Information disclosure in Linux kernel - CVE-2017-15537
Published: April 30, 2018 / Updated: May 1, 2018
Vulnerability identifier: #VU12315
CSH Severity: Low
CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2017-15537
CWE-ID: CWE-200
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local attacker to obtain potentially sensitive information.
The weakness exists in the x86/fpu (Floating Point Unit) subsystem due to incorrect handling of attempts to set reserved bits in the xstate header via the ptrace() or rt_sigreturn() system call when a processor supports the xsave feature but not the xsaves feature. A local attacker can read the FPU registers of other processes on the system, related to arch/x86/kernel/fpu/regset.c and arch/x86/kernel/fpu/signal.c.
Affected software
Linux kernel
Ubuntu
linux (Ubuntu package)
linux-aws (Ubuntu package)
linux-kvm (Ubuntu package)
linux-gke (Ubuntu package)
linux-snapdragon (Ubuntu package)
Ubuntu
linux (Ubuntu package)
linux-aws (Ubuntu package)
linux-kvm (Ubuntu package)
linux-gke (Ubuntu package)
linux-snapdragon (Ubuntu package)
How to mitigate CVE-2017-15537
Update to version 4.13.5.
linux (Ubuntu package) - update to 4.4.0-98.121
linux-aws (Ubuntu package) - update to 4.4.0-1039.48
linux-kvm (Ubuntu package) - update to 4.4.0-1009.14
linux-gke (Ubuntu package) - update to 4.4.0-1033.33
linux-snapdragon (Ubuntu package) - update to 4.4.0-1078.83
linux-aws (Ubuntu package) - update to 4.4.0-1039.48
linux-kvm (Ubuntu package) - update to 4.4.0-1009.14
linux-gke (Ubuntu package) - update to 4.4.0-1033.33
linux-snapdragon (Ubuntu package) - update to 4.4.0-1078.83