Vulnerability Name:

CVE-2016-9644 (CCN-119222)

Assigned:2016-11-07
Published:2016-11-07
Updated:2017-01-07
Summary: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 v3 Severity:7.8 High (CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H)
6.8 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): Required
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): High
Integrity (I): High
Availibility (A): High
8.4 High (CCN CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
7.3 High (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): High
Integrity (I): High
Availibility (A): High
CVSS v2 Severity:9.3 High (CVSS v2 Vector: AV:N/AC:M/Au:N/C:C/I:C/A:C)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Medium
Authentication (Au): None
Impact Metrics:Confidentiality (C): Complete
Integrity (I): Complete
Availibility (A): Complete
7.2 High (CCN CVSS v2 Vector: AV:L/AC:L/Au:N/C:C/I:C/A:C)
Exploitability Metrics:Access Vector (AV): Local
Access Complexity (AC): Low
Athentication (Au): None
Impact Metrics:Confidentiality (C): Complete
Integrity (I): Complete
Availibility (A): Complete
Vulnerability Type:CWE-264
Vulnerability Consequences:Gain Privileges
References:Source: MITRE
Type: CNA
CVE-2016-9644

Source: CCN
Type: oss-sec Mailing List, Mon, 7 Nov 2016 13:48:54 +0100
Re: kernel: fix minor infoleak in get_user_ex()

Source: MLIST
Type: Mailing List, Third Party Advisory
[oss-security] 20161107 Re: Re: kernel: fix minor infoleak in get_user_ex()

Source: BID
Type: UNKNOWN
94545

Source: CCN
Type: BID-94545
Linux Kernel CVE-2016-9644 Local Privilege Escalation Vulnerability

Source: UBUNTU
Type: UNKNOWN
USN-3146-1

Source: UBUNTU
Type: UNKNOWN
USN-3146-2

Source: XF
Type: UNKNOWN
linux-kernel-cve20169644-priv-esc(119222)

Source: CCN
Type: Linux Kernel GIT Repository
fix minor infoleak in get_user_ex()

Source: CONFIRM
Type: Product
https://lwn.net/Articles/705220/

Source: CCN
Type: WhiteSource Vulnerability Database
CVE-2016-9644

Vulnerable Configuration:Configuration 1:
  • cpe:/o:linux:linux_kernel:4.4.22:*:*:*:*:*:*:*
  • OR cpe:/o:linux:linux_kernel:4.4.23:*:*:*:*:*:*:*
  • OR cpe:/o:linux:linux_kernel:4.4.24:*:*:*:*:*:*:*
  • OR cpe:/o:linux:linux_kernel:4.4.25:*:*:*:*:*:*:*
  • OR cpe:/o:linux:linux_kernel:4.4.26:*:*:*:*:*:*:*
  • OR cpe:/o:linux:linux_kernel:4.4.27:*:*:*:*:*:*:*
  • OR cpe:/o:linux:linux_kernel:4.4.28:*:*:*:*:*:*:*

    • Configuration CCN 1:
  • cpe:/o:linux:linux_kernel:4.4.22:*:*:*:*:*:*:*
  • OR cpe:/o:linux:linux_kernel:4.4.28:*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    Oval Definitions
    Definition IDClassTitleLast Modified
    oval:com.ubuntu.xenial:def:201696440000000
    V
    		CVE-2016-9644 on Ubuntu 16.04 LTS (xenial) - medium.
    2016-11-28
    oval:com.ubuntu.precise:def:20169644000
    V
    		CVE-2016-9644 on Ubuntu 12.04 LTS (precise) - medium.
    2016-11-27
    oval:com.ubuntu.trusty:def:20169644000
    V
    		CVE-2016-9644 on Ubuntu 14.04 LTS (trusty) - medium.
    2016-11-27
    oval:com.ubuntu.xenial:def:20169644000
    V
    		CVE-2016-9644 on Ubuntu 16.04 LTS (xenial) - medium.
    2016-11-27
    BACK
    linux linux kernel 4.4.22
    linux linux kernel 4.4.23
    linux linux kernel 4.4.24
    linux linux kernel 4.4.25
    linux linux kernel 4.4.26
    linux linux kernel 4.4.27
    linux linux kernel 4.4.28
    linux linux kernel 4.4.22
    linux linux kernel 4.4.28