Vulnerability Name:

CVE-2016-9806

Assigned:2016-12-04
Published:2016-05-15
Updated:2018-01-04
Summary:Race condition in the netlink_dump function in net/netlink/af_netlink.c in the Linux kernel before 4.6.3 allows local users to cause a denial of service (double free) or possibly have unspecified other impact via a crafted application that makes sendmsg system calls, leading to a free operation associated with a new dump that started earlier than anticipated.
CVSS v3 Severity:7.8 High (CVSS v3 Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
6.8 Medium (Temporal CVSS v3 Vector: CVSS:3.0/AV:L/AC:L/PR:L/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): Low
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): High
Integrity (I): High
Availibility (A): High
7.8 High (CCN CVSS v3 Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
6.8 Medium (CCN Temporal CVSS v3 Vector: CVSS:3.0/AV:L/AC:L/PR:L/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): Low
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): High
Integrity (I): High
Availibility (A): High
7.8 High (REDHAT CVSS v3 Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
6.8 Medium (REDHAT Temporal CVSS v3 Vector: CVSS:3.0/AV:L/AC:L/PR:L/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): Low
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): High
Integrity (I): High
Availibility (A): High
CVSS v2 Severity:7.2 High (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
Authentication (Au): None
Impact Metrics:Confidentiality (C): Complete
Integrity (I): Complete
Availibility (A): Complete
6.8 Medium (CCN CVSS v2 Vector: AV:L/AC:L/Au:S/C:C/I:C/A:C)
Exploitability Metrics:Access Vector (AV): Local
Access Complexity (AC): Low
Athentication (Au): Single_Instance
Impact Metrics:Confidentiality (C): Complete
Integrity (I): Complete
Availibility (A): Complete
6.9 Medium (REDHAT CVSS v2 Vector: AV:L/AC:M/Au:N/C:C/I:C/A:C)
Exploitability Metrics:Access Vector (AV): Local
Access Complexity (AC): Medium
Authentication (Au): None
Impact Metrics:Confidentiality (C): Complete
Integrity (I): Complete
Availibility (A): Complete
Vulnerability Type:CWE-362
CWE-416
References:Source: CONFIRM
Type: VENDOR_ADVISORY
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=92964c79b357efd980812c4de5c1fd2ec8bb5520

Source: MLIST
Type: UNKNOWN
[netdev] 20160515 BUG: use-after-free in netlink_dump

Source: CONFIRM
Type: UNKNOWN
http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.6.3

Source: MLIST
Type: PATCH
[oss-security] 20161203 CVE Request: -- Linux kernel: double free in netlink_dump

Source: BID
Type: UNKNOWN
94653

Source: SECTRACK
Type: UNKNOWN
1037968

Source: REDHAT
Type: UNKNOWN
RHSA-2017:1842

Source: REDHAT
Type: UNKNOWN
RHSA-2017:2077

Source: REDHAT
Type: UNKNOWN
RHSA-2017:2669

Source: CONFIRM
Type: PATCH
https://bugzilla.redhat.com/show_bug.cgi?id=1401502

Source: XF
Type: UNKNOWN
linux-kernel-cve20169806-dos(120228)

Source: CONFIRM
Type: PATCH
https://github.com/torvalds/linux/commit/92964c79b357efd980812c4de5c1fd2ec8bb5520

Source: CONFIRM
Type: UNKNOWN
https://source.android.com/security/bulletin/2017-03-01.html

Vulnerable Configuration:Configuration 1:
  • cpe:/o:linux:linux_kernel:4.6.2:*:*:*:*:*:*:*

  • Configuration RedHat 1:
  • cpe:/o:redhat:enterprise_linux:7:*:*:*:*:*:*:*

  • Configuration RedHat 2:
  • cpe:/a:redhat:rhel_extras_rt:7:*:*:*:*:*:*:*

  • Configuration CCN 1:
  • cpe:/o:linux:linux_kernel:4.6.2:*:*:*:*:*:*:*

  • Denotes that component is vulnerable
    Oval Definitions
    Definition IDClassTitleLast Modified
    oval:org.opensuse.security:def:20169806
    V
    CVE-2016-9806
    2018-01-23
    oval:com.redhat.rhsa:def:20171842
    P
    RHSA-2017:1842: kernel security, bug fix, and enhancement update (Important)
    2017-08-01
    oval:com.redhat.rhsa:def:20172077
    P
    RHSA-2017:2077: kernel-rt security, bug fix, and enhancement update (Important)
    2017-08-01
    oval:com.ubuntu.xenial:def:20169806000
    V
    CVE-2016-9806 on Ubuntu 16.04 LTS (xenial) - medium.
    2016-12-28
    oval:com.ubuntu.precise:def:20169806000
    V
    CVE-2016-9806 on Ubuntu 12.04 LTS (precise) - medium.
    2016-12-28
    oval:com.ubuntu.trusty:def:20169806000
    V
    CVE-2016-9806 on Ubuntu 14.04 LTS (trusty) - medium.
    2016-12-28
    BACK
    linux linux_kernel 4.6.2
    redhat enterprise_linux 7
    redhat rhel_extras_rt 7