Incorrect comparison in Linux kernel - CVE-2021-20219

Vulnerability identifier: #VU95683

CSH Severity: Low

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

CVE-ID: CVE-2021-20219

CWE-ID: CWE-697

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to perform a denial of service (DoS) attack.

A denial of service vulnerability was found in n_tty_receive_char_special in drivers/tty/n_tty.c of the Linux kernel. In this flaw a local attacker with a normal user privilege could delay the loop (due to a changing ldata->read_head, and a missing sanity check) and cause a threat to the system availability.

Linux kernel
SUSE CaaS Platform
SUSE Manager Proxy
SUSE Manager Retail Branch Server
SUSE Manager Server
SUSE Enterprise Storage
HPE Helion Openstack
SUSE OpenStack Cloud
SUSE OpenStack Cloud Crowbar
SUSE Linux Enterprise Server
SUSE Linux Enterprise High Availability
SUSE Linux Enterprise Server for SAP
SUSE Linux Enterprise Live Patching
SUSE Linux Enterprise Software Development Kit
SUSE Linux Enterprise Real Time Extension
SUSE Linux Enterprise Workstation Extension
SUSE Linux Enterprise High Performance Computing
SUSE Linux Enterprise Module for Live Patching
kernel-livepatch-4_12_14-150_72-default-debuginfo
kernel-livepatch-4_12_14-150_72-default
kernel-livepatch-4_12_14-197_89-default
kgraft-patch-4_4_180-94_144-default
kgraft-patch-4_4_180-94_144-default-debuginfo
kgraft-patch-4_12_14-95_74-default
kgraft-patch-4_12_14-122_66-default
ocfs2-kmp-default
kernel-syms
kernel-devel
kernel-macros
kernel-source
cluster-md-kmp-default
cluster-md-kmp-default-debuginfo
cluster-network-kmp-default
cluster-network-kmp-default-debuginfo
dlm-kmp-default
dlm-kmp-default-debuginfo
gfs2-kmp-default
gfs2-kmp-default-debuginfo
kernel-default
kernel-default-base
kernel-default-base-debuginfo
kernel-default-debuginfo
kernel-default-debugsource
kernel-default-devel
ocfs2-kmp-default-debuginfo
kernel-default-man
kernel-default-kgraft
kernel-rt_debug-devel-debuginfo
kernel-syms-rt
ocfs2-kmp-rt
ocfs2-kmp-rt-debuginfo
kernel-devel-rt
kernel-source-rt
kernel-rt_debug-debuginfo
kernel-rt_debug-debugsource
cluster-md-kmp-rt
cluster-md-kmp-rt-debuginfo
dlm-kmp-rt
dlm-kmp-rt-debuginfo
gfs2-kmp-rt
gfs2-kmp-rt-debuginfo
kernel-rt
kernel-rt-base
kernel-rt-base-debuginfo
kernel-rt-debuginfo
kernel-rt-debugsource
kernel-rt-devel
kernel-rt-devel-debuginfo
kernel-rt_debug
kernel-rt_debug-devel
kernel-devel-azure
kernel-azure
kernel-azure-base
kernel-azure-base-debuginfo
kernel-azure-debuginfo
kernel-azure-debugsource
kernel-azure-devel
kernel-syms-azure
kernel-source-azure
kernel-default-devel-debuginfo
kernel-default-kgraft-devel
kernel-docs
kernel-obs-build-debugsource
kernel-obs-build
kernel-default-extra-debuginfo
kernel-default-extra
kernel-default-livepatch
kernel-zfcpdump-debugsource
kernel-zfcpdump-debuginfo
kernel-vanilla-base
kernel-vanilla-base-debuginfo
kernel-vanilla-debuginfo
kernel-vanilla-debugsource
reiserfs-kmp-default
reiserfs-kmp-default-debuginfo
kernel-default-livepatch-devel

Install update from vendor's repository.

kernel-livepatch-4_12_14-150_72-default-debuginfo - update to 1-1.3.1
kernel-livepatch-4_12_14-150_72-default - update to 1-1.3.1
kernel-livepatch-4_12_14-197_89-default - update to 1-3.3.2
kgraft-patch-4_4_180-94_144-default - update to 1-4.3.1
kgraft-patch-4_4_180-94_144-default-debuginfo - update to 1-4.3.1
kgraft-patch-4_12_14-95_74-default - update to 1-6.3.1
kgraft-patch-4_12_14-122_66-default - update to 1-8.3.2
ocfs2-kmp-default - addressed in versions 4.4.121-92.155.1, 4.4.180-94.144.1, 4.12.14-95.74.1, 4.12.14-122.66.2, 4.12.14-150.72.1, 4.12.14-197.89.2
kernel-syms - addressed in versions 4.4.121-92.155.1, 4.4.180-94.144.1, 4.12.14-95.74.1, 4.12.14-122.66.2, 4.12.14-150.72.1, 4.12.14-197.89.2
kernel-devel - addressed in versions 4.4.121-92.155.1, 4.4.180-94.144.1, 4.12.14-95.74.1, 4.12.14-122.66.2, 4.12.14-150.72.1, 4.12.14-197.89.2
kernel-macros - addressed in versions 4.4.121-92.155.1, 4.4.180-94.144.1, 4.12.14-95.74.1, 4.12.14-122.66.2, 4.12.14-150.72.1, 4.12.14-197.89.2
kernel-source - addressed in versions 4.4.121-92.155.1, 4.4.180-94.144.1, 4.12.14-95.74.1, 4.12.14-122.66.2, 4.12.14-150.72.1, 4.12.14-197.89.2
cluster-md-kmp-default - addressed in versions 4.4.121-92.155.1, 4.4.180-94.144.1, 4.12.14-95.74.1, 4.12.14-122.66.2, 4.12.14-150.72.1, 4.12.14-197.89.2
cluster-md-kmp-default-debuginfo - addressed in versions 4.4.121-92.155.1, 4.4.180-94.144.1, 4.12.14-95.74.1, 4.12.14-122.66.2, 4.12.14-150.72.1, 4.12.14-197.89.2
cluster-network-kmp-default - update to 4.4.121-92.155.1
cluster-network-kmp-default-debuginfo - update to 4.4.121-92.155.1
dlm-kmp-default - addressed in versions 4.4.121-92.155.1, 4.4.180-94.144.1, 4.12.14-95.74.1, 4.12.14-122.66.2, 4.12.14-150.72.1, 4.12.14-197.89.2
dlm-kmp-default-debuginfo - addressed in versions 4.4.121-92.155.1, 4.4.180-94.144.1, 4.12.14-95.74.1, 4.12.14-122.66.2, 4.12.14-150.72.1, 4.12.14-197.89.2
gfs2-kmp-default - addressed in versions 4.4.121-92.155.1, 4.4.180-94.144.1, 4.12.14-95.74.1, 4.12.14-122.66.2, 4.12.14-150.72.1, 4.12.14-197.89.2
gfs2-kmp-default-debuginfo - addressed in versions 4.4.121-92.155.1, 4.4.180-94.144.1, 4.12.14-95.74.1, 4.12.14-122.66.2, 4.12.14-150.72.1, 4.12.14-197.89.2
kernel-default - addressed in versions 4.4.121-92.155.1, 4.4.180-94.144.1, 4.12.14-95.74.1, 4.12.14-122.66.2, 4.12.14-150.72.1, 4.12.14-197.89.2
kernel-default-base - addressed in versions 4.4.121-92.155.1, 4.4.180-94.144.1, 4.12.14-95.74.1, 4.12.14-122.66.2, 4.12.14-150.72.1, 4.12.14-197.89.2
kernel-default-base-debuginfo - addressed in versions 4.4.121-92.155.1, 4.4.180-94.144.1, 4.12.14-95.74.1, 4.12.14-122.66.2, 4.12.14-197.89.2
kernel-default-debuginfo - addressed in versions 4.4.121-92.155.1, 4.4.180-94.144.1, 4.12.14-95.74.1, 4.12.14-122.66.2, 4.12.14-150.72.1, 4.12.14-197.89.2
kernel-default-debugsource - addressed in versions 4.4.121-92.155.1, 4.4.180-94.144.1, 4.12.14-95.74.1, 4.12.14-122.66.2, 4.12.14-150.72.1, 4.12.14-197.89.2
kernel-default-devel - addressed in versions 4.4.121-92.155.1, 4.4.180-94.144.1, 4.12.14-95.74.1, 4.12.14-122.66.2, 4.12.14-150.72.1, 4.12.14-197.89.2
ocfs2-kmp-default-debuginfo - addressed in versions 4.4.121-92.155.1, 4.4.180-94.144.1, 4.12.14-95.74.1, 4.12.14-122.66.2, 4.12.14-150.72.1, 4.12.14-197.89.2
kernel-default-man - addressed in versions 4.4.180-94.144.1, 4.12.14-95.74.1, 4.12.14-122.66.2, 4.12.14-150.72.1, 4.12.14-197.89.2
kernel-default-kgraft - addressed in versions 4.4.180-94.144.1, 4.12.14-95.74.1, 4.12.14-122.66.2
kernel-rt_debug-devel-debuginfo - update to 4.12.14-10.40.1
kernel-syms-rt - update to 4.12.14-10.40.1
ocfs2-kmp-rt - update to 4.12.14-10.40.1
ocfs2-kmp-rt-debuginfo - update to 4.12.14-10.40.1
kernel-devel-rt - update to 4.12.14-10.40.1
kernel-source-rt - update to 4.12.14-10.40.1
kernel-rt_debug-debuginfo - update to 4.12.14-10.40.1
kernel-rt_debug-debugsource - update to 4.12.14-10.40.1
cluster-md-kmp-rt - update to 4.12.14-10.40.1
cluster-md-kmp-rt-debuginfo - update to 4.12.14-10.40.1
dlm-kmp-rt - update to 4.12.14-10.40.1
dlm-kmp-rt-debuginfo - update to 4.12.14-10.40.1
gfs2-kmp-rt - update to 4.12.14-10.40.1
gfs2-kmp-rt-debuginfo - update to 4.12.14-10.40.1
kernel-rt - update to 4.12.14-10.40.1
kernel-rt-base - update to 4.12.14-10.40.1
kernel-rt-base-debuginfo - update to 4.12.14-10.40.1
kernel-rt-debuginfo - update to 4.12.14-10.40.1
kernel-rt-debugsource - update to 4.12.14-10.40.1
kernel-rt-devel - update to 4.12.14-10.40.1
kernel-rt-devel-debuginfo - update to 4.12.14-10.40.1
kernel-rt_debug - update to 4.12.14-10.40.1
kernel-rt_debug-devel - update to 4.12.14-10.40.1
kernel-devel-azure - update to 4.12.14-16.53.1
kernel-azure - update to 4.12.14-16.53.1
kernel-azure-base - update to 4.12.14-16.53.1
kernel-azure-base-debuginfo - update to 4.12.14-16.53.1
kernel-azure-debuginfo - update to 4.12.14-16.53.1
kernel-azure-debugsource - update to 4.12.14-16.53.1
kernel-azure-devel - update to 4.12.14-16.53.1
kernel-syms-azure - update to 4.12.14-16.53.1
kernel-source-azure - update to 4.12.14-16.53.1
kernel-default-devel-debuginfo - addressed in versions 4.12.14-95.74.1, 4.12.14-122.66.2, 4.12.14-150.72.1, 4.12.14-197.89.2
kernel-default-kgraft-devel - addressed in versions 4.12.14-95.74.1, 4.12.14-122.66.2
kernel-docs - addressed in versions 4.12.14-122.66.2, 4.12.14-150.72.2, 4.12.14-197.89.3
kernel-obs-build-debugsource - addressed in versions 4.12.14-122.66.2, 4.12.14-150.72.1, 4.12.14-197.89.2
kernel-obs-build - addressed in versions 4.12.14-122.66.2, 4.12.14-150.72.1, 4.12.14-197.89.2
kernel-default-extra-debuginfo - update to 4.12.14-122.66.2
kernel-default-extra - update to 4.12.14-122.66.2
kernel-default-livepatch - addressed in versions 4.12.14-150.72.1, 4.12.14-197.89.2
kernel-zfcpdump-debugsource - addressed in versions 4.12.14-150.72.1, 4.12.14-197.89.2
kernel-zfcpdump-debuginfo - addressed in versions 4.12.14-150.72.1, 4.12.14-197.89.2
kernel-vanilla-base - update to 4.12.14-150.72.1
kernel-vanilla-base-debuginfo - update to 4.12.14-150.72.1
kernel-vanilla-debuginfo - update to 4.12.14-150.72.1
kernel-vanilla-debugsource - update to 4.12.14-150.72.1
reiserfs-kmp-default - addressed in versions 4.12.14-150.72.1, 4.12.14-197.89.2
reiserfs-kmp-default-debuginfo - addressed in versions 4.12.14-150.72.1, 4.12.14-197.89.2
kernel-default-livepatch-devel - update to 4.12.14-197.89.2

• https://bugzilla.redhat.com/show_bug.cgi?id=1923738

• Incorrect comparison in Linux kernel
• SUSE update for the Linux Kernel
• SUSE update for the Linux Kernel
• SUSE update for the Linux Kernel
• SUSE update for the Linux Kernel
• SUSE update for the Linux Kernel
• SUSE update for the Linux Kernel
• SUSE update for the Linux Kernel
• SUSE update for the Linux Kernel