Observable discrepancy in Linux kernel - CVE-2021-38209

Vulnerability identifier: #VU92753

CSH Severity: Low

CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2021-38209

CWE-ID: CWE-203

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to gain access to sensitive information.

net/netfilter/nf_conntrack_standalone.c in the Linux kernel before 5.12.2 allows observation of changes in any net namespace because these changes are leaked into all other net namespaces. This is related to the NF_SYSCTL_CT_MAX, NF_SYSCTL_CT_EXPECT_MAX, and NF_SYSCTL_CT_BUCKETS sysctls.

Linux kernel
SUSE MicroOS
SUSE Linux Enterprise Module for Public Cloud
SUSE Linux Enterprise Workstation Extension
SUSE Linux Enterprise Module for Live Patching
SUSE Linux Enterprise Module for Legacy Software
SUSE Linux Enterprise Module for Development Tools
SUSE Linux Enterprise Module for Basesystem
SUSE Linux Enterprise High Availability
openEuler
kernel-livepatch-SLE15-SP3_Update_6-debugsource
kernel-livepatch-5_3_18-59_24-default-debuginfo
kernel-livepatch-5_3_18-59_24-default
bpftool-debuginfo
kernel
kernel-debugsource
perf
python3-perf-debuginfo
kernel-source
kernel-tools-debuginfo
python2-perf
python3-perf
kernel-tools-devel
kernel-tools
python2-perf-debuginfo
kernel-debuginfo
kernel-devel
perf-debuginfo
bpftool
kernel-source-azure
kernel-devel-azure
kernel-syms-azure
kernel-azure-debuginfo
kernel-azure
kernel-azure-debugsource
kernel-azure-devel
kernel-azure-devel-debuginfo
kernel-obs-build
dlm-kmp-default-debuginfo
gfs2-kmp-default
gfs2-kmp-default-debuginfo
ocfs2-kmp-default
ocfs2-kmp-default-debuginfo
kernel-default
kernel-default-debuginfo
kernel-default-debugsource
reiserfs-kmp-default-debuginfo
reiserfs-kmp-default
kernel-default-livepatch-devel
kernel-default-livepatch
kernel-preempt-extra-debuginfo
kernel-preempt-extra
kernel-preempt-debugsource
kernel-preempt-debuginfo
kernel-default-extra-debuginfo
kernel-default-extra
kernel-64kb-debuginfo
kernel-obs-build-debugsource
kernel-syms
kernel-preempt-devel
kernel-preempt-devel-debuginfo
kernel-docs
kernel-default-devel
kernel-default-devel-debuginfo
kernel-preempt
kernel-64kb
dlm-kmp-default
kernel-64kb-debugsource
kernel-64kb-devel
kernel-64kb-devel-debuginfo
kernel-macros
kernel-zfcpdump
kernel-zfcpdump-debuginfo
kernel-zfcpdump-debugsource
cluster-md-kmp-default
cluster-md-kmp-default-debuginfo
kernel-default-base

Install update from vendor's repository.

kernel-livepatch-SLE15-SP3_Update_6-debugsource - update to 1-7.5.1
kernel-livepatch-5_3_18-59_24-default-debuginfo - update to 1-7.5.1
kernel-livepatch-5_3_18-59_24-default - update to 1-7.5.1
bpftool-debuginfo - update to 4.19.90-2108.5.0.0103
kernel - update to 4.19.90-2108.5.0.0103
kernel-debugsource - update to 4.19.90-2108.5.0.0103
perf - update to 4.19.90-2108.5.0.0103
python3-perf-debuginfo - update to 4.19.90-2108.5.0.0103
kernel-source - update to 4.19.90-2108.5.0.0103
kernel-tools-debuginfo - update to 4.19.90-2108.5.0.0103
python2-perf - update to 4.19.90-2108.5.0.0103
python3-perf - update to 4.19.90-2108.5.0.0103
kernel-tools-devel - update to 4.19.90-2108.5.0.0103
kernel-tools - update to 4.19.90-2108.5.0.0103
python2-perf-debuginfo - update to 4.19.90-2108.5.0.0103
kernel-debuginfo - update to 4.19.90-2108.5.0.0103
kernel-devel - update to 4.19.90-2108.5.0.0103
perf-debuginfo - update to 4.19.90-2108.5.0.0103
bpftool - update to 4.19.90-2108.5.0.0103
kernel-source-azure - update to 5.3.18-38.22.1
kernel-devel-azure - update to 5.3.18-38.22.1
kernel-syms-azure - update to 5.3.18-38.22.1
kernel-azure-debuginfo - update to 5.3.18-38.22.2
kernel-azure - update to 5.3.18-38.22.2
kernel-azure-debugsource - update to 5.3.18-38.22.2
kernel-azure-devel - update to 5.3.18-38.22.2
kernel-azure-devel-debuginfo - update to 5.3.18-38.22.2
kernel-obs-build - update to 5.3.18-59.24.1
dlm-kmp-default-debuginfo - update to 5.3.18-59.24.1
gfs2-kmp-default - update to 5.3.18-59.24.1
gfs2-kmp-default-debuginfo - update to 5.3.18-59.24.1
ocfs2-kmp-default - update to 5.3.18-59.24.1
ocfs2-kmp-default-debuginfo - update to 5.3.18-59.24.1
kernel-default - update to 5.3.18-59.24.1
kernel-default-debuginfo - update to 5.3.18-59.24.1
kernel-default-debugsource - update to 5.3.18-59.24.1
reiserfs-kmp-default-debuginfo - update to 5.3.18-59.24.1
reiserfs-kmp-default - update to 5.3.18-59.24.1
kernel-default-livepatch-devel - update to 5.3.18-59.24.1
kernel-default-livepatch - update to 5.3.18-59.24.1
kernel-preempt-extra-debuginfo - update to 5.3.18-59.24.1
kernel-preempt-extra - update to 5.3.18-59.24.1
kernel-preempt-debugsource - update to 5.3.18-59.24.1
kernel-preempt-debuginfo - update to 5.3.18-59.24.1
kernel-default-extra-debuginfo - update to 5.3.18-59.24.1
kernel-default-extra - update to 5.3.18-59.24.1
kernel-64kb-debuginfo - update to 5.3.18-59.24.1
kernel-obs-build-debugsource - update to 5.3.18-59.24.1
kernel-syms - update to 5.3.18-59.24.1
kernel-preempt-devel - update to 5.3.18-59.24.1
kernel-preempt-devel-debuginfo - update to 5.3.18-59.24.1
kernel-docs - update to 5.3.18-59.24.1
kernel-source - update to 5.3.18-59.24.1
kernel-default-devel - update to 5.3.18-59.24.1
kernel-default-devel-debuginfo - update to 5.3.18-59.24.1
kernel-preempt - update to 5.3.18-59.24.1
kernel-64kb - update to 5.3.18-59.24.1
dlm-kmp-default - update to 5.3.18-59.24.1
kernel-64kb-debugsource - update to 5.3.18-59.24.1
kernel-64kb-devel - update to 5.3.18-59.24.1
kernel-64kb-devel-debuginfo - update to 5.3.18-59.24.1
kernel-devel - update to 5.3.18-59.24.1
kernel-macros - update to 5.3.18-59.24.1
kernel-zfcpdump - update to 5.3.18-59.24.1
kernel-zfcpdump-debuginfo - update to 5.3.18-59.24.1
kernel-zfcpdump-debugsource - update to 5.3.18-59.24.1
cluster-md-kmp-default - update to 5.3.18-59.24.1
cluster-md-kmp-default-debuginfo - update to 5.3.18-59.24.1
kernel-default-base - update to 5.3.18-59.24.1.18.12.1

• https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.12.2
• https://github.com/torvalds/linux/commit/2671fa4dc0109d3fb581bc3078fdf17b5d9080f6

• Observable discrepancy in Linux kernel
• SUSE update for the Linux Kernel
• SUSE update for the Linux Kernel
• SUSE update for the Linux Kernel
• openEuler update for kernel