Use-after-free in Linux kernel - CVE-2020-8648

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Main Vulnerability Database Vulnerabilities #VU28416

Use-after-free in Linux kernel - CVE-2020-8648

Published: February 6, 2020 / Updated: June 1, 2020


Vulnerability identifier: #VU28416
CSH Severity: Low
CVSS v4: 6.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2020-8648
CWE-ID: CWE-416
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a local authenticated user to #BASIC_IMPACT#.

There is a use-after-free vulnerability in the Linux kernel through 5.5.2 in the n_tty_receive_buf_common function in drivers/tty/n_tty.c.


Affected software

Linux kernel
Amazon Linux AMI
Anolis OS
CentOS
Red Hat Enterprise Linux for Real Time for NFV
Red Hat Enterprise Linux for Real Time
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for Scientific Computing
Red Hat Enterprise Linux for Power, big endian
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux Desktop
Red Hat Enterprise Linux Workstation
Red Hat Enterprise Linux Server
Red Hat Enterprise Linux Server - TUS
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for ARM 64
Red Hat CodeReady Linux Builder for x86_64
Red Hat CodeReady Linux Builder for Power, little endian
Red Hat CodeReady Linux Builder for ARM 64
Slackware Linux
kernel (Red Hat package)
kernel-rt (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
linux-4.4.217/kernel-modules
linux-4.4.217/kernel-huge
linux-4.4.217/kernel-generic
linux-4.4.217/kernel-headers
kernel-core
bpftool
kernel
python3-perf
perf
kernel-tools-libs-devel
kernel-tools-libs
kernel-tools
kernel-modules-extra
kernel-modules
kernel-headers
kernel-devel
kernel-debug-modules-extra
kernel-debug-modules
kernel-debug-devel
kernel-debug-core
kernel-debug
python-perf
IBM QRadar Network Security
Session Smart Router

How to mitigate CVE-2020-8648

Install update from vendor's website.

Linux kernel - addressed in versions 4.4.216, 4.9.216, 4.14.173, 4.19.109, 5.6
kernel (Red Hat package) - addressed in versions 3.10.0-957.80.1.el7, 3.10.0-1062.56.1.el7, 3.10.0-1160.31.1.el7, 4.18.0-240.el8
kernel-rt (Red Hat package) - update to 3.10.0-1160.31.1.rt56.1169.el7
linux-4.4.217/kernel-modules - update to 4.4.217
linux-4.4.217/kernel-huge - update to 4.4.217
linux-4.4.217/kernel-generic - update to 4.4.217
linux-4.4.217/kernel-headers - update to 4.4.217_smp
kernel-core - update to 4.19.91-23.4
bpftool - addressed in versions 4.19.91-23.4, 4.19.91-26
kernel - addressed in versions 4.19.91-23.4, 4.19.91-26
python3-perf - update to 4.19.91-23.4
perf - addressed in versions 4.19.91-23.4, 4.19.91-26
kernel-tools-libs-devel - addressed in versions 4.19.91-23.4, 4.19.91-26
kernel-tools-libs - addressed in versions 4.19.91-23.4, 4.19.91-26
kernel-tools - addressed in versions 4.19.91-23.4, 4.19.91-26
kernel-modules-extra - update to 4.19.91-23.4
kernel-modules - update to 4.19.91-23.4
kernel-headers - addressed in versions 4.19.91-23.4, 4.19.91-26
kernel-devel - addressed in versions 4.19.91-23.4, 4.19.91-26
kernel-debug-modules-extra - update to 4.19.91-23.4
kernel-debug-modules - update to 4.19.91-23.4
kernel-debug-devel - addressed in versions 4.19.91-23.4, 4.19.91-26
kernel-debug-core - update to 4.19.91-23.4
kernel-debug - addressed in versions 4.19.91-23.4, 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
Session Smart Router - addressed in versions 5.4.7, 5.5.3

External References

Related Security Bulletins