Input validation error in Linux kernel - CVE-2021-20320

Vulnerability identifier: #VU94152

CSH Severity: Low

CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2021-20320

CWE-ID: CWE-20

Exploitation vector: Local access

Exploit availability: No public exploit available

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

A flaw was found in s390 eBPF JIT in bpf_jit_insn in arch/s390/net/bpf_jit_comp.c in the Linux kernel. In this flaw, a local attacker with special user privilege can circumvent the verifier and may lead to a confidentiality problem.

Linux kernel
SUSE Linux Enterprise Server 12 SP5
SUSE Linux Enterprise Server 12 SP5 LTSS Extended
SUSE Linux Enterprise High Performance Computing 12
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise Server for SAP Applications 12
SUSE Linux Enterprise Live Patching
Slackware Linux
SUSE Linux Enterprise High Performance Computing
SUSE Linux Enterprise Server
SUSE Linux Enterprise Server for SAP
SUSE Linux Enterprise Module for Live Patching
SUSE Linux Enterprise High Availability
kernel-livepatch-4_12_14-150_78-default
kernel-livepatch-4_12_14-150_78-default-debuginfo
kgraft-patch-4_12_14-122_261-default
linux-4.4.301/kernel-modules
linux-4.4.301/kernel-huge
linux-4.4.301/kernel-generic
linux-4.4.301/kernel-headers
ocfs2-kmp-default-debuginfo
dlm-kmp-default-debuginfo
kernel-default-kgraft-devel
kernel-default-kgraft
kernel-default-devel-debuginfo
kernel-default-man
kernel-devel
kernel-macros
cluster-md-kmp-default
dlm-kmp-default
kernel-source
kernel-default-debuginfo
kernel-default-debugsource
kernel-syms
ocfs2-kmp-default
gfs2-kmp-default
gfs2-kmp-default-debuginfo
kernel-default-devel
kernel-default-base
kernel-default-base-debuginfo
cluster-md-kmp-default-debuginfo
kernel-default
kernel-zfcpdump-debuginfo
kernel-zfcpdump-debugsource
kernel-default-livepatch
kernel-vanilla-base
kernel-vanilla-base-debuginfo
kernel-vanilla-debuginfo
kernel-vanilla-debugsource
reiserfs-kmp-default
reiserfs-kmp-default-debuginfo
kernel-docs
kernel-obs-build-debugsource
kernel-obs-build

Install update from vendor's website.

kernel-livepatch-4_12_14-150_78-default - update to 1-1.3.1
kernel-livepatch-4_12_14-150_78-default-debuginfo - update to 1-1.3.1
kgraft-patch-4_12_14-122_261-default - update to 1-8.3.1
linux-4.4.301/kernel-modules - update to 4.4.301
linux-4.4.301/kernel-huge - update to 4.4.301
linux-4.4.301/kernel-generic - update to 4.4.301
linux-4.4.301/kernel-headers - update to 4.4.301_smp
ocfs2-kmp-default-debuginfo - addressed in versions 4.12.14-122.261.1, 4.12.14-150.78.1
dlm-kmp-default-debuginfo - addressed in versions 4.12.14-122.261.1, 4.12.14-150.78.1
kernel-default-kgraft-devel - update to 4.12.14-122.261.1
kernel-default-kgraft - update to 4.12.14-122.261.1
kernel-default-devel-debuginfo - addressed in versions 4.12.14-122.261.1, 4.12.14-150.78.1
kernel-default-man - addressed in versions 4.12.14-122.261.1, 4.12.14-150.78.1
kernel-devel - addressed in versions 4.12.14-122.261.1, 4.12.14-150.78.1
kernel-macros - addressed in versions 4.12.14-122.261.1, 4.12.14-150.78.1
cluster-md-kmp-default - addressed in versions 4.12.14-122.261.1, 4.12.14-150.78.1
dlm-kmp-default - addressed in versions 4.12.14-122.261.1, 4.12.14-150.78.1
kernel-source - addressed in versions 4.12.14-122.261.1, 4.12.14-150.78.1
kernel-default-debuginfo - addressed in versions 4.12.14-122.261.1, 4.12.14-150.78.1
kernel-default-debugsource - addressed in versions 4.12.14-122.261.1, 4.12.14-150.78.1
kernel-syms - addressed in versions 4.12.14-122.261.1, 4.12.14-150.78.1
ocfs2-kmp-default - addressed in versions 4.12.14-122.261.1, 4.12.14-150.78.1
gfs2-kmp-default - addressed in versions 4.12.14-122.261.1, 4.12.14-150.78.1
gfs2-kmp-default-debuginfo - addressed in versions 4.12.14-122.261.1, 4.12.14-150.78.1
kernel-default-devel - addressed in versions 4.12.14-122.261.1, 4.12.14-150.78.1
kernel-default-base - addressed in versions 4.12.14-122.261.1, 4.12.14-150.78.1
kernel-default-base-debuginfo - update to 4.12.14-122.261.1
cluster-md-kmp-default-debuginfo - addressed in versions 4.12.14-122.261.1, 4.12.14-150.78.1
kernel-default - addressed in versions 4.12.14-122.261.1, 4.12.14-150.78.1
kernel-zfcpdump-debuginfo - update to 4.12.14-150.78.1
kernel-zfcpdump-debugsource - update to 4.12.14-150.78.1
kernel-default-livepatch - update to 4.12.14-150.78.1
kernel-vanilla-base - update to 4.12.14-150.78.1
kernel-vanilla-base-debuginfo - update to 4.12.14-150.78.1
kernel-vanilla-debuginfo - update to 4.12.14-150.78.1
kernel-vanilla-debugsource - update to 4.12.14-150.78.1
reiserfs-kmp-default - update to 4.12.14-150.78.1
reiserfs-kmp-default-debuginfo - update to 4.12.14-150.78.1
kernel-docs - update to 4.12.14-150.78.2
kernel-obs-build-debugsource - update to 4.12.14-150.78.2
kernel-obs-build - update to 4.12.14-150.78.2

• https://bugzilla.redhat.com/show_bug.cgi?id=2010090
• https://lore.kernel.org/bpf/20210902185229.1840281-1-johan.almbladh@anyfinetworks.com/

• Input validation error in Linux kernel
• SUSE update for the Linux Kernel
• Slackware Linux update for kernel
• SUSE update for the Linux Kernel