DEBIAN-CVE-2021-4001

Advisory lineage Upstream: 1 Downstream: 0
Upstream
CVE-2021-4001
Published: 21 Jan 2022, 19:15
Last modified:28 Apr 2026, 20:22

Vulnerability Summary

Overall Risk (default)
low
16/100
CVSS Score
4.1 MEDIUM
3.1 (osv_debian)
EPSS Score
No data
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

21 Jan 2022, 19:15
Published
Vulnerability first disclosed
28 Apr 2026, 20:22
Last Modified
Vulnerability information updated

Description

A race condition was found in the Linux kernel's ebpf verifier between bpf_map_update_elem and bpf_map_freeze due to a missing lock in kernel/bpf/syscall.c. In this flaw, a local user with a special privilege (cap_sys_admin or cap_bpf) can modify the frozen mapped address space. This flaw affects kernel versions prior to 5.16 rc2.

CVSS Metrics

  • v3.1•MEDIUM•Score: 4.1CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:H/A:N

Affected Systems

  • debian•linux

    < 5.10.84-1 | < 5.15.5-1 | < 5.15.5-1 | < 5.15.5-1

References (1)