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CVE-2021-4001

Date: January 20, 2022

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.

Severity Score

Related Resources (7)

https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git/commit/?id=353050be4c19e102178ccc05988101887c25ae53
https://access.redhat.com/security/cve/CVE-2021-4001
https://bugzilla.redhat.com/show_bug.cgi?id=2025645
https://nvd.nist.gov/vuln/detail/CVE-2021-4001
https://security-tracker.debian.org/tracker/CVE-2021-4001
https://people.canonical.com/~ubuntu-security/cve/CVE-2021-4001
https://www.mend.io/vulnerability-database/CVE-2021-4001

Severity Score

Weakness Type (CWE)

Time-of-check Time-of-use (TOCTOU) Race Condition

CWE-367

CVSS v3.1

Base Score:
Attack Vector (AV): LOCAL
Attack Complexity (AC): HIGH
Privileges Required (PR): HIGH
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): HIGH
Availability (A): NONE

CVSS v2

Base Score:
Access Vector (AV): LOCAL
Access Complexity (AC): MEDIUM
Authentication (AU): NONE
Confidentiality (C): NONE
Integrity (I): COMPLETE
Availability (A): NONE
Additional information:

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