CVE-2021-4150 : A use-after-free flaw was found in the add

A use-after-free flaw was found in the add_partition in block/partitions/core.c in the Linux kernel. A local attacker with user privileges could cause a denial of service on the system. The issue results from the lack of code cleanup when device_add call fails when adding a partition to the disk.

Published 2022-03-23 20:15:10

Updated 2022-06-22 15:55:44

Source Red Hat, Inc.

View at NVD, CVE.org

Vulnerability category: Memory CorruptionDenial of service

Products affected by CVE-2021-4150

Linux » Linux Kernel
Versions before (<) 5.15
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Matching versions
Linux » Linux Kernel » Version: 5.15 Update RC1
cpe:2.3:o:linux:linux_kernel:5.15:rc1:*:*:*:*:*:*
Matching versions
Linux » Linux Kernel » Version: 5.15 Update RC2
cpe:2.3:o:linux:linux_kernel:5.15:rc2:*:*:*:*:*:*
Matching versions
Linux » Linux Kernel » Version: 5.15 Update RC3
cpe:2.3:o:linux:linux_kernel:5.15:rc3:*:*:*:*:*:*
Matching versions
Linux » Linux Kernel » Version: 5.15 Update RC4
cpe:2.3:o:linux:linux_kernel:5.15:rc4:*:*:*:*:*:*
Matching versions
Linux » Linux Kernel » Version: 5.15 Update RC5
cpe:2.3:o:linux:linux_kernel:5.15:rc5:*:*:*:*:*:*
Matching versions
Linux » Linux Kernel » Version: 5.15 Update RC6
cpe:2.3:o:linux:linux_kernel:5.15:rc6:*:*:*:*:*:*
Matching versions
Linux » Linux Kernel » Version: 5.15
cpe:2.3:o:linux:linux_kernel:5.15:*:*:*:*:*:*:*
Matching versions

Threat overview for CVE-2021-4150

Top countries where our scanners detected CVE-2021-4150

Top open port discovered on systems with this issue 49152

IPs affected by CVE-2021-4150 400,840

Threat actors abusing to this issue? Yes

Find out if you^* are affected by CVE-2021-4150!

^*Directly or indirectly through your vendors, service providers and 3rd parties. Powered by attack surface intelligence from SecurityScorecard.

Exploit prediction scoring system (EPSS) score for CVE-2021-4150

EPSS FAQ

0.04%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 6 %

Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2021-4150

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
4.9	MEDIUM	AV:L/AC:L/Au:N/C:N/I:N/A:C	3.9	6.9	NIST
Access Vector: Local Access Complexity: Low Authentication: None Confidentiality Impact: None Integrity Impact: None Availability Impact: Complete
5.5	MEDIUM	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H	1.8	3.6	NIST
Attack Vector: Local Attack Complexity: Low Privileges Required: Low User Interaction: None Scope: Unchanged Confidentiality: None Integrity: None Availability: High

CWE ids for CVE-2021-4150

CWE-416 Use After Free

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.
Assigned by:
- nvd@nist.gov (Primary)
- secalert@redhat.com (Secondary)

References for CVE-2021-4150

https://bugzilla.redhat.com/show_bug.cgi?id=2025938

2025938 – (CVE-2021-4150) CVE-2021-4150 kernel: Block subsystem mishandles reference counts
Issue Tracking;Third Party Advisory
https://lkml.org/lkml/2021/10/18/485

LKML: Zqiang: [PATCH v3] block: fix incorrect references to disk objects
Exploit;Third Party Advisory
https://lkml.org/lkml/2021/9/6/781

LKML: Hao Sun: WARNING in __init_work
Exploit;Third Party Advisory