Information disclosure in Linux kernel - CVE-2019-18660

Vulnerability identifier: #VU23082

CSH Severity: Low

CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2019-18660

CWE-ID: CWE-200

Exploitation vector: Local access

Exploit availability: No public exploit available

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

The vulnerability exists due to absent protection in Linux kernel on powerpc against the Spectre-RSB, related to arch/powerpc/kernel/entry_64.S and arch/powerpc/kernel/security.c. A local user can gain unauthorized access to sensitive information on the system.

Linux kernel
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for Power 9
Red Hat Enterprise Linux for IBM System z (Structure A)
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 Server - AUS
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux Server - TUS
Red Hat Virtualization Host - Extended Update Support 4.2 for RHEL
Red Hat CodeReady Linux Builder for ARM 64
Red Hat CodeReady Linux Builder for Power, little endian
Red Hat CodeReady Linux Builder for x86_64
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for ARM 64 - Extended Update Support
Red Hat CodeReady Linux Builder for ARM 64 - Extended Update Support
Red Hat CodeReady Linux Builder for Power, little endian - Extended Update Support
Red Hat CodeReady Linux Builder for x86_64 - Extended Update Support
Slackware Linux
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-alt (Red Hat package)
kernel

Install update from vendor's website.

Linux kernel - addressed in versions 4.4.204, 4.9.204, 4.14.157, 4.19.87, 5.5
kernel (Red Hat package) - addressed in versions 2.6.32-754.31.1.el6, 3.10.0-957.56.1.el7, 3.10.0-1062.21.1.el7, 4.18.0-80.23.2.el8_0, 4.18.0-147.8.1.el8_1
kernel-alt (Red Hat package) - update to 4.14.0-115.17.1.el7a
kernel - addressed in versions 5.3.14-200.fc30, 5.3.14-300.fc31

• https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.4.204
• https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.9.204
• https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.19.87
• https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.157
• https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4.1
• https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.3.14
• https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.5

• Information disclosure in Linux kernel on powerpc
• Red Hat Enterprise Linux 7 update for kernel
• Red Hat Enterprise Linux 8 update for kernel
• Red Hat Enterprise Linux 6 update for kernel
• Slackware Linux update for Slackware 14.2 kernel
• Red Hat Enterprise Linux 7 update for kernel-alt
• Red Hat Enterprise Linux 8 update for kernel
• Red Hat Enterprise Linux 7.6 Extended Update Support update for kernel
• Fedora 31 update for kernel
• Fedora 30 update for kernel