CVE-2021-4001

medium

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.

References

https://bugzilla.redhat.com/show_bug.cgi?id=2025645

https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git/commit/?id=353050be4c19e102178ccc05988101887c25ae53

Details

Source: MITRE

Published: 2022-01-21

Updated: 2022-11-16

Type: CWE-367

Risk Information

CVSS v2

Base Score: 4.7

Vector: AV:L/AC:M/Au:N/C:N/I:C/A:N

Impact Score: 6.9

Exploitability Score: 3.4

Severity: MEDIUM

CVSS v3

Base Score: 4.1

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

Impact Score: 3.6

Exploitability Score: 0.5

Severity: MEDIUM