DEBIAN-CVE-2021-20194

Advisory lineage Upstream: 1 Downstream: 0
Upstream
CVE-2021-20194
Published: 23 Feb 2021, 23:15
Last modified:28 Apr 2026, 20:21

Vulnerability Summary

Overall Risk (default)
medium
31/100
CVSS Score
7.8 HIGH
3.1 (osv_debian)
EPSS Score
No data
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

23 Feb 2021, 23:15
Published
Vulnerability first disclosed
28 Apr 2026, 20:21
Last Modified
Vulnerability information updated

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.

CVSS Metrics

  • v3.1•HIGH•Score: 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected Systems

  • debian•linux

    < 5.10.19-1 | < 5.10.19-1 | < 5.10.19-1 | < 5.10.19-1

References (1)