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.

CVSS v3 7.8 HIGH
CVSS v2.0 4.6 MEDIUM

7.8^/10

CVSS v3 : HIGH

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

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

05 Aug 2022, 18:07

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

Information

Published : 2021-02-23 23:15

Updated : 2024-02-04 21:23

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

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