Double Free in Linux kernel - CVE-2021-34981

Vulnerability identifier: #VU77325

CSH Severity: Low

CVSS v4: 7.1 [CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2021-34981

CWE-ID: CWE-415

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 boundary error within the CMTP module in Linux kernel. A local user can trigger a double free error and execute arbitrary code on the system.

Linux kernel
SUSE CaaS Platform
SUSE MicroOS
SUSE Enterprise Storage
HPE Helion Openstack
SUSE OpenStack Cloud
SUSE OpenStack Cloud Crowbar
SUSE Linux Enterprise Server
SUSE Linux Enterprise Server for SAP
SUSE Linux Enterprise High Availability
SUSE Linux Enterprise Live Patching
SUSE Linux Enterprise Workstation Extension
SUSE Linux Enterprise Real Time Extension
SUSE Linux Enterprise Software Development Kit
SUSE Linux Enterprise High Performance Computing
SUSE Linux Enterprise Module for Live Patching
SUSE Linux Enterprise Module for Basesystem
SUSE Linux Enterprise Module for Development Tools
SUSE Linux Enterprise Module for Legacy Software
SUSE Linux Enterprise Module for Realtime
SUSE Linux Enterprise Module for Public Cloud
Oracle VM Server for x86
kernel-livepatch-4_12_14-150_78-default
kernel-livepatch-4_12_14-150_78-default-debuginfo
kernel-livepatch-4_12_14-197_102-default
kgraft-patch-4_4_180-94_150-default
kgraft-patch-4_4_180-94_150-default-debuginfo
kernel-livepatch-SLE15-SP2_Update_22-debugsource
kernel-livepatch-5_3_18-24_96-default-debuginfo
kernel-livepatch-5_3_18-24_96-default
kgraft-patch-4_12_14-95_83-default
kernel-livepatch-5_3_18-59_37-default
kernel-livepatch-5_3_18-59_37-default-debuginfo
kernel-livepatch-SLE15-SP3_Update_10-debugsource
kgraft-patch-4_12_14-122_103-default
kernel-default-base
kernel-default
kernel-default-devel
kernel-ec2
kernel-ec2-base
kernel-trace-base
kernel-trace
kernel-trace-devel
kernel-xen-devel
kernel-xen-base
kernel-ec2-devel
kernel-source
kernel-syms
kernel-xen
kernel-default-debuginfo
kernel-default-debugsource
kernel-default-base-debuginfo
kernel-macros
kernel-devel
dlm-kmp-default
dlm-kmp-default-debuginfo
cluster-md-kmp-default-debuginfo
cluster-md-kmp-default
kernel-default-man
kernel-default-kgraft
gfs2-kmp-default
gfs2-kmp-default-debuginfo
ocfs2-kmp-default
ocfs2-kmp-default-debuginfo
kernel-rt-debugsource
kernel-syms-rt
kernel-rt-debuginfo
kernel-rt-base-debuginfo
kernel-rt-base
kernel-rt
gfs2-kmp-rt-debuginfo
gfs2-kmp-rt
dlm-kmp-rt-debuginfo
dlm-kmp-rt
cluster-md-kmp-rt-debuginfo
cluster-md-kmp-rt
kernel-source-rt
kernel-devel-rt
ocfs2-kmp-rt-debuginfo
ocfs2-kmp-rt
kernel-rt_debug-devel-debuginfo
kernel-rt_debug-devel
kernel-rt_debug-debugsource
kernel-rt_debug-debuginfo
kernel-rt_debug
kernel-rt-devel-debuginfo
kernel-rt-devel
kernel-azure-base
kernel-source-azure
kernel-devel-azure
kernel-syms-azure
kernel-azure-devel
kernel-azure-debugsource
kernel-azure-debuginfo
kernel-azure-base-debuginfo
kernel-azure
kernel-default-kgraft-devel
kernel-default-devel-debuginfo
kernel-docs
kernel-obs-build-debugsource
kernel-obs-build
kernel-default-extra-debuginfo
kernel-default-extra
reiserfs-kmp-default
kernel-vanilla-debugsource
kernel-vanilla-debuginfo
kernel-vanilla-base-debuginfo
reiserfs-kmp-default-debuginfo
kernel-vanilla-base
kernel-default-livepatch
kernel-zfcpdump-debuginfo
kernel-zfcpdump-debugsource
kernel-default-livepatch-devel
kernel-azure-devel-debuginfo
kernel-preempt-debugsource
kernel-preempt-extra
kernel-preempt-extra-debuginfo
kernel-preempt-debuginfo
kernel-preempt-devel
kernel-preempt-devel-debuginfo
kernel-preempt
kernel-64kb
kernel-64kb-debuginfo
kernel-64kb-debugsource
kernel-64kb-devel
kernel-64kb-devel-debuginfo
kernel-zfcpdump

Install updates from vendor's website.

Linux kernel - update to 5.10.42
kernel-livepatch-4_12_14-150_78-default - update to 1-1.3.1
kernel-livepatch-4_12_14-150_78-default-debuginfo - update to 1-1.3.1
kernel-livepatch-4_12_14-197_102-default - update to 1-3.3.1
kgraft-patch-4_4_180-94_150-default - update to 1-4.3.1
kgraft-patch-4_4_180-94_150-default-debuginfo - update to 1-4.3.1
kernel-livepatch-SLE15-SP2_Update_22-debugsource - update to 1-5.3.1
kernel-livepatch-5_3_18-24_96-default-debuginfo - update to 1-5.3.1
kernel-livepatch-5_3_18-24_96-default - update to 1-5.3.1
kgraft-patch-4_12_14-95_83-default - update to 1-6.3.1
kernel-livepatch-5_3_18-59_37-default - update to 1-7.3.2
kernel-livepatch-5_3_18-59_37-default-debuginfo - update to 1-7.3.2
kernel-livepatch-SLE15-SP3_Update_10-debugsource - update to 1-7.3.2
kgraft-patch-4_12_14-122_103-default - update to 1-8.5.1
kernel-default-base - addressed in versions 3.0.101-108.138.1, 4.4.121-92.161.1, 4.4.180-94.150.1, 4.12.14-95.83.2, 4.12.14-122.103.1, 4.12.14-150.78.1, 4.12.14-197.102.2, 5.3.18-24.96.1.9.44.1, 5.3.18-59.37.2.18.23.3
kernel-default - addressed in versions 3.0.101-108.138.1, 4.4.121-92.161.1, 4.4.180-94.150.1, 4.12.14-95.83.2, 4.12.14-122.103.1, 4.12.14-150.78.1, 4.12.14-197.102.2, 5.3.18-24.96.1, 5.3.18-59.37.2
kernel-default-devel - addressed in versions 3.0.101-108.138.1, 4.4.121-92.161.1, 4.4.180-94.150.1, 4.12.14-95.83.2, 4.12.14-122.103.1, 4.12.14-150.78.1, 4.12.14-197.102.2, 5.3.18-24.96.1, 5.3.18-59.37.2
kernel-ec2 - update to 3.0.101-108.138.1
kernel-ec2-base - update to 3.0.101-108.138.1
kernel-trace-base - update to 3.0.101-108.138.1
kernel-trace - update to 3.0.101-108.138.1
kernel-trace-devel - update to 3.0.101-108.138.1
kernel-xen-devel - update to 3.0.101-108.138.1
kernel-xen-base - update to 3.0.101-108.138.1
kernel-ec2-devel - update to 3.0.101-108.138.1
kernel-source - addressed in versions 3.0.101-108.138.1, 4.4.121-92.161.1, 4.4.180-94.150.1, 4.12.14-95.83.2, 4.12.14-122.103.1, 4.12.14-150.78.1, 4.12.14-197.102.2, 5.3.18-24.96.1, 5.3.18-59.37.2
kernel-syms - addressed in versions 3.0.101-108.138.1, 4.4.121-92.161.1, 4.4.180-94.150.1, 4.12.14-95.83.2, 4.12.14-122.103.1, 4.12.14-150.78.1, 4.12.14-197.102.2, 5.3.18-24.96.1, 5.3.18-59.37.1
kernel-xen - update to 3.0.101-108.138.1
kernel-default-debuginfo - addressed in versions 4.4.121-92.161.1, 4.4.180-94.150.1, 4.12.14-95.83.2, 4.12.14-122.103.1, 4.12.14-150.78.1, 4.12.14-197.102.2, 5.3.18-24.96.1, 5.3.18-59.37.2
kernel-default-debugsource - addressed in versions 4.4.121-92.161.1, 4.4.180-94.150.1, 4.12.14-95.83.2, 4.12.14-122.103.1, 4.12.14-150.78.1, 4.12.14-197.102.2, 5.3.18-24.96.1, 5.3.18-59.37.2
kernel-default-base-debuginfo - addressed in versions 4.4.121-92.161.1, 4.4.180-94.150.1, 4.12.14-95.83.2, 4.12.14-122.103.1, 4.12.14-197.102.2
kernel-macros - addressed in versions 4.4.121-92.161.1, 4.4.180-94.150.1, 4.12.14-95.83.2, 4.12.14-122.103.1, 4.12.14-150.78.1, 4.12.14-197.102.2, 5.3.18-24.96.1, 5.3.18-59.37.2
kernel-devel - addressed in versions 4.4.121-92.161.1, 4.4.180-94.150.1, 4.12.14-95.83.2, 4.12.14-122.103.1, 4.12.14-150.78.1, 4.12.14-197.102.2, 5.3.18-24.96.1, 5.3.18-59.37.2
dlm-kmp-default - addressed in versions 4.4.180-94.150.1, 4.12.14-95.83.2, 4.12.14-122.103.1, 4.12.14-150.78.1, 4.12.14-197.102.2, 5.3.18-24.96.1, 5.3.18-59.37.2
dlm-kmp-default-debuginfo - addressed in versions 4.4.180-94.150.1, 4.12.14-95.83.2, 4.12.14-122.103.1, 4.12.14-150.78.1, 4.12.14-197.102.2, 5.3.18-24.96.1, 5.3.18-59.37.2
cluster-md-kmp-default-debuginfo - addressed in versions 4.4.180-94.150.1, 4.12.14-95.83.2, 4.12.14-122.103.1, 4.12.14-150.78.1, 4.12.14-197.102.2, 5.3.18-24.96.1, 5.3.18-59.37.2
cluster-md-kmp-default - addressed in versions 4.4.180-94.150.1, 4.12.14-95.83.2, 4.12.14-122.103.1, 4.12.14-150.78.1, 4.12.14-197.102.2, 5.3.18-24.96.1, 5.3.18-59.37.2
kernel-default-man - addressed in versions 4.4.180-94.150.1, 4.12.14-95.83.2, 4.12.14-122.103.1, 4.12.14-150.78.1, 4.12.14-197.102.2
kernel-default-kgraft - addressed in versions 4.4.180-94.150.1, 4.12.14-95.83.2, 4.12.14-122.103.1
gfs2-kmp-default - addressed in versions 4.4.180-94.150.1, 4.12.14-95.83.2, 4.12.14-122.103.1, 4.12.14-150.78.1, 4.12.14-197.102.2, 5.3.18-24.96.1, 5.3.18-59.37.2
gfs2-kmp-default-debuginfo - addressed in versions 4.4.180-94.150.1, 4.12.14-95.83.2, 4.12.14-122.103.1, 4.12.14-150.78.1, 4.12.14-197.102.2, 5.3.18-24.96.1, 5.3.18-59.37.2
ocfs2-kmp-default - addressed in versions 4.4.180-94.150.1, 4.12.14-95.83.2, 4.12.14-122.103.1, 4.12.14-150.78.1, 4.12.14-197.102.2, 5.3.18-24.96.1, 5.3.18-59.37.2
ocfs2-kmp-default-debuginfo - addressed in versions 4.4.180-94.150.1, 4.12.14-95.83.2, 4.12.14-122.103.1, 4.12.14-150.78.1, 4.12.14-197.102.2, 5.3.18-24.96.1, 5.3.18-59.37.2
kernel-rt-debugsource - addressed in versions 4.12.14-10.70.2, 5.3.18-62.2, 5.3.18-65.2
kernel-syms-rt - addressed in versions 4.12.14-10.70.2, 5.3.18-62.1, 5.3.18-65.1
kernel-rt-debuginfo - addressed in versions 4.12.14-10.70.2, 5.3.18-62.2, 5.3.18-65.2
kernel-rt-base-debuginfo - update to 4.12.14-10.70.2
kernel-rt-base - update to 4.12.14-10.70.2
kernel-rt - addressed in versions 4.12.14-10.70.2, 5.3.18-62.2, 5.3.18-65.2
gfs2-kmp-rt-debuginfo - addressed in versions 4.12.14-10.70.2, 5.3.18-62.2, 5.3.18-65.2
gfs2-kmp-rt - addressed in versions 4.12.14-10.70.2, 5.3.18-62.2, 5.3.18-65.2
dlm-kmp-rt-debuginfo - addressed in versions 4.12.14-10.70.2, 5.3.18-62.2, 5.3.18-65.2
dlm-kmp-rt - addressed in versions 4.12.14-10.70.2, 5.3.18-62.2, 5.3.18-65.2
cluster-md-kmp-rt-debuginfo - addressed in versions 4.12.14-10.70.2, 5.3.18-62.2, 5.3.18-65.2
cluster-md-kmp-rt - addressed in versions 4.12.14-10.70.2, 5.3.18-62.2, 5.3.18-65.2
kernel-source-rt - addressed in versions 4.12.14-10.70.2, 5.3.18-62.3, 5.3.18-65.2
kernel-devel-rt - addressed in versions 4.12.14-10.70.2, 5.3.18-62.3, 5.3.18-65.2
ocfs2-kmp-rt-debuginfo - addressed in versions 4.12.14-10.70.2, 5.3.18-62.2, 5.3.18-65.2
ocfs2-kmp-rt - addressed in versions 4.12.14-10.70.2, 5.3.18-62.2, 5.3.18-65.2
kernel-rt_debug-devel-debuginfo - addressed in versions 4.12.14-10.70.2, 5.3.18-62.3, 5.3.18-65.2
kernel-rt_debug-devel - addressed in versions 4.12.14-10.70.2, 5.3.18-62.3, 5.3.18-65.2
kernel-rt_debug-debugsource - addressed in versions 4.12.14-10.70.2, 5.3.18-62.3, 5.3.18-65.2
kernel-rt_debug-debuginfo - addressed in versions 4.12.14-10.70.2, 5.3.18-62.3, 5.3.18-65.2
kernel-rt_debug - addressed in versions 4.12.14-10.70.2, 5.3.18-62.3
kernel-rt-devel-debuginfo - addressed in versions 4.12.14-10.70.2, 5.3.18-62.2, 5.3.18-65.2
kernel-rt-devel - addressed in versions 4.12.14-10.70.2, 5.3.18-62.2, 5.3.18-65.2
kernel-azure-base - update to 4.12.14-16.80.1
kernel-source-azure - addressed in versions 4.12.14-16.80.1, 5.3.18-18.75.1, 5.3.18-38.31.1
kernel-devel-azure - addressed in versions 4.12.14-16.80.1, 5.3.18-18.75.1, 5.3.18-38.31.1
kernel-syms-azure - addressed in versions 4.12.14-16.80.1, 5.3.18-18.75.1, 5.3.18-38.31.1
kernel-azure-devel - addressed in versions 4.12.14-16.80.1, 5.3.18-18.75.1, 5.3.18-38.31.1
kernel-azure-debugsource - addressed in versions 4.12.14-16.80.1, 5.3.18-18.75.1, 5.3.18-38.31.1
kernel-azure-debuginfo - addressed in versions 4.12.14-16.80.1, 5.3.18-18.75.1, 5.3.18-38.31.1
kernel-azure-base-debuginfo - update to 4.12.14-16.80.1
kernel-azure - addressed in versions 4.12.14-16.80.1, 5.3.18-18.75.1, 5.3.18-38.31.1
kernel-default-kgraft-devel - addressed in versions 4.12.14-95.83.2, 4.12.14-122.103.1
kernel-default-devel-debuginfo - addressed in versions 4.12.14-95.83.2, 4.12.14-122.103.1, 4.12.14-150.78.1, 4.12.14-197.102.2, 5.3.18-24.96.1, 5.3.18-59.37.2
kernel-docs - addressed in versions 4.12.14-122.103.1, 4.12.14-150.78.2, 4.12.14-197.102.2, 5.3.18-24.96.1, 5.3.18-59.37.2
kernel-obs-build-debugsource - addressed in versions 4.12.14-122.103.1, 4.12.14-150.78.2, 4.12.14-197.102.1, 5.3.18-24.96.1, 5.3.18-59.37.3
kernel-obs-build - addressed in versions 4.12.14-122.103.1, 4.12.14-150.78.2, 4.12.14-197.102.1, 5.3.18-24.96.1, 5.3.18-59.37.3
kernel-default-extra-debuginfo - addressed in versions 4.12.14-122.103.1, 5.3.18-24.96.1, 5.3.18-59.37.2
kernel-default-extra - addressed in versions 4.12.14-122.103.1, 5.3.18-24.96.1, 5.3.18-59.37.2
reiserfs-kmp-default - addressed in versions 4.12.14-150.78.1, 4.12.14-197.102.2, 5.3.18-24.96.1, 5.3.18-59.37.2
kernel-vanilla-debugsource - update to 4.12.14-150.78.1
kernel-vanilla-debuginfo - update to 4.12.14-150.78.1
kernel-vanilla-base-debuginfo - update to 4.12.14-150.78.1
reiserfs-kmp-default-debuginfo - addressed in versions 4.12.14-150.78.1, 4.12.14-197.102.2, 5.3.18-24.96.1, 5.3.18-59.37.2
kernel-vanilla-base - update to 4.12.14-150.78.1
kernel-default-livepatch - addressed in versions 4.12.14-150.78.1, 4.12.14-197.102.2, 5.3.18-24.96.1, 5.3.18-59.37.2
kernel-zfcpdump-debuginfo - addressed in versions 4.12.14-150.78.1, 4.12.14-197.102.2, 5.3.18-59.37.2
kernel-zfcpdump-debugsource - addressed in versions 4.12.14-150.78.1, 4.12.14-197.102.2, 5.3.18-59.37.2
kernel-default-livepatch-devel - addressed in versions 4.12.14-197.102.2, 5.3.18-24.96.1, 5.3.18-59.37.2
kernel-azure-devel-debuginfo - addressed in versions 5.3.18-18.75.1, 5.3.18-38.31.1
kernel-preempt-debugsource - addressed in versions 5.3.18-24.96.1, 5.3.18-59.37.2
kernel-preempt-extra - addressed in versions 5.3.18-24.96.1, 5.3.18-59.37.2
kernel-preempt-extra-debuginfo - addressed in versions 5.3.18-24.96.1, 5.3.18-59.37.2
kernel-preempt-debuginfo - addressed in versions 5.3.18-24.96.1, 5.3.18-59.37.2
kernel-preempt-devel - addressed in versions 5.3.18-24.96.1, 5.3.18-59.37.2
kernel-preempt-devel-debuginfo - addressed in versions 5.3.18-24.96.1, 5.3.18-59.37.2
kernel-preempt - addressed in versions 5.3.18-24.96.1, 5.3.18-59.37.2
kernel-64kb - update to 5.3.18-59.37.2
kernel-64kb-debuginfo - update to 5.3.18-59.37.2
kernel-64kb-debugsource - update to 5.3.18-59.37.2
kernel-64kb-devel - update to 5.3.18-59.37.2
kernel-64kb-devel-debuginfo - update to 5.3.18-59.37.2
kernel-zfcpdump - update to 5.3.18-59.37.2

• https://www.zerodayinitiative.com/advisories/ZDI-21-1223/

• Privilege escalation in Linux kernel Bluetooth CMTP module
• SUSE update for the Linux Kernel
• Multiple vulnerabilities in Oracle VM Server for x86
• SUSE update for the Linux 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
• SUSE update for the Linux Kernel
• SUSE update for the Linux RT Kernel
• SUSE update for the Linux RT Kernel
• SUSE update for the Linux RT 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
• SUSE update for the Linux Kernel