Permissions, Privileges, and Access Controls - CVE-2016-3157
Published: April 12, 2016 / Updated: August 3, 2020
Vulnerability identifier: #VU33073
CSH Severity: Low
CVSS v4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2016-3157
CWE-ID: CWE-264
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local authenticated user to execute arbitrary code.
The __switch_to function in arch/x86/kernel/process_64.c in the Linux kernel does not properly context-switch IOPL on 64-bit PV Xen guests, which allows local guest OS users to gain privileges, cause a denial of service (guest OS crash), or obtain sensitive information by leveraging I/O port access.
Affected software
imlib2 (Alpine package)
linux-vanilla (Alpine package)
linux-grsec (Alpine package)
kernel
Fedora
linux-vanilla (Alpine package)
linux-grsec (Alpine package)
kernel
Fedora
How to mitigate CVE-2016-3157
Install update from vendor's website.
imlib2 (Alpine package) - addressed in versions 1.4.7-r0, 1.4.7-r1
kernel - addressed in versions 4.4.6-201.fc22, 4.4.6-301.fc23
kernel - addressed in versions 4.4.6-201.fc22, 4.4.6-301.fc23
External References
- http://www.debian.org/security/2016/dsa-3607
- http://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html
- http://www.securityfocus.com/bid/84594
- http://www.securitytracker.com/id/1035308
- http://www.ubuntu.com/usn/USN-2968-1
- http://www.ubuntu.com/usn/USN-2968-2
- http://www.ubuntu.com/usn/USN-2969-1
- http://www.ubuntu.com/usn/USN-2970-1
- http://www.ubuntu.com/usn/USN-2971-1
- http://www.ubuntu.com/usn/USN-2971-2
- http://www.ubuntu.com/usn/USN-2971-3
- http://www.ubuntu.com/usn/USN-2996-1
- http://www.ubuntu.com/usn/USN-2997-1
- http://xenbits.xen.org/xsa/advisory-171.html