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CVE-2016-9644

Status Candidate

Overview

The __get_user_asm_ex macro in arch/x86/include/asm/uaccess.h in the Linux kernel 4.4.22 through 4.4.28 contains extended asm statements that are incompatible with the exception table, which allows local users to obtain root access on non-SMEP platforms via a crafted application. NOTE: this vulnerability exists because of incorrect backporting of the CVE-2016-9178 patch to older kernels.

Related Files

Ubuntu Security Notice USN-3161-4
Posted Dec 20, 2016
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3161-4 - Tilman Schmidt and Sasha Levin discovered a use-after-free condition in the TTY implementation in the Linux kernel. A local attacker could use this to expose sensitive information. It was discovered that the Video For Linux Two implementation in the Linux kernel did not properly handle multiple planes when processing a VIDIOC_DQBUF ioctl. A local attacker could use this to cause a denial of service or possibly execute arbitrary code. Various other issues were also addressed.

tags | advisory, denial of service, arbitrary, kernel, local
systems | linux, ubuntu
advisories | CVE-2015-8964, CVE-2016-4568, CVE-2016-6213, CVE-2016-7097, CVE-2016-7425, CVE-2016-8630, CVE-2016-8633, CVE-2016-8645, CVE-2016-8658, CVE-2016-9555, CVE-2016-9644
SHA-256 | 09cffad9b41759532941fa035fb7aeb597e6fa782bb0de514b160c4fbc83e328
Ubuntu Security Notice USN-3146-2
Posted Nov 30, 2016
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3146-2 - USN-3146-1 fixed vulnerabilities in the Linux kernel for Ubuntu 16.04 LTS. This update provides the corresponding updates for the Linux Hardware Enablement kernel from Ubuntu 16.04 LTS for Ubuntu 14.04 LTS. It was discovered that the __get_user_asm_ex implementation in the Linux kernel for x86/x86_64 contained extended asm statements that were incompatible with the exception table. A local attacker could use this to gain administrative privileges. Various other issues were also addressed.

tags | advisory, x86, kernel, local, vulnerability
systems | linux, ubuntu
advisories | CVE-2016-7097, CVE-2016-7425, CVE-2016-8658, CVE-2016-9644
SHA-256 | f19373773609e5f45ffaa3056bccfff36fc9074e721afb3c23140514cba33613
Ubuntu Security Notice USN-3146-1
Posted Nov 30, 2016
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3146-1 - It was discovered that the __get_user_asm_ex implementation in the Linux kernel for x86/x86_64 contained extended asm statements that were incompatible with the exception table. A local attacker could use this to gain administrative privileges. Andreas Gruenbacher and Jan Kara discovered that the filesystem implementation in the Linux kernel did not clear the setgid bit during a setxattr call. A local attacker could use this to possibly elevate group privileges. Various other issues were also addressed.

tags | advisory, x86, kernel, local
systems | linux, ubuntu
advisories | CVE-2016-7097, CVE-2016-7425, CVE-2016-8658, CVE-2016-9644
SHA-256 | 866d7bda3219cca441808b8427f774eec5e84f72709d3a29611f6b9bc47b4ee1
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