Race condition in Linux kernel - CVE-2019-3016

Vulnerability identifier: #VU28411

CSH Severity: Low

CVSS v4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2019-3016

CWE-ID: CWE-362

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local authenticated user to gain access to sensitive information.

In a Linux KVM guest that has PV TLB enabled, a process in the guest kernel may be able to read memory locations from another process in the same guest. This problem is limit to the host running linux kernel 4.10 with a guest running linux kernel 4.16 or later. The problem mainly affects AMD processors but Intel CPUs cannot be ruled out.

Linux kernel
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for Power, little endian
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
Red Hat Enterprise Linux for Real Time
Red Hat Enterprise Linux for Real Time for NFV
Red Hat Enterprise Linux for x86_64 - Extended Update Support
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux Server - TUS
Red Hat Enterprise Linux for ARM 64 - Extended Update Support
kernel (Red Hat package)
kernel-rt (Red Hat package)

Install update from vendor's website.

Linux kernel - addressed in versions 4.19.119, 5.6
kernel (Red Hat package) - update to 4.18.0-193.13.2.el8_2
kernel-rt (Red Hat package) - update to 4.18.0-193.13.2.rt13.65.el8_2

• https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.19.103
• https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4.19
• https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.5.3
• https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.6
• https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.19.119

• Race condition in Linux kernel
• Red Hat Enterprise Linux 8 update for kernel
• Red Hat Enterprise Linux 8 update for kernel-rt