CVE-2021-20194

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2021-20194
There is a vulnerability in the linux kernel versions higher than 5.2 (if kernel compiled with config params CONFIG_BPF_SYSCALL=y , CONFIG_BPF=y , CONFIG_CGROUPS=y , CONFIG_CGROUP_BPF=y , CONFIG_HARDENED_USERCOPY not set, and BPF hook to getsockopt is registered). As result of BPF execution, the local user can trigger bug in __cgroup_bpf_run_filter_getsockopt() function that can lead to heap overflow (because of non-hardened usercopy). The impact of attack could be deny of service or possibly privileges escalation.

7.8 /10

CVSS v3 : HIGH

V3 Legend

Vector :

Exploitability : 1.8 / Impact : 5.9

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

4.6 /10

CVSS v2.0 : MEDIUM

V2 Legend

Vector : AV:L/AC:L/Au:N/C:P/I:P/A:P

Exploitability : 3.9 / Impact : 6.4

Access Vector LOCAL

Access Complexity LOW

Authentication NONE

Confidentiality Impact PARTIAL

Integrity Impact PARTIAL

Availability Impact PARTIAL

References
Link Resource
https://bugzilla.redhat.com/show_bug.cgi?id=1912683 Issue Tracking Patch Third Party Advisory
https://security.netapp.com/advisory/ntap-20210326-0003/ Third Party Advisory
Configurations

Configuration 1 (hide)

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

Configuration 2 (hide)

OR cpe:2.3:a:redhat:openshift_container_platform:4.4:*:*:*:*:*:*:*
cpe:2.3:a:redhat:openshift_container_platform:4.5:*:*:*:*:*:*:*
cpe:2.3:a:redhat:openshift_container_platform:4.6:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*
History

12 Feb 2023, 22:15

Type Values Removed Values Added
References
  • {'url': 'https://access.redhat.com/security/cve/CVE-2021-20194', 'name': 'https://access.redhat.com/security/cve/CVE-2021-20194', 'tags': [], 'refsource': 'MISC'}
  • {'url': 'https://access.redhat.com/errata/RHSA-2021:4140', 'name': 'https://access.redhat.com/errata/RHSA-2021:4140', 'tags': [], 'refsource': 'MISC'}
  • {'url': 'https://access.redhat.com/errata/RHSA-2021:4356', 'name': 'https://access.redhat.com/errata/RHSA-2021:4356', 'tags': [], 'refsource': 'MISC'}
CWE CWE-787 CWE-20
Summary A flaw buffer overflow in the Linux kernel BPF subsystem was found in the way user running BPF script calling getsockopt. A local user could use this flaw to crash the system or possibly escalate their privileges on the system. There is a vulnerability in the linux kernel versions higher than 5.2 (if kernel compiled with config params CONFIG_BPF_SYSCALL=y , CONFIG_BPF=y , CONFIG_CGROUPS=y , CONFIG_CGROUP_BPF=y , CONFIG_HARDENED_USERCOPY not set, and BPF hook to getsockopt is registered). As result of BPF execution, the local user can trigger bug in __cgroup_bpf_run_filter_getsockopt() function that can lead to heap overflow (because of non-hardened usercopy). The impact of attack could be deny of service or possibly privileges escalation.

02 Feb 2023, 21:20

Type Values Removed Values Added
Summary There is a vulnerability in the linux kernel versions higher than 5.2 (if kernel compiled with config params CONFIG_BPF_SYSCALL=y , CONFIG_BPF=y , CONFIG_CGROUPS=y , CONFIG_CGROUP_BPF=y , CONFIG_HARDENED_USERCOPY not set, and BPF hook to getsockopt is registered). As result of BPF execution, the local user can trigger bug in __cgroup_bpf_run_filter_getsockopt() function that can lead to heap overflow (because of non-hardened usercopy). The impact of attack could be deny of service or possibly privileges escalation. A flaw buffer overflow in the Linux kernel BPF subsystem was found in the way user running BPF script calling getsockopt. A local user could use this flaw to crash the system or possibly escalate their privileges on the system.
References
  • (MISC) https://access.redhat.com/security/cve/CVE-2021-20194 -
  • (MISC) https://access.redhat.com/errata/RHSA-2021:4140 -
  • (MISC) https://access.redhat.com/errata/RHSA-2021:4356 -

05 Aug 2022, 18:07

Type Values Removed Values Added
CWE CWE-20 CWE-787

31 Mar 2021, 12:29

Type Values Removed Values Added
References (CONFIRM) https://security.netapp.com/advisory/ntap-20210326-0003/ - (CONFIRM) https://security.netapp.com/advisory/ntap-20210326-0003/ - Third Party Advisory

26 Mar 2021, 11:15

Type Values Removed Values Added
References
  • (CONFIRM) https://security.netapp.com/advisory/ntap-20210326-0003/ -

27 Feb 2021, 03:08

Type Values Removed Values Added
References (MISC) https://bugzilla.redhat.com/show_bug.cgi?id=1912683 - (MISC) https://bugzilla.redhat.com/show_bug.cgi?id=1912683 - Issue Tracking, Patch, Third Party Advisory
CVSS v2 : unknown
v3 : unknown 		v2 : 4.6
v3 : 7.8
CPE cpe:2.3:a:redhat:openshift_container_platform:4.5:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:a:redhat:openshift_container_platform:4.4:*:*:*:*:*:*:*
cpe:2.3:a:redhat:openshift_container_platform:4.6:*:*:*:*:*:*:*

23 Feb 2021, 23:32

Type Values Removed Values Added
New CVE
Information

Published : 2021-02-23 23:15

Updated : 2023-12-10 13:41

NVD link : CVE-2021-20194

Mitre link : CVE-2021-20194

CVE.ORG link : CVE-2021-20194

JSON object : View

Products Affected

redhat

  • openshift_container_platform
  • enterprise_linux

linux

  • linux_kernel
CWE
CWE-20

Improper Input Validation

CWE-787

Out-of-bounds Write