Use-after-free in Linux kernel - CVE-2019-7221

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Main Vulnerability Database Vulnerabilities #VU17760

Use-after-free in Linux kernel - CVE-2019-7221

Published: February 19, 2019 / Updated: May 30, 2020


Vulnerability identifier: #VU17760
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2019-7221
CWE-ID: CWE-416
Exploitation vector: Adjecent network
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows an adjacent attacker to cause DoS condition or execute arbitrary code.

The weakness exists due to exists due to use-after-free error when using emulated vmx preemption timer. An adjacent attacker can cause the service to crash or execute arbitrary code with elevated privileges.

Affected software

Linux kernel
Amazon Linux AMI
Red Hat Enterprise Linux for Real Time
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 for Power, little endian
Red Hat Enterprise Linux Server
Red Hat Enterprise Linux for Real Time for NFV
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux Server - TUS
Red Hat Enterprise Linux for x86_64 - Extended Update Support
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Red Hat Enterprise Linux for Power, big endian - Extended Update Support
Red Hat Enterprise Linux EUS Compute Node
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux Server - Extended Update Support
Opensuse
Fedora

kernel (Red Hat package)
Red Hat Enterprise Linux Server for x86_64 - Update Services for SAP Solutions
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
kernel-rt (Red Hat package)
kernel
kernel-headers
kernel-tools
Red Hat Virtualization Host

How to mitigate CVE-2019-7221

The vulnerability has been addressed in the versions 4.9.156, 4.14.99, 4.19.21, 4.20.8.

Linux kernel - addressed in versions 4.4.175, 4.9.156, 4.14.99, 4.19.21, 4.20.8
kernel (Red Hat package) - addressed in versions 3.10.0-693.61.1.el7, 3.10.0-862.44.2.el7, 3.10.0-957.12.1.el7
kernel-rt (Red Hat package) - update to 3.10.0-957.12.1.rt56.927.el7
kernel - addressed in versions 4.20.8-100.fc28, 4.20.8-200.fc29
kernel-headers - addressed in versions 4.20.8-100.fc28, 4.20.8-200.fc29
kernel-tools - addressed in versions 4.20.8-100.fc28, 4.20.8-200.fc29

External References

Related Security Bulletins