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RedhatCVE-2021-20194

HistoryFeb 23, 2021 - 11:15 p.m.

CVE-2021-20194

2021-02-2323:15:13

CWE-787

CWE-20

redhat

web.nvd.nist.gov

198

linux

kernel

vulnerability

bpf

cgroups

heap overflow

nvd

cve-2021-20194

CVSS2

4.6

Attack Vector

LOCAL

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

PARTIAL

Integrity Impact

PARTIAL

Availability Impact

PARTIAL

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

CVSS3

7.8

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

AI Score

7.5

Confidence

High

EPSS

Percentile

5.1%

JSON

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.

Affected configurations

Nvd

Vulners

Node

linuxlinux_kernelRange5.2>

Node

redhatopenshift_container_platformMatch4.4

redhatopenshift_container_platformMatch4.5

redhatopenshift_container_platformMatch4.6

redhatenterprise_linuxMatch8.0

VendorProductVersionCPE
linuxlinux_kernel*cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
redhatopenshift_container_platform4.4cpe:2.3:a:redhat:openshift_container_platform:4.4:*:*:*:*:*:*:*
redhatopenshift_container_platform4.5cpe:2.3:a:redhat:openshift_container_platform:4.5:*:*:*:*:*:*:*
redhatopenshift_container_platform4.6cpe:2.3:a:redhat:openshift_container_platform:4.6:*:*:*:*:*:*:*
redhatenterprise_linux8.0cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*

Vendor	Product	Version	CPE
linux	linux_kernel	*	cpe:2.3:o:linux:linux_kernel::::::::
redhat	openshift_container_platform	4.4	cpe:2.3:a:redhat:openshift_container_platform:4.4:::::::*
redhat	openshift_container_platform	4.5	cpe:2.3:a:redhat:openshift_container_platform:4.5:::::::*
redhat	openshift_container_platform	4.6	cpe:2.3:a:redhat:openshift_container_platform:4.6:::::::*
redhat	enterprise_linux	8.0	cpe:2.3:o:redhat:enterprise_linux:8.0:::::::*

CNA Affected

[
  {
    "product": "kernel",
    "vendor": "n/a",
    "versions": [
      {
        "status": "affected",
        "version": "kernel 5.2 and higher."
      }
    ]
  }
]