CVE-2021-4001

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2021-4001
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.

4.1 /10

CVSS v3 : MEDIUM

V3 Legend

Vector :

Exploitability : 0.5 / Impact : 3.6

Attack Vector LOCAL

Attack Complexity HIGH

Privileges Required HIGH

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact HIGH

Availability Impact NONE

Scope UNCHANGED

4.7 /10

CVSS v2.0 : MEDIUM

V2 Legend

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

Exploitability : 3.4 / Impact : 6.9

Access Vector LOCAL

Access Complexity MEDIUM

Authentication NONE

Confidentiality Impact NONE

Integrity Impact COMPLETE

Availability Impact NONE

References
Link Resource
https://bugzilla.redhat.com/show_bug.cgi?id=2025645 Issue Tracking Patch Third Party Advisory
https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git/commit/?id=353050be4c19e102178ccc05988101887c25ae53 Patch Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2025645 Issue Tracking Patch Third Party Advisory
https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git/commit/?id=353050be4c19e102178ccc05988101887c25ae53 Patch Third Party Advisory
Configurations

Configuration 1 (hide)

OR cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.16:rc1:*:*:*:*:*:*
History

21 Nov 2024, 06:36

Type Values Removed Values Added
References () https://bugzilla.redhat.com/show_bug.cgi?id=2025645 - Issue Tracking, Patch, Third Party Advisory () https://bugzilla.redhat.com/show_bug.cgi?id=2025645 - Issue Tracking, Patch, Third Party Advisory
References () https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git/commit/?id=353050be4c19e102178ccc05988101887c25ae53 - Patch, Third Party Advisory () https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git/commit/?id=353050be4c19e102178ccc05988101887c25ae53 - Patch, Third Party Advisory

28 Jan 2022, 14:59

Type Values Removed Values Added
CPE cpe:2.3:o:linux:linux_kernel:5.16:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
CWE CWE-367
CVSS v2 : unknown
v3 : unknown 		v2 : 4.7
v3 : 4.1
References (MISC) https://bugzilla.redhat.com/show_bug.cgi?id=2025645 - (MISC) https://bugzilla.redhat.com/show_bug.cgi?id=2025645 - Issue Tracking, Patch, Third Party Advisory
References (MISC) https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git/commit/?id=353050be4c19e102178ccc05988101887c25ae53 - (MISC) https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git/commit/?id=353050be4c19e102178ccc05988101887c25ae53 - Patch, Third Party Advisory

21 Jan 2022, 19:15

Type Values Removed Values Added
New CVE
Information

Published : 2022-01-21 19:15

Updated : 2024-11-21 06:36

NVD link : CVE-2021-4001

Mitre link : CVE-2021-4001

CVE.ORG link : CVE-2021-4001

JSON object : View

Products Affected

linux

  • linux_kernel
CWE
CWE-367

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