CVEvulnerability

CVE-2021-4001

4.1 MEDIUM Published 2022-01-21 Modified 2026-10-08 Official page ↗
Status
Modified
Published
2022-01-21
Last modified
2026-10-08
Assigner
[email protected]
CVSS 3.1 ([email protected])
4.1 MEDIUM — CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:H/A:N
CVSS 2.0 ([email protected])
4.7 MEDIUM — AV:L/AC:M/Au:N/C:N/I:C/A:N
Weaknesses
CWE-367

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.

Affected configurations

• linux linux kernel (<= 5.15) • linux linux kernel 5.16

Related

Weakness · CWE (1)

  • CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition weakness

References