Type Confusion in Linux kernel - CVE-2021-34866

Vulnerability identifier: #VU57372

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-2021-34866

CWE-ID: CWE-843

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 type confusion error within the handling of eBPF programs. A local user can run a specially crafted program on the system to trigger a type confusion and execute arbitrary code with kernel privileges.

Linux kernel
SUSE MicroOS
Red Hat CodeReady Linux Builder for Power, little endian - Extended Update Support
Red Hat CodeReady Linux Builder for x86_64 - Extended Update Support
Red Hat Enterprise Linux for ARM 64 - Extended Update Support
Red Hat Enterprise Linux Server - TUS
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux for x86_64 - Extended Update Support
SUSE Linux Enterprise Workstation Extension
SUSE Linux Enterprise High Availability
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 Module for Realtime
SUSE Linux Enterprise Module for Public Cloud
Red Hat OpenShift Container Platform
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
kernel-livepatch-5_3_18-59_30-default
kernel-livepatch-5_3_18-59_34-default
kernel-livepatch-5_3_18-59_24-default
kernel-livepatch-5_3_18-59_24-default-debuginfo
kernel-livepatch-SLE15-SP3_Update_6-debugsource
kernel-livepatch-SLE15-SP3_Update_5-debugsource
kernel-livepatch-5_3_18-59_19-default-debuginfo
kernel-livepatch-5_3_18-59_19-default
kernel (Red Hat package)
kernel-livepatch-5_3_18-59_16-default
kernel-livepatch-SLE15-SP3_Update_4-debugsource
kernel-livepatch-5_3_18-59_16-default-debuginfo
kernel-syms-azure
kernel-azure-debugsource
kernel-azure-debuginfo
kernel-azure
kernel-source-azure
kernel-devel-azure
kernel-azure-devel
kernel-azure-devel-debuginfo
kernel-default
kernel-default-extra
kernel-default-debugsource
kernel-default-debuginfo
kernel-default-devel-debuginfo
kernel-preempt-devel
kernel-preempt-devel-debuginfo
kernel-docs
kernel-source
kernel-default-devel
kernel-zfcpdump-debuginfo
kernel-default-extra-debuginfo
kernel-preempt-debuginfo
kernel-preempt-debugsource
kernel-preempt-extra
kernel-preempt-extra-debuginfo
kernel-default-livepatch
kernel-default-livepatch-devel
reiserfs-kmp-default
reiserfs-kmp-default-debuginfo
kernel-obs-build
kernel-obs-build-debugsource
kernel-syms
kernel-64kb
ocfs2-kmp-default-debuginfo
ocfs2-kmp-default
gfs2-kmp-default-debuginfo
gfs2-kmp-default
dlm-kmp-default-debuginfo
dlm-kmp-default
cluster-md-kmp-default-debuginfo
cluster-md-kmp-default
kernel-zfcpdump-debugsource
kernel-zfcpdump
kernel-macros
kernel-devel
kernel-64kb-devel-debuginfo
kernel-64kb-devel
kernel-64kb-debugsource
kernel-64kb-debuginfo
kernel-preempt
kernel-default-base
dlm-kmp-rt-debuginfo
kernel-rt
kernel-rt-debuginfo
kernel-rt-debugsource
cluster-md-kmp-rt
cluster-md-kmp-rt-debuginfo
dlm-kmp-rt
gfs2-kmp-rt
gfs2-kmp-rt-debuginfo
kernel-rt-devel
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
kernel-devel-rt
kernel-source-rt
kernel-rt-devel-debuginfo
kernel-livepatch-5_3_18-59_13-default
kernel-livepatch-5_3_18-59_13-default-debuginfo
kernel-livepatch-SLE15-SP3_Update_3-debugsource
kernel-livepatch-5_3_18-59_10-default
kernel-livepatch-5_3_18-59_10-default-debuginfo
kernel-livepatch-5_3_18-59_5-default
kernel-livepatch-5_3_18-59_5-default-debuginfo
kernel-livepatch-SLE15-SP3_Update_1-debugsource
kernel-livepatch-SLE15-SP3_Update_2-debugsource
kernel-livepatch-SLE15-SP3_Update_0-debugsource
kernel-livepatch-5_3_18-57-default-debuginfo
kernel-livepatch-5_3_18-57-default

Install updates from vendor's website.

Linux kernel - update to 5.13.14
Red Hat OpenShift Container Platform - update to 4.13.33
kernel-livepatch-5_3_18-59_30-default - update to 1-7.3.1
kernel-livepatch-5_3_18-59_34-default - update to 1-7.3.1
kernel-livepatch-5_3_18-59_24-default - update to 2-2.2
kernel-livepatch-5_3_18-59_24-default-debuginfo - update to 2-2.2
kernel-livepatch-SLE15-SP3_Update_6-debugsource - update to 2-2.2
kernel-livepatch-SLE15-SP3_Update_5-debugsource - update to 4-2.2
kernel-livepatch-5_3_18-59_19-default-debuginfo - update to 4-2.2
kernel-livepatch-5_3_18-59_19-default - update to 4-2.2
kernel (Red Hat package) - update to 4.18.0-372.91.1.el8_6
kernel-livepatch-5_3_18-59_16-default - update to 5-2.2
kernel-livepatch-SLE15-SP3_Update_4-debugsource - update to 5-2.2
kernel-livepatch-5_3_18-59_16-default-debuginfo - update to 5-2.2
kernel-syms-azure - update to 5.3.18-38.28.1
kernel-azure-debugsource - update to 5.3.18-38.28.2
kernel-azure-debuginfo - update to 5.3.18-38.28.2
kernel-azure - update to 5.3.18-38.28.2
kernel-source-azure - update to 5.3.18-38.28.2
kernel-devel-azure - update to 5.3.18-38.28.2
kernel-azure-devel - update to 5.3.18-38.28.2
kernel-azure-devel-debuginfo - update to 5.3.18-38.28.2
kernel-default - addressed in versions 5.3.18-59.30.1, 5.3.18-59.34.1
kernel-default-extra - addressed in versions 5.3.18-59.30.1, 5.3.18-59.34.1
kernel-default-debugsource - addressed in versions 5.3.18-59.30.1, 5.3.18-59.34.1
kernel-default-debuginfo - addressed in versions 5.3.18-59.30.1, 5.3.18-59.34.1
kernel-default-devel-debuginfo - addressed in versions 5.3.18-59.30.1, 5.3.18-59.34.1
kernel-preempt-devel - addressed in versions 5.3.18-59.30.1, 5.3.18-59.34.1
kernel-preempt-devel-debuginfo - addressed in versions 5.3.18-59.30.1, 5.3.18-59.34.1
kernel-docs - addressed in versions 5.3.18-59.30.1, 5.3.18-59.34.1
kernel-source - addressed in versions 5.3.18-59.30.1, 5.3.18-59.34.1
kernel-default-devel - addressed in versions 5.3.18-59.30.1, 5.3.18-59.34.1
kernel-zfcpdump-debuginfo - addressed in versions 5.3.18-59.30.1, 5.3.18-59.34.1
kernel-default-extra-debuginfo - addressed in versions 5.3.18-59.30.1, 5.3.18-59.34.1
kernel-preempt-debuginfo - addressed in versions 5.3.18-59.30.1, 5.3.18-59.34.1
kernel-preempt-debugsource - addressed in versions 5.3.18-59.30.1, 5.3.18-59.34.1
kernel-preempt-extra - addressed in versions 5.3.18-59.30.1, 5.3.18-59.34.1
kernel-preempt-extra-debuginfo - addressed in versions 5.3.18-59.30.1, 5.3.18-59.34.1
kernel-default-livepatch - addressed in versions 5.3.18-59.30.1, 5.3.18-59.34.1
kernel-default-livepatch-devel - addressed in versions 5.3.18-59.30.1, 5.3.18-59.34.1
reiserfs-kmp-default - addressed in versions 5.3.18-59.30.1, 5.3.18-59.34.1
reiserfs-kmp-default-debuginfo - addressed in versions 5.3.18-59.30.1, 5.3.18-59.34.1
kernel-obs-build - addressed in versions 5.3.18-59.30.1, 5.3.18-59.34.1
kernel-obs-build-debugsource - addressed in versions 5.3.18-59.30.1, 5.3.18-59.34.1
kernel-syms - addressed in versions 5.3.18-59.30.1, 5.3.18-59.34.1
kernel-64kb - addressed in versions 5.3.18-59.30.1, 5.3.18-59.34.1
ocfs2-kmp-default-debuginfo - addressed in versions 5.3.18-59.30.1, 5.3.18-59.34.1
ocfs2-kmp-default - addressed in versions 5.3.18-59.30.1, 5.3.18-59.34.1
gfs2-kmp-default-debuginfo - addressed in versions 5.3.18-59.30.1, 5.3.18-59.34.1
gfs2-kmp-default - addressed in versions 5.3.18-59.30.1, 5.3.18-59.34.1
dlm-kmp-default-debuginfo - addressed in versions 5.3.18-59.30.1, 5.3.18-59.34.1
dlm-kmp-default - addressed in versions 5.3.18-59.30.1, 5.3.18-59.34.1
cluster-md-kmp-default-debuginfo - addressed in versions 5.3.18-59.30.1, 5.3.18-59.34.1
cluster-md-kmp-default - addressed in versions 5.3.18-59.30.1, 5.3.18-59.34.1
kernel-zfcpdump-debugsource - addressed in versions 5.3.18-59.30.1, 5.3.18-59.34.1
kernel-zfcpdump - addressed in versions 5.3.18-59.30.1, 5.3.18-59.34.1
kernel-macros - addressed in versions 5.3.18-59.30.1, 5.3.18-59.34.1
kernel-devel - addressed in versions 5.3.18-59.30.1, 5.3.18-59.34.1
kernel-64kb-devel-debuginfo - addressed in versions 5.3.18-59.30.1, 5.3.18-59.34.1
kernel-64kb-devel - addressed in versions 5.3.18-59.30.1, 5.3.18-59.34.1
kernel-64kb-debugsource - addressed in versions 5.3.18-59.30.1, 5.3.18-59.34.1
kernel-64kb-debuginfo - addressed in versions 5.3.18-59.30.1, 5.3.18-59.34.1
kernel-preempt - addressed in versions 5.3.18-59.30.1, 5.3.18-59.34.1
kernel-default-base - addressed in versions 5.3.18-59.30.1.18.17.1, 5.3.18-59.34.1.18.21.1
dlm-kmp-rt-debuginfo - update to 5.3.18-60.1
kernel-rt - update to 5.3.18-60.1
kernel-rt-debuginfo - update to 5.3.18-60.1
kernel-rt-debugsource - update to 5.3.18-60.1
cluster-md-kmp-rt - update to 5.3.18-60.1
cluster-md-kmp-rt-debuginfo - update to 5.3.18-60.1
dlm-kmp-rt - update to 5.3.18-60.1
gfs2-kmp-rt - update to 5.3.18-60.1
gfs2-kmp-rt-debuginfo - update to 5.3.18-60.1
kernel-rt-devel - update to 5.3.18-60.1
kernel-rt_debug-debuginfo - update to 5.3.18-60.1
kernel-rt_debug-debugsource - update to 5.3.18-60.1
kernel-rt_debug-devel - update to 5.3.18-60.1
kernel-rt_debug-devel-debuginfo - update to 5.3.18-60.1
kernel-syms-rt - update to 5.3.18-60.1
ocfs2-kmp-rt - update to 5.3.18-60.1
ocfs2-kmp-rt-debuginfo - update to 5.3.18-60.1
kernel-devel-rt - update to 5.3.18-60.1
kernel-source-rt - update to 5.3.18-60.1
kernel-rt-devel-debuginfo - update to 5.3.18-60.1
kernel-livepatch-5_3_18-59_13-default - update to 6-2.2
kernel-livepatch-5_3_18-59_13-default-debuginfo - update to 6-2.2
kernel-livepatch-SLE15-SP3_Update_3-debugsource - update to 6-2.2
kernel-livepatch-5_3_18-59_10-default - update to 6-2.2
kernel-livepatch-5_3_18-59_10-default-debuginfo - update to 6-2.2
kernel-livepatch-5_3_18-59_5-default - update to 6-2.2
kernel-livepatch-5_3_18-59_5-default-debuginfo - update to 6-2.2
kernel-livepatch-SLE15-SP3_Update_1-debugsource - update to 6-2.2
kernel-livepatch-SLE15-SP3_Update_2-debugsource - update to 6-2.2
kernel-livepatch-SLE15-SP3_Update_0-debugsource - update to 8-3.2
kernel-livepatch-5_3_18-57-default-debuginfo - update to 8-3.2
kernel-livepatch-5_3_18-57-default - update to 8-3.2

• https://www.zerodayinitiative.com/advisories/ZDI-21-1148/

• Privilege escalation in Linux Kernel eBPF
• SUSE update for the Linux Kernel (Live Patch 3 for SLE 15 SP3)
• SUSE update for the Linux Kernel (Live Patch 0 for SLE 15 SP3)
• SUSE update for the Linux Kernel (Live Patch 5 for SLE 15 SP3)
• Red Hat Enterprise Linux 8.6 Extended Update Support update for kernel
• Multiple vulnerabilities in Red Hat OpenShift Container Platform 4.13
• SUSE update for the Linux Kernel
• SUSE update for the Linux Kernel
• SUSE update for the Linux Kernel
• SUSE update for the Linux Kernel