Out-of-bounds read in Linux kernel - CVE-2021-38166

Vulnerability identifier: #VU90365

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-2021-38166

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 kvmalloc() function in kernel/bpf/hashtab.c. A local user can execute arbitrary code.

Linux kernel
SUSE MicroOS
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
SUSE Linux Enterprise Module for Public Cloud
Ubuntu
Fedora
linux (Ubuntu package)
linux-raspi (Ubuntu package)
linux-oracle (Ubuntu package)
linux-gcp (Ubuntu package)
linux-kvm (Ubuntu package)
linux-azure (Ubuntu package)
linux-aws (Ubuntu package)
linux-oem-5.10 (Ubuntu package)
linux-hwe-5.11 (Ubuntu package)
linux-oracle-5.11 (Ubuntu package)
linux-azure-5.11 (Ubuntu package)
linux-aws-5.11 (Ubuntu package)
linux-gcp-5.11 (Ubuntu package)
kernel-livepatch-SLE15-SP3_Update_6-debugsource
kernel-livepatch-5_3_18-59_24-default-debuginfo
kernel-livepatch-5_3_18-59_24-default
kernel-syms-azure
kernel-devel-azure
kernel-source-azure
kernel-azure-debuginfo
kernel-azure
kernel-azure-devel-debuginfo
kernel-azure-devel
kernel-azure-debugsource
kernel-64kb-debugsource
kernel-64kb
kernel-64kb-debuginfo
kernel-64kb-devel
kernel-64kb-devel-debuginfo
kernel-devel
kernel-macros
kernel-zfcpdump
kernel-zfcpdump-debuginfo
kernel-preempt
kernel-zfcpdump-debugsource
cluster-md-kmp-default
cluster-md-kmp-default-debuginfo
dlm-kmp-default
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
kernel-default-devel
kernel-default-extra
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
kernel-obs-build
kernel-obs-build-debugsource
kernel-syms
kernel-preempt-devel
kernel-preempt-devel-debuginfo
kernel-docs
kernel-source
kernel-default-devel-debuginfo
reiserfs-kmp-default-debuginfo
kernel-default-base
kernel
linux-image-5.13.0-1014-oem (Ubuntu package)
linux-image-oem-20.04c (Ubuntu package)

Install update from vendor's website.

linux (Ubuntu package) - update to 5.11.0-38.42
linux-raspi (Ubuntu package) - update to 5.11.0-1021.22
linux-oracle (Ubuntu package) - update to 5.11.0-1020.21
linux-gcp (Ubuntu package) - update to 5.11.0-1021.23
linux-kvm (Ubuntu package) - update to 5.11.0-1018.19
linux-azure (Ubuntu package) - update to 5.11.0-1020.21
linux-aws (Ubuntu package) - update to 5.11.0-1020.21
linux-oem-5.10 (Ubuntu package) - update to 5.10.0-1050.52
linux-hwe-5.11 (Ubuntu package) - update to 5.11.0-38.42~20.04.1
linux-oracle-5.11 (Ubuntu package) - update to 5.11.0-1020.21~20.04.1
linux-azure-5.11 (Ubuntu package) - update to 5.11.0-1020.21~20.04.1
linux-aws-5.11 (Ubuntu package) - update to 5.11.0-1020.21~20.04.2
linux-gcp-5.11 (Ubuntu package) - update to 5.11.0-1021.23~20.04.1
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
kernel-syms-azure - update to 5.3.18-38.22.1
kernel-devel-azure - update to 5.3.18-38.22.1
kernel-source-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-devel-debuginfo - update to 5.3.18-38.22.2
kernel-azure-devel - update to 5.3.18-38.22.2
kernel-azure-debugsource - update to 5.3.18-38.22.2
kernel-64kb-debugsource - update to 5.3.18-59.24.1
kernel-64kb - update to 5.3.18-59.24.1
kernel-64kb-debuginfo - 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-preempt - 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
dlm-kmp-default - 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
kernel-default-devel - update to 5.3.18-59.24.1
kernel-default-extra - update to 5.3.18-59.24.1
kernel-default-extra-debuginfo - update to 5.3.18-59.24.1
kernel-preempt-debuginfo - update to 5.3.18-59.24.1
kernel-preempt-debugsource - update to 5.3.18-59.24.1
kernel-preempt-extra - update to 5.3.18-59.24.1
kernel-preempt-extra-debuginfo - update to 5.3.18-59.24.1
kernel-default-livepatch - update to 5.3.18-59.24.1
kernel-default-livepatch-devel - update to 5.3.18-59.24.1
reiserfs-kmp-default - update to 5.3.18-59.24.1
kernel-obs-build - 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-debuginfo - update to 5.3.18-59.24.1
reiserfs-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
kernel - addressed in versions 5.13.10-100.fc33, 5.13.10-200.fc34
linux-image-5.13.0-1014-oem (Ubuntu package) - update to 5.13.0-1014.18
linux-image-oem-20.04c (Ubuntu package) - update to 5.13.0.1014.18

• https://lore.kernel.org/bpf/20210806150419.109658-1-th.yasumatsu@gmail.com/
• https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git/commit/?id=c4eb1f403243fc7bbb7de644db8587c03de36da6
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UL6CH5M5PRLMA3KPBX4LPUO6Z73GRISO/
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GUVLBJKZMWA3E3YXSH4SZ7BOYGJP4GXP/
• https://security.netapp.com/advisory/ntap-20210909-0001/
• https://www.debian.org/security/2021/dsa-4978

• Out-of-bounds read in Linux kernel bpf
• SUSE update for the Linux Kernel
• SUSE update for the Linux Kernel
• SUSE update for the Linux Kernel
• Ubuntu update for linux-oem-5.13
• Fedora 33 update for kernel
• Fedora 34 update for kernel
• Ubuntu update for linux, linux-aws, linux-aws-5.11 and more
• Ubuntu update for linux-oem-5.10