P5Verified

CVE-2021-4001: linux kernel through 5.15 (inclusive), 5.16 · update rc1; +1 more affected products

CVE-2021-4001. CVSS 3.1 base score 4.1 (MEDIUM, NVD). EPSS 0.00186 (percentile 0.07549), scored 2026-10-08.

Affected technology

linux kernel · through 5.15 (inclusive)
linux

linux kernel · 5.16 · update rc1
linux

kernel · kernel 5.16 rc2
Vendor not specified by the source

Component: Not specified by the source

Attack conditions (NVD, CVSS 3.1): Local · High privileges required · No user interaction required

What an attacker can do

A local user with a special privilege (cap_sys_admin or cap_bpf) can modify the frozen mapped address space. NVD’s CVSS 3.1 assessment (base score 4.1/10) rates confidentiality and availability impact as none; integrity impact as high.

Published 2026-10-09 03:15:35.204620+00:00

CWE: CWE-367
CCR priority: 16.4 /100 (P5)
CVSS 3.1: 4.1 /10 · CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:H/A:N · NVD
EPSS: 0.00186 · percentile 0.07549 · 2026-10-08
KEV: no

Provenance

NVD CVE API 2.0 · Source record · observed 2026-10-09 03:13:32.966430+00:00 UTC

Stable permalink: https://cybercodered.org/item/cve-cve-2021-4001.html