Buffer over-read in Linux kernel - CVE-2018-16658

Vulnerability identifier: #VU15486

CSH Severity: Low

CVSS v4: 5.1 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2018-16658

CWE-ID: CWE-125

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 a boundary condition in cdrom_ioctl_drive_status() function in drivers/cdrom/cdrom.c. A local unprivileged user can create a specially crafted application, trigger out-of-bounds read error and read contents of kernel memory.

Linux kernel
Amazon Linux AMI
Red Hat Enterprise Linux for IBM System z (Structure A)
Red Hat Enterprise Linux for Power 9
Red Hat Enterprise Linux for ARM 64
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 for NFV
Red Hat Enterprise Linux for Real Time
Opensuse
Fedora

kernel (Red Hat package)
kernel-rt (Red Hat package)
kernel-alt (Red Hat package)
kernel
kernel-headers
kernel-tools
Red Hat Virtualization Host

Install updates from vendor's website.

Linux kernel - addressed in versions 4.2, 4.4.164, 4.9.138, 4.14.82, 4.18.20, 4.19.3
kernel (Red Hat package) - update to 3.10.0-1062.el7
kernel-rt (Red Hat package) - update to 3.10.0-1062.rt56.1022.el7
kernel-alt (Red Hat package) - update to 4.14.0-115.16.1.el7a
kernel - update to 4.18.7-200.fc28
kernel-headers - update to 4.18.7-200.fc28
kernel-tools - update to 4.18.7-200.fc28

• https://github.com/torvalds/linux/commit/8f3fafc9c2f0ece10832c25f7ffcb07c97a32ad4
• https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.18.6
• https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.20
• https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.9.138
• https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.4.164
• https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.19.3
• https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.18.20
• https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.82

• Amazon Linux AMI update for kernel
• OpenSUSE Linux update for the Linux Kernel
• OpenSUSE Linux update for the Linux Kernel
• Red Hat update for kernel-rt
• Red Hat update for kernel
• Red Hat update for kernel-alt
• Fedora 28 update for kernel, kernel-headers, kernel-tools