Use-after-free in Linux kernel - CVE-2020-15436

Vulnerability identifier: #VU51897

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-2020-15436

CWE-ID: CWE-416

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 due to a use-after-free error in fs/block_dev.c in the Linux kernel. A local user can run a specially crafted program to escalate privileges on the system.

Linux kernel
Red Hat Enterprise Linux for Power 9
Red Hat Enterprise Linux for IBM System z (Structure A)
Red Hat Enterprise Linux Server
Red Hat Enterprise Linux Workstation
Red Hat Enterprise Linux Desktop
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, big endian
Red Hat Enterprise Linux for Scientific Computing
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for Real Time
Red Hat Enterprise Linux for Real Time for NFV
Anolis OS
Red Hat Enterprise Linux for Power, big endian - Extended Update Support
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Red Hat Enterprise Linux EUS Compute Node
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux Server - TUS
Red Hat Enterprise Linux for x86_64 - Extended Update Support
openEuler
Ubuntu
Google Android
kernel (Red Hat package)
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
Red Hat Enterprise Linux Server for x86_64 - Update Services for SAP Solutions
kernel-rt (Red Hat package)
kernel-alt (Red Hat package)
kernel
kernel-debuginfo
kernel-debugsource
kernel-devel
kernel-source
kernel-tools
kernel-tools-debuginfo
kernel-tools-devel
perf
perf-debuginfo
python2-perf
python2-perf-debuginfo
python3-perf
python3-perf-debuginfo
bpftool
bpftool-debuginfo
kernel-debug
kernel-debug-devel
kernel-headers
kernel-tools-libs
kernel-tools-libs-devel
python-perf
linux-image-oem-20.04 (Ubuntu package)
linux-image-5.6.0-1048-oem (Ubuntu package)
Red Hat Advanced Cluster Management for Kubernetes
Data Computing Appliance (DCA)
IBM QRadar Network Security

Install updates from vendor's website.

Linux kernel - update to 5.8.0
kernel (Red Hat package) - addressed in versions 3.10.0-957.72.1.el7, 3.10.0-1062.51.1.el7, 3.10.0-1160.15.2.el7
Red Hat Advanced Cluster Management for Kubernetes - addressed in versions 2.0.8, 2.1.3
kernel-rt (Red Hat package) - update to 3.10.0-1160.15.2.rt56.1152.el7
Data Computing Appliance (DCA) - update to 4.3.0.0
kernel-alt (Red Hat package) - update to 4.14.0-115.35.1.el7a
kernel - update to 4.19.90-2010.2.0.0046
kernel-debuginfo - update to 4.19.90-2010.2.0.0046
kernel-debugsource - update to 4.19.90-2010.2.0.0046
kernel-devel - update to 4.19.90-2010.2.0.0046
kernel-source - update to 4.19.90-2010.2.0.0046
kernel-tools - update to 4.19.90-2010.2.0.0046
kernel-tools-debuginfo - update to 4.19.90-2010.2.0.0046
kernel-tools-devel - update to 4.19.90-2010.2.0.0046
perf - update to 4.19.90-2010.2.0.0046
perf-debuginfo - update to 4.19.90-2010.2.0.0046
python2-perf - update to 4.19.90-2010.2.0.0046
python2-perf-debuginfo - update to 4.19.90-2010.2.0.0046
python3-perf - update to 4.19.90-2010.2.0.0046
python3-perf-debuginfo - update to 4.19.90-2010.2.0.0046
bpftool - update to 4.19.90-2010.2.0.0046
bpftool-debuginfo - update to 4.19.90-2010.2.0.0046
kernel-tools - update to 4.19.91-26
perf - update to 4.19.91-26
bpftool - update to 4.19.91-26
kernel - update to 4.19.91-26
kernel-debug - update to 4.19.91-26
kernel-debug-devel - update to 4.19.91-26
kernel-devel - update to 4.19.91-26
kernel-headers - update to 4.19.91-26
kernel-tools-libs - update to 4.19.91-26
kernel-tools-libs-devel - update to 4.19.91-26
python-perf - update to 4.19.91-26
IBM QRadar Network Security - addressed in versions 5.4.0.17, 5.5.0.12
linux-image-oem-20.04 (Ubuntu package) - update to 5.6.0.1048.44
linux-image-5.6.0-1048-oem (Ubuntu package) - update to 5.6.0-1048.52
Google Android - addressed in versions 9.0 2021-04-05, 10 2021-04-05, 11 2021-04-05

• https://lkml.org/lkml/2020/6/7/379
• https://security.netapp.com/advisory/ntap-20201218-0002/

• Use-after-free in Linux kernel
• Multiple vulnerabilities in Google Android
• Red Hat Enterprise Linux 7.6 update for kernel
• Red Hat Enterprise Linux 7.7 update for kernel
• Multiple vulnerabilities in Dell EMC Data Computing Appliance (DCA)
• Multiple vulnerabilities in IBM QRadar Network Security
• Red Hat Enterprise Linux 7 update for kernel-alt
• Red Hat Enterprise Linux 7 update for kernel
• Red Hat Enterprise Linux 7 update for kernel-rt
• Multiple vulnerabilities in Red Hat Advanced Cluster Management for Kubernetes 2.1
• Multiple vulnerabilities in Red Hat Advanced Cluster Management for Kubernetes 2.0
• Ubuntu update for linux-oem-5.6
• Anolis OS update for kernel(ANCK)4.19
• openEuler 20.03 LTS update for kernel