Improper Verification of Cryptographic Signature in Linux kernel - CVE-2021-35039

Vulnerability identifier: #VU66477

CSH Severity: Low

CVSS v4: 8.5 [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]

CVE-ID: CVE-2021-35039

CWE-ID: CWE-347

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 improper signature handling in the kernel/module.c in Linux kernel. If the kernel module is not signed, it still can be loaded into the system via init_module if module.sig_enforce=1 command-line argument is used. As a result, a local user can load unsigned and potentially malicious kernel modules.

Linux kernel
SUSE MicroOS
Anolis OS
SUSE Linux Enterprise Module for Development Tools
SUSE Linux Enterprise Module for Public Cloud
SUSE Linux Enterprise Workstation Extension
SUSE Linux Enterprise Module for Live Patching
SUSE Linux Enterprise Module for Realtime
SUSE Linux Enterprise High Availability
SUSE Linux Enterprise Module for Basesystem
SUSE Linux Enterprise Module for Legacy Software
openEuler
kernel-livepatch-5_3_18-24_75-default-debuginfo
kernel-livepatch-5_3_18-24_75-default
kernel-livepatch-SLE15-SP2_Update_17-debugsource
kernel-livepatch-5_3_18-59_19-default
kernel-debugsource
kernel
kernel-devel
kernel-tools-debuginfo
python2-perf-debuginfo
perf-debuginfo
kernel-tools
kernel-debuginfo
kernel-tools-devel
kernel-source
bpftool-debuginfo
python3-perf
bpftool
python3-perf-debuginfo
python2-perf
perf
kernel-headers
kernel-debug-modules
kernel-debug-devel
kernel-debug-core
kernel-debug
kernel-core
kernel-debug-modules-extra
kernel-modules
kernel-modules-extra
kernel-modules-internal
kernel-tools-libs
kernel-tools-libs-devel
python-perf
kernel-devel-azure
kernel-source-azure
kernel-azure
kernel-azure-debuginfo
kernel-azure-debugsource
kernel-azure-devel
kernel-azure-devel-debuginfo
kernel-syms-azure
kernel-syms
kernel-docs
kernel-macros
kernel-preempt-extra
kernel-preempt-extra-debuginfo
kernel-default-livepatch
kernel-obs-build
kernel-default-livepatch-devel
kernel-default
kernel-default-debuginfo
kernel-preempt-devel-debuginfo
kernel-default-debugsource
kernel-default-extra
kernel-default-extra-debuginfo
cluster-md-kmp-default-debuginfo
kernel-preempt-devel
kernel-preempt-debugsource
ocfs2-kmp-default-debuginfo
ocfs2-kmp-default
gfs2-kmp-default-debuginfo
gfs2-kmp-default
dlm-kmp-default-debuginfo
dlm-kmp-default
reiserfs-kmp-default
cluster-md-kmp-default
kernel-preempt
kernel-preempt-debuginfo
kernel-default-devel-debuginfo
kernel-default-devel
kernel-obs-build-debugsource
reiserfs-kmp-default-debuginfo
kernel-default-base
kernel-syms-rt
kernel-devel-rt
dlm-kmp-rt
cluster-md-kmp-rt
kernel-source-rt
kernel-rt-debugsource
dlm-kmp-rt-debuginfo
gfs2-kmp-rt
gfs2-kmp-rt-debuginfo
kernel-rt
kernel-rt-debuginfo
kernel-rt-devel
kernel-rt-devel-debuginfo
kernel-rt_debug
kernel-rt_debug-debuginfo
kernel-rt_debug-debugsource
kernel-rt_debug-devel
kernel-rt_debug-devel-debuginfo
ocfs2-kmp-rt
ocfs2-kmp-rt-debuginfo
cluster-md-kmp-rt-debuginfo
kernel-zfcpdump-debugsource
kernel-zfcpdump-debuginfo
kernel-zfcpdump
kernel-64kb-devel-debuginfo
kernel-64kb-devel
kernel-64kb-debugsource
kernel-64kb-debuginfo
kernel-64kb
Dell EMC VxRail Appliance

Install updates from vendor's website.

Linux kernel - update to 5.12.14
kernel-livepatch-5_3_18-24_75-default-debuginfo - update to 1-5.3.3
kernel-livepatch-5_3_18-24_75-default - update to 1-5.3.3
kernel-livepatch-SLE15-SP2_Update_17-debugsource - update to 1-5.3.3
kernel-livepatch-5_3_18-59_19-default - update to 1-7.3.1
kernel-debugsource - update to 4.19.90-2107.4.0.0097
kernel - update to 4.19.90-2107.4.0.0097
kernel-devel - update to 4.19.90-2107.4.0.0097
kernel-tools-debuginfo - update to 4.19.90-2107.4.0.0097
python2-perf-debuginfo - update to 4.19.90-2107.4.0.0097
perf-debuginfo - update to 4.19.90-2107.4.0.0097
kernel-tools - update to 4.19.90-2107.4.0.0097
kernel-debuginfo - update to 4.19.90-2107.4.0.0097
kernel-tools-devel - update to 4.19.90-2107.4.0.0097
kernel-source - update to 4.19.90-2107.4.0.0097
bpftool-debuginfo - update to 4.19.90-2107.4.0.0097
python3-perf - update to 4.19.90-2107.4.0.0097
bpftool - update to 4.19.90-2107.4.0.0097
python3-perf-debuginfo - update to 4.19.90-2107.4.0.0097
python2-perf - update to 4.19.90-2107.4.0.0097
perf - update to 4.19.90-2107.4.0.0097
python3-perf - update to 4.19.91-25.6
kernel-headers - addressed in versions 4.19.91-25.6, 4.19.91-26
kernel-debug-modules - update to 4.19.91-25.6
kernel-debug-devel - addressed in versions 4.19.91-25.6, 4.19.91-26
kernel-debug-core - update to 4.19.91-25.6
kernel-debug - addressed in versions 4.19.91-25.6, 4.19.91-26
kernel-core - update to 4.19.91-25.6
kernel - addressed in versions 4.19.91-25.6, 4.19.91-26
kernel-debug-modules-extra - update to 4.19.91-25.6
kernel-devel - addressed in versions 4.19.91-25.6, 4.19.91-26
kernel-modules - update to 4.19.91-25.6
kernel-modules-extra - update to 4.19.91-25.6
kernel-modules-internal - update to 4.19.91-25.6
kernel-tools - addressed in versions 4.19.91-25.6, 4.19.91-26
kernel-tools-libs - addressed in versions 4.19.91-25.6, 4.19.91-26
kernel-tools-libs-devel - addressed in versions 4.19.91-25.6, 4.19.91-26
perf - addressed in versions 4.19.91-25.6, 4.19.91-26
bpftool - addressed in versions 4.19.91-25.6, 4.19.91-26
python-perf - update to 4.19.91-26
kernel-devel-azure - addressed in versions 5.3.18-18.58.1, 5.3.18-38.17.1
kernel-source-azure - addressed in versions 5.3.18-18.58.1, 5.3.18-38.17.1
kernel-azure - addressed in versions 5.3.18-18.58.1, 5.3.18-38.17.1
kernel-azure-debuginfo - addressed in versions 5.3.18-18.58.1, 5.3.18-38.17.1
kernel-azure-debugsource - addressed in versions 5.3.18-18.58.1, 5.3.18-38.17.1
kernel-azure-devel - addressed in versions 5.3.18-18.58.1, 5.3.18-38.17.1
kernel-azure-devel-debuginfo - addressed in versions 5.3.18-18.58.1, 5.3.18-38.17.1
kernel-syms-azure - addressed in versions 5.3.18-18.58.1, 5.3.18-38.17.1
kernel-syms - addressed in versions 5.3.18-24.75.1, 5.3.18-59.19.1
kernel-source - addressed in versions 5.3.18-24.75.2, 5.3.18-59.19.1
kernel-docs - addressed in versions 5.3.18-24.75.2, 5.3.18-59.19.1
kernel-macros - addressed in versions 5.3.18-24.75.2, 5.3.18-59.19.1
kernel-devel - addressed in versions 5.3.18-24.75.2, 5.3.18-59.19.1
kernel-preempt-extra - addressed in versions 5.3.18-24.75.3, 5.3.18-59.19.1
kernel-preempt-extra-debuginfo - addressed in versions 5.3.18-24.75.3, 5.3.18-59.19.1
kernel-default-livepatch - addressed in versions 5.3.18-24.75.3, 5.3.18-59.19.1
kernel-obs-build - addressed in versions 5.3.18-24.75.3, 5.3.18-59.19.1
kernel-default-livepatch-devel - addressed in versions 5.3.18-24.75.3, 5.3.18-59.19.1
kernel-default - addressed in versions 5.3.18-24.75.3, 5.3.18-59.19.1
kernel-default-debuginfo - addressed in versions 5.3.18-24.75.3, 5.3.18-59.19.1
kernel-preempt-devel-debuginfo - addressed in versions 5.3.18-24.75.3, 5.3.18-59.19.1
kernel-default-debugsource - addressed in versions 5.3.18-24.75.3, 5.3.18-59.19.1
kernel-default-extra - addressed in versions 5.3.18-24.75.3, 5.3.18-59.19.1
kernel-default-extra-debuginfo - addressed in versions 5.3.18-24.75.3, 5.3.18-59.19.1
cluster-md-kmp-default-debuginfo - addressed in versions 5.3.18-24.75.3, 5.3.18-59.19.1
kernel-preempt-devel - addressed in versions 5.3.18-24.75.3, 5.3.18-59.19.1
kernel-preempt-debugsource - addressed in versions 5.3.18-24.75.3, 5.3.18-59.19.1
ocfs2-kmp-default-debuginfo - addressed in versions 5.3.18-24.75.3, 5.3.18-59.19.1
ocfs2-kmp-default - addressed in versions 5.3.18-24.75.3, 5.3.18-59.19.1
gfs2-kmp-default-debuginfo - addressed in versions 5.3.18-24.75.3, 5.3.18-59.19.1
gfs2-kmp-default - addressed in versions 5.3.18-24.75.3, 5.3.18-59.19.1
dlm-kmp-default-debuginfo - addressed in versions 5.3.18-24.75.3, 5.3.18-59.19.1
dlm-kmp-default - addressed in versions 5.3.18-24.75.3, 5.3.18-59.19.1
reiserfs-kmp-default - addressed in versions 5.3.18-24.75.3, 5.3.18-59.19.1
cluster-md-kmp-default - addressed in versions 5.3.18-24.75.3, 5.3.18-59.19.1
kernel-preempt - addressed in versions 5.3.18-24.75.3, 5.3.18-59.19.1
kernel-preempt-debuginfo - addressed in versions 5.3.18-24.75.3, 5.3.18-59.19.1
kernel-default-devel-debuginfo - addressed in versions 5.3.18-24.75.3, 5.3.18-59.19.1
kernel-default-devel - addressed in versions 5.3.18-24.75.3, 5.3.18-59.19.1
kernel-obs-build-debugsource - addressed in versions 5.3.18-24.75.3, 5.3.18-59.19.1
reiserfs-kmp-default-debuginfo - addressed in versions 5.3.18-24.75.3, 5.3.18-59.19.1
kernel-default-base - addressed in versions 5.3.18-24.75.3.9.34.3, 5.3.18-59.19.1.18.10.1
kernel-syms-rt - update to 5.3.18-45.2
kernel-devel-rt - update to 5.3.18-45.3
dlm-kmp-rt - update to 5.3.18-45.3
cluster-md-kmp-rt - update to 5.3.18-45.3
kernel-source-rt - update to 5.3.18-45.3
kernel-rt-debugsource - update to 5.3.18-45.3
dlm-kmp-rt-debuginfo - update to 5.3.18-45.3
gfs2-kmp-rt - update to 5.3.18-45.3
gfs2-kmp-rt-debuginfo - update to 5.3.18-45.3
kernel-rt - update to 5.3.18-45.3
kernel-rt-debuginfo - update to 5.3.18-45.3
kernel-rt-devel - update to 5.3.18-45.3
kernel-rt-devel-debuginfo - update to 5.3.18-45.3
kernel-rt_debug - update to 5.3.18-45.3
kernel-rt_debug-debuginfo - update to 5.3.18-45.3
kernel-rt_debug-debugsource - update to 5.3.18-45.3
kernel-rt_debug-devel - update to 5.3.18-45.3
kernel-rt_debug-devel-debuginfo - update to 5.3.18-45.3
ocfs2-kmp-rt - update to 5.3.18-45.3
ocfs2-kmp-rt-debuginfo - update to 5.3.18-45.3
cluster-md-kmp-rt-debuginfo - update to 5.3.18-45.3
kernel-zfcpdump-debugsource - update to 5.3.18-59.19.1
kernel-zfcpdump-debuginfo - update to 5.3.18-59.19.1
kernel-zfcpdump - update to 5.3.18-59.19.1
kernel-64kb-devel-debuginfo - update to 5.3.18-59.19.1
kernel-64kb-devel - update to 5.3.18-59.19.1
kernel-64kb-debugsource - update to 5.3.18-59.19.1
kernel-64kb-debuginfo - update to 5.3.18-59.19.1
kernel-64kb - update to 5.3.18-59.19.1
Dell EMC VxRail Appliance - update to 7.0.203

• https://www.openwall.com/lists/oss-security/2021/07/06/3
• https://github.com/torvalds/linux/commit/0c18f29aae7ce3dadd26d8ee3505d07cc982df75
• https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.12.14
• http://www.openwall.com/lists/oss-security/2021/07/06/3
• https://security.netapp.com/advisory/ntap-20210813-0004/
• https://lists.debian.org/debian-lts-announce/2021/10/msg00010.html
• https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=0c18f29aae7ce3dadd26d8ee3505d07cc982df75

• Privilege escalation in Linux kernel
• Multiple vulnerabilities in Dell EMC VxRail Appliance
• 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
• openEuler update for kernel
• Anolis OS update for kernel(ANCK)4.19
• Anolis OS update for kernel