NULL pointer dereference in Linux kernel - CVE-2021-46904

Vulnerability identifier: #VU87990

CSH Severity: Low

CVSS v4 BT: 4.3 [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/E:U/U:Clear]

CVE-ID: CVE-2021-46904

CWE-ID: CWE-476

Exploitation vector: Local access

Exploit availability: No public exploit available

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

The vulnerability exists due to a NULL pointer dereference error during tty device unregistration
 within the get_free_serial_index() function in drivers/net/usb/hso.c. A local user can perform a denial of service (DoS) attack.

Linux kernel
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise Software Development Kit 12
SUSE Linux Enterprise Server for SAP Applications 12
SUSE Linux Enterprise High Performance Computing 12
SUSE Linux Enterprise High Availability Extension 12
SUSE Linux Enterprise Real Time 12
SUSE Linux Enterprise Live Patching
SUSE Linux Enterprise Workstation Extension 12
Ubuntu
openEuler
Dell Data Protection Central
PowerProtect DP Series Appliance (IDPA)
EMC Cloud Tiering Appliance
linux-image-virtual (Ubuntu package)
linux-image-server (Ubuntu package)
linux-image-lowlatency (Ubuntu package)
linux-image-generic-lts-trusty (Ubuntu package)
linux-image-generic (Ubuntu package)
linux-image-3.13.0-199-lowlatency (Ubuntu package)
linux-image-3.13.0-199-generic (Ubuntu package)
kgraft-patch-4_12_14-122_212-default
kernel-rt-devel
gfs2-kmp-rt-debuginfo
cluster-md-kmp-rt-debuginfo
kernel-rt_debug-debuginfo
dlm-kmp-rt
ocfs2-kmp-rt
kernel-rt_debug-debugsource
kernel-syms-rt
kernel-rt-devel-debuginfo
kernel-rt-base-debuginfo
kernel-rt-base
kernel-rt
gfs2-kmp-rt
cluster-md-kmp-rt
kernel-rt-debugsource
kernel-rt-debuginfo
dlm-kmp-rt-debuginfo
ocfs2-kmp-rt-debuginfo
kernel-rt_debug-devel-debuginfo
kernel-rt_debug-devel
kernel-devel-rt
kernel-source-rt
kernel-rt_debug
kernel-azure
kernel-source-azure
kernel-devel-azure
kernel-azure-base
kernel-azure-devel
kernel-azure-debugsource
kernel-azure-debuginfo
kernel-syms-azure
kernel-azure-base-debuginfo
dlm-kmp-default
kernel-macros
ocfs2-kmp-default-debuginfo
kernel-default-debugsource
gfs2-kmp-default-debuginfo
gfs2-kmp-default
dlm-kmp-default-debuginfo
kernel-default-base-debuginfo
kernel-default-debuginfo
kernel-default-extra-debuginfo
kernel-default-extra
kernel-default-man
kernel-obs-build-debugsource
kernel-obs-build
kernel-docs
kernel-default-kgraft
kernel-default-kgraft-devel
kernel-default-devel-debuginfo
kernel-devel
kernel-source
kernel-default-devel
kernel-default
cluster-md-kmp-default
cluster-md-kmp-default-debuginfo
ocfs2-kmp-default
kernel-syms
kernel-default-base
bpftool-debuginfo
bpftool
kernel-debuginfo
kernel-debugsource
python2-perf-debuginfo
kernel-tools-devel
kernel-tools
kernel-tools-debuginfo
python3-perf
kernel
python3-perf-debuginfo
python2-perf
perf
perf-debuginfo

Install updates from vendor's website.

Linux kernel - addressed in versions 4.4.268, 4.9.268, 4.14.232, 4.19.187, 5.4.112, 5.10.30, 5.11.14, 5.12
linux-image-virtual (Ubuntu package) - update to Ubuntu Pro (Infra-only)
linux-image-server (Ubuntu package) - update to Ubuntu Pro
linux-image-lowlatency (Ubuntu package) - update to Ubuntu Pro (Infra-only)
linux-image-generic-lts-trusty (Ubuntu package) - update to Ubuntu Pro
linux-image-generic (Ubuntu package) - update to Ubuntu Pro (Infra-only)
linux-image-3.13.0-199-lowlatency (Ubuntu package) - update to Ubuntu Pro
linux-image-3.13.0-199-generic (Ubuntu package) - update to Ubuntu Pro
kgraft-patch-4_12_14-122_212-default - update to 1-8.11.1
kernel-rt-devel - update to 4.12.14-10.182.1
gfs2-kmp-rt-debuginfo - update to 4.12.14-10.182.1
cluster-md-kmp-rt-debuginfo - update to 4.12.14-10.182.1
kernel-rt_debug-debuginfo - update to 4.12.14-10.182.1
dlm-kmp-rt - update to 4.12.14-10.182.1
ocfs2-kmp-rt - update to 4.12.14-10.182.1
kernel-rt_debug-debugsource - update to 4.12.14-10.182.1
kernel-syms-rt - update to 4.12.14-10.182.1
kernel-rt-devel-debuginfo - update to 4.12.14-10.182.1
kernel-rt-base-debuginfo - update to 4.12.14-10.182.1
kernel-rt-base - update to 4.12.14-10.182.1
kernel-rt - update to 4.12.14-10.182.1
gfs2-kmp-rt - update to 4.12.14-10.182.1
cluster-md-kmp-rt - update to 4.12.14-10.182.1
kernel-rt-debugsource - update to 4.12.14-10.182.1
kernel-rt-debuginfo - update to 4.12.14-10.182.1
dlm-kmp-rt-debuginfo - update to 4.12.14-10.182.1
ocfs2-kmp-rt-debuginfo - update to 4.12.14-10.182.1
kernel-rt_debug-devel-debuginfo - update to 4.12.14-10.182.1
kernel-rt_debug-devel - update to 4.12.14-10.182.1
kernel-devel-rt - update to 4.12.14-10.182.1
kernel-source-rt - update to 4.12.14-10.182.1
kernel-rt_debug - update to 4.12.14-10.182.1
kernel-azure - update to 4.12.14-16.182.1
kernel-source-azure - update to 4.12.14-16.182.1
kernel-devel-azure - update to 4.12.14-16.182.1
kernel-azure-base - update to 4.12.14-16.182.1
kernel-azure-devel - update to 4.12.14-16.182.1
kernel-azure-debugsource - update to 4.12.14-16.182.1
kernel-azure-debuginfo - update to 4.12.14-16.182.1
kernel-syms-azure - update to 4.12.14-16.182.1
kernel-azure-base-debuginfo - update to 4.12.14-16.182.1
dlm-kmp-default - update to 4.12.14-122.212.1
kernel-macros - update to 4.12.14-122.212.1
ocfs2-kmp-default-debuginfo - update to 4.12.14-122.212.1
kernel-default-debugsource - update to 4.12.14-122.212.1
gfs2-kmp-default-debuginfo - update to 4.12.14-122.212.1
gfs2-kmp-default - update to 4.12.14-122.212.1
dlm-kmp-default-debuginfo - update to 4.12.14-122.212.1
kernel-default-base-debuginfo - update to 4.12.14-122.212.1
kernel-default-debuginfo - update to 4.12.14-122.212.1
kernel-default-extra-debuginfo - update to 4.12.14-122.212.1
kernel-default-extra - update to 4.12.14-122.212.1
kernel-default-man - update to 4.12.14-122.212.1
kernel-obs-build-debugsource - update to 4.12.14-122.212.1
kernel-obs-build - update to 4.12.14-122.212.1
kernel-docs - update to 4.12.14-122.212.1
kernel-default-kgraft - update to 4.12.14-122.212.1
kernel-default-kgraft-devel - update to 4.12.14-122.212.1
kernel-default-devel-debuginfo - update to 4.12.14-122.212.1
kernel-devel - update to 4.12.14-122.212.1
kernel-source - update to 4.12.14-122.212.1
kernel-default-devel - update to 4.12.14-122.212.1
kernel-default - update to 4.12.14-122.212.1
cluster-md-kmp-default - update to 4.12.14-122.212.1
cluster-md-kmp-default-debuginfo - update to 4.12.14-122.212.1
ocfs2-kmp-default - update to 4.12.14-122.212.1
kernel-syms - update to 4.12.14-122.212.1
kernel-default-base - update to 4.12.14-122.212.1
bpftool-debuginfo - addressed in versions 4.19.90-2404.1.0.0245, 4.19.90-2404.1.0.0272
bpftool - addressed in versions 4.19.90-2404.1.0.0245, 4.19.90-2404.1.0.0272
kernel-debuginfo - addressed in versions 4.19.90-2404.1.0.0245, 4.19.90-2404.1.0.0272
kernel-debugsource - addressed in versions 4.19.90-2404.1.0.0245, 4.19.90-2404.1.0.0272
python2-perf-debuginfo - addressed in versions 4.19.90-2404.1.0.0245, 4.19.90-2404.1.0.0272
kernel-tools-devel - addressed in versions 4.19.90-2404.1.0.0245, 4.19.90-2404.1.0.0272
kernel-tools - addressed in versions 4.19.90-2404.1.0.0245, 4.19.90-2404.1.0.0272
kernel-tools-debuginfo - addressed in versions 4.19.90-2404.1.0.0245, 4.19.90-2404.1.0.0272
kernel-devel - addressed in versions 4.19.90-2404.1.0.0245, 4.19.90-2404.1.0.0272
python3-perf - addressed in versions 4.19.90-2404.1.0.0245, 4.19.90-2404.1.0.0272
kernel - addressed in versions 4.19.90-2404.1.0.0245, 4.19.90-2404.1.0.0272
python3-perf-debuginfo - addressed in versions 4.19.90-2404.1.0.0245, 4.19.90-2404.1.0.0272
kernel-source - addressed in versions 4.19.90-2404.1.0.0245, 4.19.90-2404.1.0.0272
python2-perf - addressed in versions 4.19.90-2404.1.0.0245, 4.19.90-2404.1.0.0272
perf - addressed in versions 4.19.90-2404.1.0.0245, 4.19.90-2404.1.0.0272
perf-debuginfo - addressed in versions 4.19.90-2404.1.0.0245, 4.19.90-2404.1.0.0272
EMC Cloud Tiering Appliance - update to 13.2.0.2.29

• https://git.kernel.org/stable/c/a462067d7c8e6953a733bf5ade8db947b1bb5449
• https://git.kernel.org/stable/c/145c89c441d27696961752bf51b323f347601bee
• https://git.kernel.org/stable/c/caf5ac93b3b5d5fac032fc11fbea680e115421b4
• https://git.kernel.org/stable/c/92028d7a31e55d53e41cff679156b9432cffcb36
• https://git.kernel.org/stable/c/4a2933c88399c0ebc738db39bbce3ae89786d723
• https://git.kernel.org/stable/c/dc195928d7e4ec7b5cfc6cd10dc4c8d87a7c72ac
• https://git.kernel.org/stable/c/388d05f70f1ee0cac4a2068fd295072f1a44152a
• https://git.kernel.org/stable/c/8a12f8836145ffe37e9c8733dce18c22fb668b66
• https://mirrors.edge.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.232
• https://mirrors.edge.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.19.187
• https://mirrors.edge.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.4.268
• https://mirrors.edge.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.9.268
• https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.30
• https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.11.14
• https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.12
• https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4.112

• Denial of service in Linux kernel usb implementation
• openEuler 20.03 LTS SP1 update for kernel
• openEuler 20.03 LTS SP4 update for kernel
• Multiple vulnerabilities in Dell Cloud Tiering Appliance
• SUSE update for the Linux Kernel
• SUSE update for the Linux Kernel
• SUSE update for the Linux Kernel
• SUSE update for the Linux Kernel
• Multiple vulnerabilities in Dell Data Protection Central
• Ubuntu update for linux