Information disclosure in Linux kernel - CVE-2017-1000380

Vulnerability identifier: #VU9478

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-2017-1000380

CWE-ID: CWE-362

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local attacker to obtain potentially sensitive information.

The vulnerability exists in the sound/core/timer.c code due to a race condition that exists in the timing functionality of the ALSA/dev/snd/timer driver when a read and an ioctl system call happens simultaneously. A local attacker can cause uninitialized memory from the kernel heap to be copied to user space and read kernel-space memory.

Linux kernel
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux Desktop
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 Workstation
Red Hat Enterprise Linux for Real Time for NFV
Red Hat Enterprise Linux for Real Time
Red Hat Enterprise Linux Server
Red Hat Enterprise Linux for Power, big endian - Extended Update Support
Red Hat Enterprise Linux Server - Extended Update Support
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Red Hat Enterprise Linux Server - 4 Year Extended Update Support
Red Hat Enterprise Linux Server (for IBM Power LE) - 4 Year Extended Update Support
Red Hat Enterprise Linux Server - TUS
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux EUS Compute Node
SUSE Linux

MRG Realtime
kernel (Red Hat package)
kernel-rt (Red Hat package)
Red Hat Virtualization Host

Update to version 4.11.5.

kernel (Red Hat package) - update to 3.10.0-693.11.1.el7
kernel-rt (Red Hat package) - addressed in versions 3.10.0-693.11.1.rt56.597.el6rt, 3.10.0-693.11.1.rt56.632.el7

• https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.11.5

• Information disclosure in Linux Kernel
• OpenSUSE Linux update for the Linux Kernel
• Red Hat update for kernel-rt
• Red Hat update for kernel-rt
• Red Hat update for kernel
• SUSE Linux update for the Linux Kernel