CVE-2016-9644

Description

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.

CVSS Metrics

• v3.0•HIGH•Score: 7.8CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
• v2.0•HIGH•Score: 9.3AV:N/AC:M/Au:N/C:C/I:C/A:C

EPSS Trends

Current EPSS score: 0.17%• Percentile: 38%

Techniques & Countermeasures

• CWE-264•Permissions, Privileges, and Access Controls

  Weaknesses in this category are related to the management of permissions, privileges, and other security features that are used to perform access control.

Affected Systems

• linux•linux_kernel

  4.4.22 | 4.4.23 | 4.4.24 | 4.4.25 | 4.4.26 | 4.4.27 | 4.4.28

References (5)

• http://www.ubuntu.com/usn/USN-3146-2
• http://www.securityfocus.com/bid/94545
• http://www.ubuntu.com/usn/USN-3146-1
• http://www.openwall.com/lists/oss-security/2016/11/07/4
• https://lwn.net/Articles/705220/