Input validation error in Linux kernel - CVE-2021-20268

Vulnerability identifier: #VU64199

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-2021-20268

CWE-ID: CWE-20

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 in the Linux kernel's implementation of the eBPF code verifier in the way a user running the eBPF script calls dev_map_init_map or sock_map_alloc. A local user can crash the system or escalate privileges on the system.

Linux kernel
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
Ubuntu
kernel-livepatch-SLE15-SP3_Update_1-debugsource
kernel-livepatch-5_3_18-59_5-default-debuginfo
kernel-livepatch-5_3_18-59_5-default
kernel-azure
kernel-azure-debuginfo
kernel-azure-debugsource
kernel-azure-devel
kernel-azure-devel-debuginfo
kernel-syms-azure
kernel-devel-azure
kernel-source-azure
kernel-obs-build
kernel-obs-build-debugsource
kernel-syms
kernel-devel
kernel-default-devel-debuginfo
kernel-64kb-devel-debuginfo
kernel-64kb-devel
kernel-64kb-debugsource
kernel-64kb-debuginfo
kernel-64kb
kernel-preempt
kernel-macros
kernel-zfcpdump
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
gfs2-kmp-default-debuginfo
ocfs2-kmp-default
ocfs2-kmp-default-debuginfo
reiserfs-kmp-default
kernel-default-debugsource
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
kernel-default-devel
reiserfs-kmp-default-debuginfo
kernel-preempt-devel
kernel-preempt-devel-debuginfo
kernel-docs
kernel-source
kernel-default
kernel-default-debuginfo
kernel-default-base
linux-image-virtual (Ubuntu package)
linux-image-oem-20.04 (Ubuntu package)
linux-image-lowlatency (Ubuntu package)
linux-image-generic-lpae (Ubuntu package)
linux-image-generic-64k (Ubuntu package)
linux-image-generic (Ubuntu package)
linux-image-5.8.0-49-generic (Ubuntu package)
linux-image-5.8.0-49-generic-64k (Ubuntu package)
linux-image-5.8.0-49-generic-lpae (Ubuntu package)
linux-image-5.8.0-49-lowlatency (Ubuntu package)
linux-image-virtual-hwe-20.04 (Ubuntu package)
linux-image-lowlatency-hwe-20.04 (Ubuntu package)
linux-image-generic-lpae-hwe-20.04 (Ubuntu package)
linux-image-generic-hwe-20.04 (Ubuntu package)
linux-image-generic-64k-hwe-20.04 (Ubuntu package)
linux-image-raspi (Ubuntu package)
linux-image-raspi-nolpae (Ubuntu package)
linux-image-5.8.0-1020-raspi-nolpae (Ubuntu package)
linux-image-5.8.0-1020-raspi (Ubuntu package)
linux-image-kvm (Ubuntu package)
linux-image-5.8.0-1023-kvm (Ubuntu package)
linux-image-oracle (Ubuntu package)
linux-image-5.8.0-1025-oracle (Ubuntu package)
linux-image-gcp (Ubuntu package)
linux-image-azure (Ubuntu package)
linux-image-gke (Ubuntu package)
linux-image-5.8.0-1027-gcp (Ubuntu package)
linux-image-5.8.0-1027-azure (Ubuntu package)
linux-image-aws (Ubuntu package)
linux-image-5.8.0-1028-aws (Ubuntu package)
Pixel

Install updates from vendor's website.

Linux kernel - update to 5.10.10
kernel-livepatch-SLE15-SP3_Update_1-debugsource - update to 1-7.5.1
kernel-livepatch-5_3_18-59_5-default-debuginfo - update to 1-7.5.1
kernel-livepatch-5_3_18-59_5-default - update to 1-7.5.1
kernel-azure - update to 5.3.18-38.3.1
kernel-azure-debuginfo - update to 5.3.18-38.3.1
kernel-azure-debugsource - update to 5.3.18-38.3.1
kernel-azure-devel - update to 5.3.18-38.3.1
kernel-azure-devel-debuginfo - update to 5.3.18-38.3.1
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-obs-build - update to 5.3.18-59.5.1
kernel-obs-build-debugsource - 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-default-devel-debuginfo - 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-64kb-debuginfo - update to 5.3.18-59.5.2
kernel-64kb - update to 5.3.18-59.5.2
kernel-preempt - 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-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
gfs2-kmp-default-debuginfo - 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
reiserfs-kmp-default - 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-extra - update to 5.3.18-59.5.2
kernel-preempt-extra-debuginfo - update to 5.3.18-59.5.2
kernel-default-livepatch - update to 5.3.18-59.5.2
kernel-default-livepatch-devel - update to 5.3.18-59.5.2
kernel-default-devel - 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-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-virtual (Ubuntu package) - update to 5.8.0.49.54
linux-image-oem-20.04 (Ubuntu package) - update to 5.8.0.49.54
linux-image-lowlatency (Ubuntu package) - update to 5.8.0.49.54
linux-image-generic-lpae (Ubuntu package) - update to 5.8.0.49.54
linux-image-generic-64k (Ubuntu package) - update to 5.8.0.49.54
linux-image-generic (Ubuntu package) - update to 5.8.0.49.54
linux-image-5.8.0-49-generic (Ubuntu package) - update to 5.8.0-49.55~20.04.1
linux-image-5.8.0-49-generic-64k (Ubuntu package) - update to 5.8.0-49.55~20.04.1
linux-image-5.8.0-49-generic-lpae (Ubuntu package) - update to 5.8.0-49.55~20.04.1
linux-image-5.8.0-49-lowlatency (Ubuntu package) - update to 5.8.0-49.55~20.04.1
linux-image-virtual-hwe-20.04 (Ubuntu package) - update to 5.8.0.49.55~20.04.33
linux-image-lowlatency-hwe-20.04 (Ubuntu package) - update to 5.8.0.49.55~20.04.33
linux-image-generic-lpae-hwe-20.04 (Ubuntu package) - update to 5.8.0.49.55~20.04.33
linux-image-generic-hwe-20.04 (Ubuntu package) - update to 5.8.0.49.55~20.04.33
linux-image-generic-64k-hwe-20.04 (Ubuntu package) - update to 5.8.0.49.55~20.04.33
linux-image-raspi (Ubuntu package) - update to 5.8.0.1020.23
linux-image-raspi-nolpae (Ubuntu package) - update to 5.8.0.1020.23
linux-image-5.8.0-1020-raspi-nolpae (Ubuntu package) - update to 5.8.0-1020.23
linux-image-5.8.0-1020-raspi (Ubuntu package) - update to 5.8.0-1020.23
linux-image-kvm (Ubuntu package) - update to 5.8.0.1023.25
linux-image-5.8.0-1023-kvm (Ubuntu package) - update to 5.8.0-1023.25
linux-image-oracle (Ubuntu package) - update to 5.8.0.1025.24
linux-image-5.8.0-1025-oracle (Ubuntu package) - update to 5.8.0-1025.26
linux-image-gcp (Ubuntu package) - update to 5.8.0.1027.27
linux-image-azure (Ubuntu package) - update to 5.8.0.1027.27
linux-image-gke (Ubuntu package) - update to 5.8.0.1027.27
linux-image-5.8.0-1027-gcp (Ubuntu package) - update to 5.8.0-1027.28
linux-image-5.8.0-1027-azure (Ubuntu package) - update to 5.8.0-1027.29
linux-image-aws (Ubuntu package) - update to 5.8.0.1028.30
linux-image-5.8.0-1028-aws (Ubuntu package) - update to 5.8.0-1028.30
Pixel - update to 12L 2022-06-05

• https://bugzilla.redhat.com/show_bug.cgi?id=1923816
• https://lore.kernel.org/bpf/CACAyw99bEYWJCSGqfLiJ9Jp5YE1ZsZSiJxb4RFUTwbofipf0dA@mail.gmail.com/T/#m8929643e99bea9c18ed490a7bc2591145eac6444
• https://security.netapp.com/advisory/ntap-20210409-0006/

• Multiple vulnerabilities in Google Pixel
• SUSE update for the Linux Kernel
• SUSE update for the Linux Kernel
• Ubuntu update for linux