CVE-2021-20194

HighCVSS 7.8/10Last modified Jun 17, 2026

Description

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.

Metrics

CVSS 3.1 7.8/10CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-20 CWE-787

Affected software

Vendor	Product	Versions
n/a	kernel	kernel 5.2 and higher.

References

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

Timeline

Published: Feb 23, 2021
Last modified: Jun 17, 2026
NVD status: Modified

Related CVEs from 2021

CVE-2021-201959.6A flaw was found in keycloak in versions before 13.0.0. A Self Stored XSS attack vector escalating to a complete account takeover is possibl CVE-2021-201966.5A NULL pointer dereference flaw was found in the floppy disk emulator of QEMU. This issue occurs while processing read/write ioport commands CVE-2021-201976.3There is an open race window when writing output in the following utilities in GNU binutils version 2.35 and earlier:ar, objcopy, strip, ran CVE-2021-201988.1A flaw was found in the OpenShift Installer before version v0.9.0-master.0.20210125200451-95101da940b0. During installation of OpenShift Con CVE-2021-201995.9Rootless containers run with Podman, receive all traffic with a source IP address of 127.0.0.1 (including from remote hosts). This impacts c CVE-2021-20206.5Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Optimizer). Supported versions that are affected are 8.0.20 an CVE-2021-202015.3A flaw was found in spice in versions before 0.14.92. A DoS tool might make it easier for remote attackers to cause a denial of service (CPU CVE-2021-202027.3A flaw was found in keycloak. Directories can be created prior to the Java process creating them in the temporary directory, but with wider CVE-2021-202033.2An integer overflow issue was found in the vmxnet3 NIC emulator of the QEMU for versions up to v5.2.0. It may occur if a guest was to supply CVE-2021-202049.8A heap memory corruption problem (use after free) can be triggered in libgetdata v0.10.0 when processing maliciously crafted dirfile databas CVE-2021-202056.5Libjpeg-turbo versions 2.0.91 and 2.0.90 is vulnerable to a denial of service vulnerability caused by a divide by zero when processing a cra CVE-2021-202067.2An improper limitation of path name flaw was found in containernetworking/cni in versions before 0.8.1. When specifying the plugin to load i