Use-after-free in Linux kernel - CVE-2021-46966

Vulnerability identifier: #VU88893

CSH Severity: Low

CVSS v4 BT: 5.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-46966

CWE-ID: CWE-416

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to a use-after-free error within the cm_write() function in drivers/acpi/custom_method.c. A local user can trigger a use-after-free error and escalate privileges on the system.

Linux kernel
SUSE Linux Enterprise High Performance Computing 12
SUSE Linux Enterprise High Availability Extension 12
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise Software Development Kit 12
SUSE Linux Enterprise Server for SAP Applications 12
SUSE Linux Enterprise Real Time 12
SUSE Linux Enterprise Live Patching
SUSE Linux Enterprise Workstation Extension 12
Ubuntu
openEuler
Dell Data Protection Central
PowerProtect DP Series Appliance (IDPA)
EMC Cloud Tiering Appliance
linux-image-4.4.0-1168-aws (Ubuntu package)
linux-image-4.4.0-253-generic (Ubuntu package)
linux-image-4.4.0-253-lowlatency (Ubuntu package)
linux-image-aws (Ubuntu package)
linux-image-generic (Ubuntu package)
linux-image-generic-lts-xenial (Ubuntu package)
linux-image-kvm (Ubuntu package)
linux-image-lowlatency (Ubuntu package)
linux-image-lowlatency-lts-xenial (Ubuntu package)
linux-image-virtual (Ubuntu package)
linux-image-virtual-lts-xenial (Ubuntu package)
linux-image-4.4.0-1130-aws (Ubuntu package)
linux-image-4.4.0-1131-kvm (Ubuntu package)
kgraft-patch-4_12_14-122_212-default
kernel-source-rt
kernel-rt-base
gfs2-kmp-rt-debuginfo
kernel-rt-base-debuginfo
kernel-rt-devel-debuginfo
kernel-syms-rt
kernel-rt_debug-debugsource
ocfs2-kmp-rt
dlm-kmp-rt
kernel-rt_debug-debuginfo
cluster-md-kmp-rt-debuginfo
kernel-rt-devel
gfs2-kmp-rt
cluster-md-kmp-rt
kernel-rt-debugsource
kernel-rt-debuginfo
dlm-kmp-rt-debuginfo
ocfs2-kmp-rt-debuginfo
kernel-rt_debug-devel-debuginfo
kernel-rt_debug-devel
kernel-devel-rt
kernel-rt_debug
kernel-rt
kernel-devel-azure
kernel-source-azure
kernel-azure
kernel-azure-base-debuginfo
kernel-syms-azure
kernel-azure-debuginfo
kernel-azure-debugsource
kernel-azure-devel
kernel-azure-base
kernel-default-devel
kernel-default-kgraft-devel
dlm-kmp-default
ocfs2-kmp-default-debuginfo
kernel-default-debugsource
gfs2-kmp-default-debuginfo
gfs2-kmp-default
dlm-kmp-default-debuginfo
kernel-default-base-debuginfo
kernel-default-debuginfo
kernel-default-extra-debuginfo
kernel-default-extra
kernel-default-man
kernel-obs-build-debugsource
kernel-obs-build
kernel-docs
kernel-default-kgraft
kernel-devel
kernel-default-devel-debuginfo
kernel-default-base
kernel-macros
kernel-source
kernel-default
cluster-md-kmp-default
cluster-md-kmp-default-debuginfo
ocfs2-kmp-default
kernel-syms
perf
bpftool
python3-perf-debuginfo
perf-debuginfo
kernel-tools
kernel-tools-devel
kernel-debuginfo
python2-perf
bpftool-debuginfo
kernel-tools-debuginfo
python3-perf
kernel-debugsource
python2-perf-debuginfo
kernel

Install updates from vendor's website.

Linux kernel - addressed in versions 4.4.269, 4.9.269, 4.14.233, 4.19.191, 5.4.118, 5.10.36, 5.11.20, 5.12.3, 5.13
linux-image-4.4.0-1168-aws (Ubuntu package) - update to Ubuntu Pro
linux-image-4.4.0-253-generic (Ubuntu package) - update to Ubuntu Pro
linux-image-4.4.0-253-lowlatency (Ubuntu package) - update to Ubuntu Pro
linux-image-aws (Ubuntu package) - update to Ubuntu Pro (Infra-only)
linux-image-generic (Ubuntu package) - update to Ubuntu Pro (Infra-only)
linux-image-generic-lts-xenial (Ubuntu package) - update to Ubuntu Pro (Infra-only)
linux-image-kvm (Ubuntu package) - update to Ubuntu Pro (Infra-only)
linux-image-lowlatency (Ubuntu package) - update to Ubuntu Pro (Infra-only)
linux-image-lowlatency-lts-xenial (Ubuntu package) - update to Ubuntu Pro (Infra-only)
linux-image-virtual (Ubuntu package) - update to Ubuntu Pro (Infra-only)
linux-image-virtual-lts-xenial (Ubuntu package) - update to Ubuntu Pro (Infra-only)
linux-image-4.4.0-1130-aws (Ubuntu package) - update to Ubuntu Pro
linux-image-4.4.0-1131-kvm (Ubuntu package) - update to Ubuntu Pro
kgraft-patch-4_12_14-122_212-default - update to 1-8.11.1
kernel-source-rt - update to 4.12.14-10.182.1
kernel-rt-base - update to 4.12.14-10.182.1
gfs2-kmp-rt-debuginfo - update to 4.12.14-10.182.1
kernel-rt-base-debuginfo - update to 4.12.14-10.182.1
kernel-rt-devel-debuginfo - update to 4.12.14-10.182.1
kernel-syms-rt - update to 4.12.14-10.182.1
kernel-rt_debug-debugsource - update to 4.12.14-10.182.1
ocfs2-kmp-rt - update to 4.12.14-10.182.1
dlm-kmp-rt - update to 4.12.14-10.182.1
kernel-rt_debug-debuginfo - update to 4.12.14-10.182.1
cluster-md-kmp-rt-debuginfo - update to 4.12.14-10.182.1
kernel-rt-devel - update to 4.12.14-10.182.1
gfs2-kmp-rt - update to 4.12.14-10.182.1
cluster-md-kmp-rt - update to 4.12.14-10.182.1
kernel-rt-debugsource - update to 4.12.14-10.182.1
kernel-rt-debuginfo - update to 4.12.14-10.182.1
dlm-kmp-rt-debuginfo - update to 4.12.14-10.182.1
ocfs2-kmp-rt-debuginfo - update to 4.12.14-10.182.1
kernel-rt_debug-devel-debuginfo - update to 4.12.14-10.182.1
kernel-rt_debug-devel - update to 4.12.14-10.182.1
kernel-devel-rt - update to 4.12.14-10.182.1
kernel-rt_debug - update to 4.12.14-10.182.1
kernel-rt - update to 4.12.14-10.182.1
kernel-devel-azure - update to 4.12.14-16.182.1
kernel-source-azure - update to 4.12.14-16.182.1
kernel-azure - update to 4.12.14-16.182.1
kernel-azure-base-debuginfo - update to 4.12.14-16.182.1
kernel-syms-azure - update to 4.12.14-16.182.1
kernel-azure-debuginfo - update to 4.12.14-16.182.1
kernel-azure-debugsource - update to 4.12.14-16.182.1
kernel-azure-devel - update to 4.12.14-16.182.1
kernel-azure-base - update to 4.12.14-16.182.1
kernel-default-devel - update to 4.12.14-122.212.1
kernel-default-kgraft-devel - update to 4.12.14-122.212.1
dlm-kmp-default - update to 4.12.14-122.212.1
ocfs2-kmp-default-debuginfo - update to 4.12.14-122.212.1
kernel-default-debugsource - update to 4.12.14-122.212.1
gfs2-kmp-default-debuginfo - update to 4.12.14-122.212.1
gfs2-kmp-default - update to 4.12.14-122.212.1
dlm-kmp-default-debuginfo - update to 4.12.14-122.212.1
kernel-default-base-debuginfo - update to 4.12.14-122.212.1
kernel-default-debuginfo - update to 4.12.14-122.212.1
kernel-default-extra-debuginfo - update to 4.12.14-122.212.1
kernel-default-extra - update to 4.12.14-122.212.1
kernel-default-man - update to 4.12.14-122.212.1
kernel-obs-build-debugsource - update to 4.12.14-122.212.1
kernel-obs-build - update to 4.12.14-122.212.1
kernel-docs - update to 4.12.14-122.212.1
kernel-default-kgraft - update to 4.12.14-122.212.1
kernel-devel - update to 4.12.14-122.212.1
kernel-default-devel-debuginfo - update to 4.12.14-122.212.1
kernel-default-base - update to 4.12.14-122.212.1
kernel-macros - update to 4.12.14-122.212.1
kernel-source - update to 4.12.14-122.212.1
kernel-default - update to 4.12.14-122.212.1
cluster-md-kmp-default - update to 4.12.14-122.212.1
cluster-md-kmp-default-debuginfo - update to 4.12.14-122.212.1
ocfs2-kmp-default - update to 4.12.14-122.212.1
kernel-syms - update to 4.12.14-122.212.1
perf - update to 4.19.90-2405.1.0.0248
bpftool - update to 4.19.90-2405.1.0.0248
kernel-devel - update to 4.19.90-2405.1.0.0248
python3-perf-debuginfo - update to 4.19.90-2405.1.0.0248
perf-debuginfo - update to 4.19.90-2405.1.0.0248
kernel-tools - update to 4.19.90-2405.1.0.0248
kernel-tools-devel - update to 4.19.90-2405.1.0.0248
kernel-debuginfo - update to 4.19.90-2405.1.0.0248
python2-perf - update to 4.19.90-2405.1.0.0248
bpftool-debuginfo - update to 4.19.90-2405.1.0.0248
kernel-tools-debuginfo - update to 4.19.90-2405.1.0.0248
kernel-source - update to 4.19.90-2405.1.0.0248
python3-perf - update to 4.19.90-2405.1.0.0248
kernel-debugsource - update to 4.19.90-2405.1.0.0248
python2-perf-debuginfo - update to 4.19.90-2405.1.0.0248
kernel - update to 4.19.90-2405.1.0.0248
EMC Cloud Tiering Appliance - update to 13.2.0.2.29

• https://git.kernel.org/stable/c/1d53ca5d131074c925ce38361fb0376d3bf7e394
• https://git.kernel.org/stable/c/8b04d57f30caf76649d0567551589af9a66ca9be
• https://git.kernel.org/stable/c/90575d1d9311b753cf1718f4ce9061ddda7dfd23
• https://git.kernel.org/stable/c/a5b26a2e362f572d87e9fd35435680e557052a17
• https://git.kernel.org/stable/c/72814a94c38a33239793f7622cec6ace1e540c4b
• https://git.kernel.org/stable/c/62dc2440ebb552aa0d7f635e1697e077d9d21203
• https://git.kernel.org/stable/c/f16737caf41fc06cfe6e49048becb09657074d4b
• https://git.kernel.org/stable/c/b7a5baaae212a686ceb812c32fceed79c03c0234
• https://git.kernel.org/stable/c/e483bb9a991bdae29a0caa4b3a6d002c968f94aa
• https://mirrors.edge.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.233
• https://mirrors.edge.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.19.191
• https://mirrors.edge.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.4.269
• https://mirrors.edge.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.9.269
• https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.36
• https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.11.20
• https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.12.3
• https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.13
• https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4.118

• Privilege escalation in Linux kernel ACPI
• Ubuntu update for linux
• Multiple vulnerabilities in Dell Cloud Tiering Appliance
• openEuler 20.03 LTS SP1 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
• Multiple vulnerabilities in Dell Data Protection Central