Vulnerability Name:

CVE-2020-12826 (CCN-182113)

Assigned:2020-04-08
Published:2020-04-08
Updated:2021-07-15
Summary:A signal access-control issue was discovered in the Linux kernel before 5.6.5, aka CID-7395ea4e65c2. Because exec_id in include/linux/sched.h is only 32 bits, an integer overflow can interfere with a do_notify_parent protection mechanism. A child process can send an arbitrary signal to a parent process in a different security domain. Exploitation limitations include the amount of elapsed time before an integer overflow occurs, and the lack of scenarios where signals to a parent process present a substantial operational threat.
CVSS v3 Severity:5.3 Medium (CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L)
4.6 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/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): Low
Integrity (I): Low
Availibility (A): Low
6.2 Medium (CCN CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N)
5.4 Medium (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N/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): None
Integrity (I): High
Availibility (A): None
5.3 Medium (REDHAT CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L)
4.6 Medium (REDHAT Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/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): Low
Integrity (I): Low
Availibility (A): Low
CVSS v2 Severity:4.4 Medium (CVSS v2 Vector: AV:L/AC:M/Au:N/C:P/I:P/A:P)
Exploitability Metrics:Access Vector (AV): Local
Access Complexity (AC): Medium
Authentication (Au): None
Impact Metrics:Confidentiality (C): Partial
Integrity (I): Partial
Availibility (A): Partial
4.9 Medium (CCN CVSS v2 Vector: AV:L/AC:L/Au:N/C:N/I:C/A:N)
Exploitability Metrics:Access Vector (AV): Local
Access Complexity (AC): Low
Athentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): Complete
Availibility (A): None
Vulnerability Type:CWE-190
CWE-94
Vulnerability Consequences:Bypass Security
References:Source: MITRE
Type: CNA
CVE-2020-12826

Source: CCN
Type: Red Hat Bugzilla – Bug 1822077
(CVE-2020-12826) - CVE-2020-12826 kernel: possible to send arbitrary signals to a privileged (suidroot) parent process

Source: CONFIRM
Type: Issue Tracking, Patch, Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1822077

Source: MISC
Type: Release Notes, Third Party Advisory
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.6.5

Source: XF
Type: UNKNOWN
linux-kernel-cve202012826-sec-bypass(182113)

Source: MISC
Type: Patch, Third Party Advisory
https://github.com/torvalds/linux/commit/7395ea4e65c2a00d23185a3f63ad315756ba9cef

Source: MLIST
Type: UNKNOWN
[debian-lts-announce] 20200609 [SECURITY] [DLA 2241-1] linux security update

Source: MLIST
Type: UNKNOWN
[debian-lts-announce] 20200610 [SECURITY] [DLA 2241-2] linux security update

Source: MISC
Type: Exploit, Mailing List, Patch, Third Party Advisory
https://lists.openwall.net/linux-kernel/2020/03/24/1803

Source: CONFIRM
Type: UNKNOWN
https://security.netapp.com/advisory/ntap-20200608-0001/

Source: UBUNTU
Type: Third Party Advisory
USN-4367-1

Source: UBUNTU
Type: UNKNOWN
USN-4369-1

Source: UBUNTU
Type: UNKNOWN
USN-4391-1

Source: CCN
Type: IBM Security Bulletin 6381344 (Elastic Storage Server)
There are multiple vulnerabilities in the Linux Kernel used in IBM Elastic Storage System

Source: CCN
Type: IBM Security Bulletin 6410788 (Data Risk Manager)
IBM Data Risk Manager is affected by multiple vulnerabilities

Source: CCN
Type: IBM Security Bulletin 6410876 (Spectrum Protect Plus)
Vulnerabilities in Linux Kernel and Java affect IBM Spectrum Protect Plus

Source: CCN
Type: IBM Security Bulletin 6420079 (Security Guardium)
IBM Security Guardium is affected by kernel vulnerabilities

Source: CCN
Type: IBM Security Bulletin 6601949 (QRadar Network Security)
IBM QRadar Network Security is affected by multiple vulnerabilities in kernel.

Source: CCN
Type: Kernel Web site
The Linux Kernel Archives

Source: MISC
Type: Exploit, Mailing List, Patch, Third Party Advisory
https://www.openwall.com/lists/kernel-hardening/2020/03/25/1

Source: CCN
Type: WhiteSource Vulnerability Database
CVE-2020-12826

Vulnerable Configuration:Configuration 1:
  • cpe:/o:linux:linux_kernel:*:*:*:*:*:*:*:* (Version < 5.6.5)

    • Configuration 2:
  • cpe:/o:redhat:enterprise_mrg:2.0:*:*:*:*:*:*:*
  • OR cpe:/o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:*
  • OR cpe:/o:redhat:enterprise_linux:5.0:*:*:*:*:*:*:*
  • OR cpe:/o:redhat:enterprise_linux:6.0:*:*:*:*:*:*:*
  • OR cpe:/o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*
  • OR cpe:/o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*

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

    • Configuration RedHat 2:
  • cpe:/o:redhat:enterprise_linux:7::client:*:*:*:*:*

    • Configuration RedHat 3:
  • cpe:/o:redhat:enterprise_linux:7::computenode:*:*:*:*:*

    • Configuration RedHat 4:
  • cpe:/o:redhat:enterprise_linux:7::server:*:*:*:*:*

    • Configuration RedHat 5:
  • cpe:/o:redhat:enterprise_linux:7::workstation:*:*:*:*:*

    • Configuration RedHat 6:
  • cpe:/a:redhat:rhel_extras_rt:7:*:*:*:*:*:*:*

    • Configuration RedHat 7:
  • cpe:/a:redhat:enterprise_linux:8:*:*:*:*:*:*:*

    • Configuration RedHat 8:
  • cpe:/a:redhat:enterprise_linux:8::crb:*:*:*:*:*

    • Configuration RedHat 9:
  • cpe:/o:redhat:enterprise_linux:8:*:*:*:*:*:*:*

    • Configuration RedHat 10:
  • cpe:/o:redhat:enterprise_linux:8::baseos:*:*:*:*:*

    • Configuration RedHat 11:
  • cpe:/a:redhat:enterprise_linux:8::nfv:*:*:*:*:*

    • Configuration RedHat 12:
  • cpe:/a:redhat:enterprise_linux:8::realtime:*:*:*:*:*

    • Configuration CCN 1:
  • cpe:/o:linux:linux_kernel:5.6.4:*:*:*:*:*:*:*
  • AND
  • cpe:/a:ibm:spectrum_protect_plus:10.1.0:*:*:*:*:*:*:*
  • OR cpe:/a:ibm:qradar_network_security:5.4.0:*:*:*:*:*:*:*
  • OR cpe:/a:ibm:qradar_network_security:5.5.0:*:*:*:*:*:*:*
  • OR cpe:/a:ibm:security_guardium:11.0:*:*:*:*:*:*:*
  • OR cpe:/a:ibm:security_guardium:11.1:*:*:*:*:*:*:*
  • OR cpe:/a:ibm:elastic_storage_server:6.0.0:*:*:*:*:*:*:*
  • OR cpe:/a:ibm:data_risk_manager:2.0.6:*:*:*:*:*:*:*
  • OR cpe:/a:ibm:security_guardium:11.2:*:*:*:*:*:*:*
  • OR cpe:/a:ibm:elastic_storage_server:6.0.1.1:*:*:*:*:*:*:*
  • OR cpe:/a:ibm:spectrum_protect_plus:10.1.7:*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    Oval Definitions
    Definition IDClassTitleLast Modified
    oval:com.redhat.rhsa:def:20204431
    P
    		RHSA-2020:4431: kernel security, bug fix, and enhancement update (Moderate)
    2020-11-04
    oval:com.redhat.rhsa:def:20204609
    P
    		RHSA-2020:4609: kernel-rt security and bug fix update (Moderate)
    2020-11-04
    oval:com.redhat.rhsa:def:20204062
    P
    		RHSA-2020:4062: kernel-rt security and bug fix update (Important)
    2020-09-29
    oval:com.redhat.rhsa:def:20204060
    P
    		RHSA-2020:4060: kernel security, bug fix, and enhancement update (Important)
    2020-09-29
    BACK
    linux linux kernel *
    redhat enterprise mrg 2.0
    canonical ubuntu linux 20.04
    redhat enterprise linux 5.0
    redhat enterprise linux 6.0
    redhat enterprise linux 7.0
    redhat enterprise linux 8.0
    linux linux kernel 5.6.4
    ibm spectrum protect plus 10.1.0
    ibm qradar network security 5.4.0
    ibm qradar network security 5.5.0
    ibm security guardium 11.0
    ibm security guardium 11.1
    ibm elastic storage server 6.0.0
    ibm data risk manager 2.0.6
    ibm security guardium 11.2
    ibm elastic storage server 6.0.1.1
    ibm spectrum protect plus 10.1.7