Vulnerability Name:

CVE-2020-36557 (CCN-231893)

Assigned:2020-03-21
Published:2020-03-21
Updated:2022-07-27
Summary:A race condition in the Linux kernel before 5.6.2 between the VT_DISALLOCATE ioctl and closing/opening of ttys could lead to a use-after-free.
CVSS v3 Severity:5.1 Medium (CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H)
4.5 Medium (Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Local
Attack Complexity (AC): High
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): High
4.0 Medium (CCN CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L)
3.5 Low (CCN Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/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): Local
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
5.1 Medium (REDHAT CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H)
4.5 Medium (REDHAT Temporal CVSS v3.1 Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C)
Exploitability Metrics:Attack Vector (AV): Local
Attack Complexity (AC): High
Privileges Required (PR): None
User Interaction (UI): None
Scope:Scope (S): Unchanged
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): High
CVSS v2 Severity:2.1 Low (CCN CVSS v2 Vector: AV:L/AC:L/Au:N/C:N/I:N/A:P)
Exploitability Metrics:Access Vector (AV): Local
Access Complexity (AC): Low
Athentication (Au): None
Impact Metrics:Confidentiality (C): None
Integrity (I): None
Availibility (A): Partial
Vulnerability Type:CWE-362
CWE-416
Vulnerability Consequences:Denial of Service
References:Source: MITRE
Type: CNA
CVE-2020-36557

Source: MISC
Type: Patch, Release Notes, Vendor Advisory
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.6.2

Source: XF
Type: UNKNOWN
linux-kernel-cve202036557-dos(231893)

Source: CCN
Type: Linux GIT Repository
vt: vt_ioctl: fix VT_DISALLOCATE freeing in-use virtual console

Source: MISC
Type: Mailing List, Patch, Vendor Advisory
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ca4463bf8438b403596edd0ec961ca0d4fbe0220

Source: CCN
Type: IBM Security Bulletin 6960747 (Spectrum Copy Data Management)
Vulnerabilities in Linux Kernel might affect IBM Spectrum Copy Data Management (CVE-2022-2964, CVE-2022-2601, CVE-2020-36557)

Source: CCN
Type: IBM Security Bulletin 7005589 (Spectrum Protect Plus)
Vulnerabilities in Apache Commons, Tomcat, Go, libcurl, OpenSSL, Python, Node.js, and Linux can affect IBM Spectrum Protect Plus.

Vulnerable Configuration:Configuration 1:
  • cpe:/o:linux:linux_kernel:*:*:*:*:*:*:*:* (Version < 5.6.2)

    • Configuration RedHat 1:
  • cpe:/a:redhat:enterprise_linux:8:*:*:*:*:*:*:*

    • Configuration RedHat 2:
  • cpe:/a:redhat:enterprise_linux:8::crb:*:*:*:*:*

    • Configuration RedHat 3:
  • cpe:/o:redhat:enterprise_linux:8:*:*:*:*:*:*:*

    • Configuration RedHat 4:
  • cpe:/o:redhat:enterprise_linux:8::baseos:*:*:*:*:*

    • Configuration CCN 1:
  • cpe:/o:linux:linux_kernel:5.6.1:*:*:*:*:*:*:*
  • AND
  • cpe:/a:ibm:spectrum_protect_plus:10.1.0:*:*:*:*:*:*:*

    • * Denotes that component is vulnerable
    Oval Definitions
    Definition IDClassTitleLast Modified
    oval:org.opensuse.security:def:4739
    P
    		Security update for the Linux Kernel (Important)
    2022-08-26
    oval:org.opensuse.security:def:707
    P
    		Security update for the Linux Kernel (Important)
    2022-08-23
    oval:org.opensuse.security:def:697
    P
    		Security update for the Linux Kernel (Important)
    2022-08-16
    oval:org.opensuse.security:def:118235
    P
    		Security update for the Linux Kernel (Important)
    2022-08-15
    oval:org.opensuse.security:def:119287
    P
    		Security update for the Linux Kernel (Important)
    2022-08-15
    oval:org.opensuse.security:def:118655
    P
    		Security update for the Linux Kernel (Important)
    2022-08-15
    oval:org.opensuse.security:def:119468
    P
    		Security update for the Linux Kernel (Important)
    2022-08-15
    oval:org.opensuse.security:def:118792
    P
    		Security update for the Linux Kernel (Important)
    2022-08-15
    oval:org.opensuse.security:def:119653
    P
    		Security update for the Linux Kernel (Important)
    2022-08-15
    oval:org.opensuse.security:def:118982
    P
    		Security update for the Linux Kernel (Important)
    2022-08-15
    oval:org.opensuse.security:def:4302
    P
    		Security update for the Linux Kernel (Important)
    2022-08-09
    oval:org.opensuse.security:def:6135
    P
    		Security update for the Linux Kernel (Important)
    2022-08-09
    oval:org.opensuse.security:def:4665
    P
    		Security update for the Linux Kernel (Important)
    2022-08-09
    oval:org.opensuse.security:def:6136
    P
    		Security update for the Linux Kernel (Important)
    2022-08-09
    oval:org.opensuse.security:def:6350
    P
    		Security update for the Linux Kernel (Important)
    2022-08-09
    oval:org.opensuse.security:def:5322
    P
    		Security update for the Linux Kernel (Important)
    2022-08-09
    oval:com.redhat.rhsa:def:20211578
    P
    		RHSA-2021:1578: kernel security, bug fix, and enhancement update (Important)
    2021-05-18
    BACK
    linux linux kernel *
    linux linux kernel 5.6.1
    ibm spectrum protect plus 10.1.0