Vulnerability Name:

CVE-2017-15126 (CCN-137626)

Assigned:2017-10-03
Published:2017-10-03
Updated:2023-02-12
Summary:A use-after-free flaw was found in fs/userfaultfd.c in the Linux kernel before 4.13.6. The issue is related to the handling of fork failure when dealing with event messages. Failure to fork correctly can lead to a situation where a fork event will be removed from an already freed list of events with userfaultfd_ctx_put().
CVSS v3 Severity:8.1 High (CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H)
7.1 High (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): High
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): High
Integrity (I): High
Availibility (A): High
5.3 Medium (CCN CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L)
4.6 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Low
7.0 High (REDHAT CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H)
6.1 Medium (REDHAT Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:H/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): High
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: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
5.0 Medium (CCN CVSS v2 Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P)
Exploitability Metrics:Access Vector (AV): Network
Access Complexity (AC): Low
Athentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Partial
Vulnerability Type:CWE-119
Vulnerability Consequences:Denial of Service
References:Source: MITRE
Type: CNA
CVE-2017-15126

Source: secalert@redhat.com
Type: Vendor Advisory
secalert@redhat.com

Source: CCN
Type: IBM Security Bulletin 715699 (QRadar Network Security)
IBM QRadar Network Security is affected by Linux kernel vulnerabilities

Source: CCN
Type: IBM Security Bulletin 725841 (Power HMC)
Vulnerabilities in Kernel affect Power Hardware Management Console

Source: CCN
Type: BID-102516
Linux Kernel 'fs/userfaultfd.c' Local Use After Free Memory Corruption Vulnerability

Source: secalert@redhat.com
Type: Third Party Advisory, VDB Entry
secalert@redhat.com

Source: secalert@redhat.com
Type: Third Party Advisory
secalert@redhat.com

Source: secalert@redhat.com
Type: Third Party Advisory
secalert@redhat.com

Source: secalert@redhat.com
Type: Third Party Advisory
secalert@redhat.com

Source: secalert@redhat.com
Type: Issue Tracking, Third Party Advisory
secalert@redhat.com

Source: XF
Type: UNKNOWN
linux-kernel-cve201715126-dos(137626)

Source: CCN
Type: Linux Kernel GIT Repository
userfaultfd: non-cooperative: fix fork use after free

Source: secalert@redhat.com
Type: Third Party Advisory
secalert@redhat.com

Source: secalert@redhat.com
Type: Vendor Advisory
secalert@redhat.com

Vulnerable Configuration:Configuration RedHat 1:
  • cpe:/a:redhat:rhel_extras_rt:7:*:*:*:*:*:*:*
    • Configuration RedHat 2:
  • cpe:/o:redhat:enterprise_linux:7:*:*:*:*:*:*:*
    • Configuration RedHat 3:
  • cpe:/o:redhat:enterprise_linux:7::client:*:*:*:*:*
    • Configuration RedHat 4:
  • cpe:/o:redhat:enterprise_linux:7::computenode:*:*:*:*:*
    • Configuration RedHat 5:
  • cpe:/o:redhat:enterprise_linux:7::server:*:*:*:*:*
    • Configuration RedHat 6:
  • cpe:/o:redhat:enterprise_linux:7::workstation:*:*:*:*:*

    • Configuration CCN 1:
  • cpe:/o:linux:linux_kernel:4.13.5:*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    Oval Definitions
    Definition IDClassTitleLast Modified
    oval:com.redhat.rhsa:def:20180676
    P
    		RHSA-2018:0676: kernel-rt security, bug fix, and enhancement update (Important)
    2018-04-10
    oval:com.redhat.rhsa:def:20181062
    P
    		RHSA-2018:1062: kernel security, bug fix, and enhancement update (Important)
    2018-04-10
    oval:com.ubuntu.xenial:def:201715126000
    V
    		CVE-2017-15126 on Ubuntu 16.04 LTS (xenial) - medium.
    2018-01-14
    oval:com.ubuntu.xenial:def:2017151260000000
    V
    		CVE-2017-15126 on Ubuntu 16.04 LTS (xenial) - medium.
    2018-01-14
    oval:com.ubuntu.artful:def:201715126000
    V
    		CVE-2017-15126 on Ubuntu 17.10 (artful) - medium.
    2018-01-14
    oval:com.ubuntu.trusty:def:201715126000
    V
    		CVE-2017-15126 on Ubuntu 14.04 LTS (trusty) - medium.
    2018-01-14
    BACK
    linux linux kernel 4.13.5