Out-of-bounds read in Linux kernel - CVE-2021-3489

Vulnerability identifier: #VU90367

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-2021-3489

CWE-ID: CWE-125

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to execute arbitrary code.

The vulnerability exists due to an out-of-bounds read error within the __bpf_ringbuf_reserve() function in kernel/bpf/ringbuf.c. A local user can execute arbitrary code.

Linux kernel
Red Hat Enterprise Linux for Real Time for NFV
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for ARM 64
Red Hat CodeReady Linux Builder for x86_64
Red Hat CodeReady Linux Builder for Power, little endian
Red Hat CodeReady Linux Builder for ARM 64
Red Hat Enterprise Linux for Real Time
SUSE Linux Enterprise Module for Legacy Software
SUSE Linux Enterprise Module for Live Patching
SUSE Linux Enterprise High Availability
SUSE Linux Enterprise Module for Basesystem
SUSE Linux Enterprise Module for Development Tools
SUSE Linux Enterprise Workstation Extension
SUSE Linux Enterprise Module for Public Cloud
Ubuntu
Fedora
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-5_3_18-57-default
kernel-livepatch-5_3_18-57-default-debuginfo
kernel-livepatch-SLE15-SP3_Update_0-debugsource
kernel (Red Hat package)
kernel-rt (Red Hat package)
kernel-syms-azure
kernel-devel-azure
kernel-source-azure
kernel-azure-devel-debuginfo
kernel-azure-devel
kernel-azure-debugsource
kernel-azure-debuginfo
kernel-azure
kernel-obs-build-debugsource
kernel-obs-build
kernel-syms
kernel-devel
kernel-64kb-devel-debuginfo
kernel-64kb-devel
kernel-64kb-debugsource
kernel-macros
kernel-zfcpdump
kernel-64kb-debuginfo
gfs2-kmp-default-debuginfo
kernel-64kb
kernel-zfcpdump-debuginfo
kernel-zfcpdump-debugsource
cluster-md-kmp-default
cluster-md-kmp-default-debuginfo
dlm-kmp-default
dlm-kmp-default-debuginfo
gfs2-kmp-default
ocfs2-kmp-default
ocfs2-kmp-default-debuginfo
kernel-default-livepatch
kernel-default-debuginfo
kernel-default-debugsource
kernel-default-extra
kernel-default-extra-debuginfo
kernel-preempt-debuginfo
kernel-preempt-debugsource
kernel-preempt
kernel-preempt-extra
kernel-preempt-extra-debuginfo
kernel-default-livepatch-devel
reiserfs-kmp-default
reiserfs-kmp-default-debuginfo
kernel-preempt-devel
kernel-preempt-devel-debuginfo
kernel-docs
kernel-source
kernel-default
kernel-default-devel
kernel-default-devel-debuginfo
kernel-default-base
linux-image-oem-20.04 (Ubuntu package)
linux-image-virtual (Ubuntu package)
linux-image-generic (Ubuntu package)
linux-image-generic-64k (Ubuntu package)
linux-image-generic-lpae (Ubuntu package)
linux-image-lowlatency (Ubuntu package)
linux-image-5.8.0-53-generic (Ubuntu package)
linux-image-5.8.0-53-lowlatency (Ubuntu package)
linux-image-5.8.0-53-generic-lpae (Ubuntu package)
linux-image-5.8.0-53-generic-64k (Ubuntu package)
linux-image-virtual-hwe-20.04 (Ubuntu package)
linux-image-generic-64k-hwe-20.04 (Ubuntu package)
linux-image-generic-hwe-20.04 (Ubuntu package)
linux-image-generic-lpae-hwe-20.04 (Ubuntu package)
linux-image-lowlatency-hwe-20.04 (Ubuntu package)
linux-image-5.8.0-1024-raspi-nolpae (Ubuntu package)
linux-image-5.8.0-1024-raspi (Ubuntu package)
linux-image-raspi (Ubuntu package)
linux-image-raspi-nolpae (Ubuntu package)
linux-image-kvm (Ubuntu package)
linux-image-5.8.0-1027-kvm (Ubuntu package)
linux-image-oracle (Ubuntu package)
linux-image-5.8.0-1029-oracle (Ubuntu package)
linux-image-gke (Ubuntu package)
linux-image-gcp (Ubuntu package)
linux-image-5.8.0-1031-gcp (Ubuntu package)
linux-image-azure (Ubuntu package)
linux-image-5.8.0-1032-azure (Ubuntu package)
linux-image-5.8.0-1033-aws (Ubuntu package)
linux-image-aws (Ubuntu package)
linux-image-oem-20.04b (Ubuntu package)
linux-image-5.10.0-1026-oem (Ubuntu package)
linux-image-5.11.0-17-generic (Ubuntu package)
linux-image-5.11.0-17-generic-64k (Ubuntu package)
linux-image-5.11.0-17-generic-lpae (Ubuntu package)
linux-image-5.11.0-17-lowlatency (Ubuntu package)
linux-image-5.11.0-1005-azure (Ubuntu package)
linux-image-5.11.0-1006-oracle (Ubuntu package)
linux-image-5.11.0-1007-gcp (Ubuntu package)
linux-image-5.11.0-1007-aws (Ubuntu package)
linux-image-5.11.0-1007-kvm (Ubuntu package)
linux-image-5.11.0-1008-raspi (Ubuntu package)
linux-image-5.11.0-1008-raspi-nolpae (Ubuntu package)
kernel
kernel-headers
kernel-tools

Install update from vendor's website.

kernel-livepatch-5_3_18-59_5-default - update to 1-7.5.1
kernel-livepatch-5_3_18-59_5-default-debuginfo - update to 1-7.5.1
kernel-livepatch-SLE15-SP3_Update_1-debugsource - update to 1-7.5.1
kernel-livepatch-5_3_18-57-default - update to 2-3.1
kernel-livepatch-5_3_18-57-default-debuginfo - update to 2-3.1
kernel-livepatch-SLE15-SP3_Update_0-debugsource - update to 2-3.1
kernel (Red Hat package) - update to 4.18.0-348.el8
kernel-rt (Red Hat package) - update to 4.18.0-348.rt7.130.el8
kernel-syms-azure - update to 5.3.18-38.3.1
kernel-devel-azure - update to 5.3.18-38.3.1
kernel-source-azure - update to 5.3.18-38.3.1
kernel-azure-devel-debuginfo - update to 5.3.18-38.3.1
kernel-azure-devel - update to 5.3.18-38.3.1
kernel-azure-debugsource - update to 5.3.18-38.3.1
kernel-azure-debuginfo - update to 5.3.18-38.3.1
kernel-azure - update to 5.3.18-38.3.1
kernel-obs-build-debugsource - update to 5.3.18-59.5.1
kernel-obs-build - update to 5.3.18-59.5.1
kernel-syms - update to 5.3.18-59.5.1
kernel-devel - update to 5.3.18-59.5.2
kernel-64kb-devel-debuginfo - update to 5.3.18-59.5.2
kernel-64kb-devel - update to 5.3.18-59.5.2
kernel-64kb-debugsource - update to 5.3.18-59.5.2
kernel-macros - update to 5.3.18-59.5.2
kernel-zfcpdump - update to 5.3.18-59.5.2
kernel-64kb-debuginfo - update to 5.3.18-59.5.2
gfs2-kmp-default-debuginfo - update to 5.3.18-59.5.2
kernel-64kb - update to 5.3.18-59.5.2
kernel-zfcpdump-debuginfo - update to 5.3.18-59.5.2
kernel-zfcpdump-debugsource - update to 5.3.18-59.5.2
cluster-md-kmp-default - update to 5.3.18-59.5.2
cluster-md-kmp-default-debuginfo - update to 5.3.18-59.5.2
dlm-kmp-default - update to 5.3.18-59.5.2
dlm-kmp-default-debuginfo - update to 5.3.18-59.5.2
gfs2-kmp-default - update to 5.3.18-59.5.2
ocfs2-kmp-default - update to 5.3.18-59.5.2
ocfs2-kmp-default-debuginfo - update to 5.3.18-59.5.2
kernel-default-livepatch - update to 5.3.18-59.5.2
kernel-default-debuginfo - update to 5.3.18-59.5.2
kernel-default-debugsource - update to 5.3.18-59.5.2
kernel-default-extra - update to 5.3.18-59.5.2
kernel-default-extra-debuginfo - update to 5.3.18-59.5.2
kernel-preempt-debuginfo - update to 5.3.18-59.5.2
kernel-preempt-debugsource - update to 5.3.18-59.5.2
kernel-preempt - update to 5.3.18-59.5.2
kernel-preempt-extra - update to 5.3.18-59.5.2
kernel-preempt-extra-debuginfo - update to 5.3.18-59.5.2
kernel-default-livepatch-devel - update to 5.3.18-59.5.2
reiserfs-kmp-default - update to 5.3.18-59.5.2
reiserfs-kmp-default-debuginfo - update to 5.3.18-59.5.2
kernel-preempt-devel - update to 5.3.18-59.5.2
kernel-preempt-devel-debuginfo - update to 5.3.18-59.5.2
kernel-docs - update to 5.3.18-59.5.2
kernel-source - update to 5.3.18-59.5.2
kernel-default - update to 5.3.18-59.5.2
kernel-default-devel - update to 5.3.18-59.5.2
kernel-default-devel-debuginfo - update to 5.3.18-59.5.2
kernel-default-base - update to 5.3.18-59.5.2.18.2.2
linux-image-oem-20.04 (Ubuntu package) - update to 5.8.0.53.58
linux-image-virtual (Ubuntu package) - addressed in versions 5.8.0.53.58, 5.11.0.17.18
linux-image-generic (Ubuntu package) - addressed in versions 5.8.0.53.58, 5.11.0.17.18
linux-image-generic-64k (Ubuntu package) - addressed in versions 5.8.0.53.58, 5.11.0.17.18
linux-image-generic-lpae (Ubuntu package) - addressed in versions 5.8.0.53.58, 5.11.0.17.18
linux-image-lowlatency (Ubuntu package) - addressed in versions 5.8.0.53.58, 5.11.0.17.18
linux-image-5.8.0-53-generic (Ubuntu package) - update to 5.8.0-53.60~20.04.1
linux-image-5.8.0-53-lowlatency (Ubuntu package) - update to 5.8.0-53.60~20.04.1
linux-image-5.8.0-53-generic-lpae (Ubuntu package) - update to 5.8.0-53.60~20.04.1
linux-image-5.8.0-53-generic-64k (Ubuntu package) - update to 5.8.0-53.60~20.04.1
linux-image-virtual-hwe-20.04 (Ubuntu package) - update to 5.8.0.53.60~20.04.37
linux-image-generic-64k-hwe-20.04 (Ubuntu package) - update to 5.8.0.53.60~20.04.37
linux-image-generic-hwe-20.04 (Ubuntu package) - update to 5.8.0.53.60~20.04.37
linux-image-generic-lpae-hwe-20.04 (Ubuntu package) - update to 5.8.0.53.60~20.04.37
linux-image-lowlatency-hwe-20.04 (Ubuntu package) - update to 5.8.0.53.60~20.04.37
linux-image-5.8.0-1024-raspi-nolpae (Ubuntu package) - update to 5.8.0-1024.27
linux-image-5.8.0-1024-raspi (Ubuntu package) - update to 5.8.0-1024.27
linux-image-raspi (Ubuntu package) - addressed in versions 5.8.0.1024.27, 5.11.0.1008.6
linux-image-raspi-nolpae (Ubuntu package) - addressed in versions 5.8.0.1024.27, 5.11.0.1008.6
linux-image-kvm (Ubuntu package) - addressed in versions 5.8.0.1027.29, 5.11.0.1007.7
linux-image-5.8.0-1027-kvm (Ubuntu package) - update to 5.8.0-1027.29
linux-image-oracle (Ubuntu package) - addressed in versions 5.8.0.1029.28, 5.11.0.1006.6
linux-image-5.8.0-1029-oracle (Ubuntu package) - update to 5.8.0-1029.30
linux-image-gke (Ubuntu package) - addressed in versions 5.8.0.1031.31, 5.11.0.1007.7
linux-image-gcp (Ubuntu package) - addressed in versions 5.8.0.1031.31, 5.11.0.1007.7
linux-image-5.8.0-1031-gcp (Ubuntu package) - update to 5.8.0-1031.32
linux-image-azure (Ubuntu package) - addressed in versions 5.8.0.1032.32, 5.11.0.1005.5
linux-image-5.8.0-1032-azure (Ubuntu package) - update to 5.8.0-1032.34
linux-image-5.8.0-1033-aws (Ubuntu package) - update to 5.8.0-1033.35
linux-image-aws (Ubuntu package) - addressed in versions 5.8.0.1033.35, 5.11.0.1007.7
linux-image-oem-20.04b (Ubuntu package) - update to 5.10.0.1026.27
linux-image-5.10.0-1026-oem (Ubuntu package) - update to 5.10.0-1026.27
linux-image-5.11.0-17-generic (Ubuntu package) - update to 5.11.0-17.18
linux-image-5.11.0-17-generic-64k (Ubuntu package) - update to 5.11.0-17.18
linux-image-5.11.0-17-generic-lpae (Ubuntu package) - update to 5.11.0-17.18
linux-image-5.11.0-17-lowlatency (Ubuntu package) - update to 5.11.0-17.18
linux-image-5.11.0-1005-azure (Ubuntu package) - update to 5.11.0-1005.5
linux-image-5.11.0-1006-oracle (Ubuntu package) - update to 5.11.0-1006.6
linux-image-5.11.0-1007-gcp (Ubuntu package) - update to 5.11.0-1007.7
linux-image-5.11.0-1007-aws (Ubuntu package) - update to 5.11.0-1007.7
linux-image-5.11.0-1007-kvm (Ubuntu package) - update to 5.11.0-1007.7
linux-image-5.11.0-1008-raspi (Ubuntu package) - update to 5.11.0-1008.8
linux-image-5.11.0-1008-raspi-nolpae (Ubuntu package) - update to 5.11.0-1008.8
kernel - addressed in versions 5.11.20-100.fc32, 5.11.20-200.fc33, 5.11.20-300.fc34
kernel-headers - addressed in versions 5.11.20-100.fc32, 5.11.20-200.fc33, 5.11.20-300.fc34
kernel-tools - addressed in versions 5.11.20-100.fc32, 5.11.20-200.fc33, 5.11.20-300.fc34

• https://www.zerodayinitiative.com/advisories/ZDI-21-590/
• https://ubuntu.com/security/notices/USN-4949-1
• https://ubuntu.com/security/notices/USN-4950-1
• https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git/commit/?id=4b81ccebaeee885ab1aa1438133f2991e3a2b6ea
• https://www.openwall.com/lists/oss-security/2021/05/11/10
• https://security.netapp.com/advisory/ntap-20210716-0004/

• Out-of-bounds read in Linux kernel bpf
• Red Hat Enterprise Linux 8 update for kernel-rt
• Red Hat Enterprise Linux 8 update for kernel
• SUSE update for the Linux Kernel
• SUSE update for the Linux Kernel
• SUSE update for the Linux Kernel (Live Patch 0 for SLE 15 SP3)
• Ubuntu update for linux
• Ubuntu update for linux
• Ubuntu update for linux-oem-5.10
• Fedora 34 update for kernel, kernel-headers, kernel-tools
• Fedora 32 update for kernel, kernel-headers, kernel-tools
• Fedora 33 update for kernel, kernel-headers, kernel-tools