qa - update to 5.3.18-150300.59.93.1
kselftests-kmp-default - update to 5.3.18-150300.59.93.1
kselftests-kmp-default-debuginfo - update to 5.3.18-150300.59.93.1
dtb-rockchip - update to 5.3.18-150300.59.93.1
kernel-64kb-extra-debuginfo - update to 5.3.18-150300.59.93.1
kernel-64kb-extra - update to 5.3.18-150300.59.93.1
kernel-64kb-devel-debuginfo - update to 5.3.18-150300.59.93.1
kernel-64kb-devel - update to 5.3.18-150300.59.93.1
kernel-64kb-debugsource - update to 5.3.18-150300.59.93.1
kernel-64kb-debuginfo - update to 5.3.18-150300.59.93.1
kernel-64kb - update to 5.3.18-150300.59.93.1
gfs2-kmp-64kb-debuginfo - update to 5.3.18-150300.59.93.1
gfs2-kmp-64kb - update to 5.3.18-150300.59.93.1
dtb-xilinx - update to 5.3.18-150300.59.93.1
dtb-sprd - update to 5.3.18-150300.59.93.1
dtb-socionext - update to 5.3.18-150300.59.93.1
kernel-64kb-livepatch-devel - update to 5.3.18-150300.59.93.1
dtb-renesas - update to 5.3.18-150300.59.93.1
dtb-arm - update to 5.3.18-150300.59.93.1
dtb-broadcom - update to 5.3.18-150300.59.93.1
dtb-cavium - update to 5.3.18-150300.59.93.1
dtb-exynos - update to 5.3.18-150300.59.93.1
dtb-freescale - update to 5.3.18-150300.59.93.1
dtb-hisilicon - update to 5.3.18-150300.59.93.1
dtb-lg - update to 5.3.18-150300.59.93.1
dtb-marvell - update to 5.3.18-150300.59.93.1
dtb-mediatek - update to 5.3.18-150300.59.93.1
dtb-nvidia - update to 5.3.18-150300.59.93.1
dtb-qcom - update to 5.3.18-150300.59.93.1
dlm-kmp-64kb - update to 5.3.18-150300.59.93.1
kernel-preempt-extra - update to 5.3.18-150300.59.93.1
kernel-preempt-extra-debuginfo - update to 5.3.18-150300.59.93.1
kernel-preempt-livepatch-devel - update to 5.3.18-150300.59.93.1
kernel-preempt-optional - update to 5.3.18-150300.59.93.1
kernel-preempt-optional-debuginfo - update to 5.3.18-150300.59.93.1
kselftests-kmp-preempt - update to 5.3.18-150300.59.93.1
kselftests-kmp-preempt-debuginfo - update to 5.3.18-150300.59.93.1
ocfs2-kmp-preempt - update to 5.3.18-150300.59.93.1
ocfs2-kmp-preempt-debuginfo - update to 5.3.18-150300.59.93.1
reiserfs-kmp-preempt - update to 5.3.18-150300.59.93.1
reiserfs-kmp-preempt-debuginfo - update to 5.3.18-150300.59.93.1
cluster-md-kmp-64kb - update to 5.3.18-150300.59.93.1
cluster-md-kmp-64kb-debuginfo - update to 5.3.18-150300.59.93.1
dlm-kmp-64kb-debuginfo - update to 5.3.18-150300.59.93.1
dtb-allwinner - update to 5.3.18-150300.59.93.1
dtb-altera - update to 5.3.18-150300.59.93.1
dtb-amd - update to 5.3.18-150300.59.93.1
dtb-amlogic - update to 5.3.18-150300.59.93.1
dtb-apm - update to 5.3.18-150300.59.93.1
ocfs2-kmp-64kb - update to 5.3.18-150300.59.93.1
kselftests-kmp-64kb - update to 5.3.18-150300.59.93.1
kernel-64kb-optional-debuginfo - update to 5.3.18-150300.59.93.1
kernel-64kb-optional - update to 5.3.18-150300.59.93.1
kernel-default-base-rebuild - update to 5.3.18-150300.59.93.1.150300.18.54.1
gfs2-kmp-rt-debuginfo - update to 5.3.18-150300.106.1
kernel-rt - update to 5.3.18-150300.106.1
kernel-rt-debuginfo - update to 5.3.18-150300.106.1
kernel-rt-debugsource - update to 5.3.18-150300.106.1
kernel-devel-rt - update to 5.3.18-150300.106.1
kernel-source-rt - update to 5.3.18-150300.106.1
cluster-md-kmp-rt - update to 5.3.18-150300.106.1
cluster-md-kmp-rt-debuginfo - update to 5.3.18-150300.106.1
dlm-kmp-rt - update to 5.3.18-150300.106.1
dlm-kmp-rt-debuginfo - update to 5.3.18-150300.106.1
gfs2-kmp-rt - update to 5.3.18-150300.106.1
kernel-rt-devel - update to 5.3.18-150300.106.1
kernel-rt-devel-debuginfo - update to 5.3.18-150300.106.1
kernel-rt_debug-debuginfo - update to 5.3.18-150300.106.1
kernel-rt_debug-debugsource - update to 5.3.18-150300.106.1
kernel-rt_debug-devel - update to 5.3.18-150300.106.1
kernel-rt_debug-devel-debuginfo - update to 5.3.18-150300.106.1
kernel-syms-rt - update to 5.3.18-150300.106.1
ocfs2-kmp-rt - update to 5.3.18-150300.106.1
ocfs2-kmp-rt-debuginfo - update to 5.3.18-150300.106.1
Dell EMC VxRail Appliance - update to 8.0.000

External References

Related Security Bulletins