What is CVE-2021-47361?

CVE-2021-47361 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10, classified as a Use After Free flaw (CWE-416), affecting Linux kernel versions from 4.7 onward and patched in 4.9.285, 4.14.249, 4.19.209 and others. CVE-2021-47361 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2021-47361?

CVE-2021-47361 has a CVSS score of 7.8 out of 10, rated High severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Is there a patch available for CVE-2021-47361?

Yes, CVE-2021-47361 has been patched. Fixed versions include 4.9.285, 4.14.249, 4.19.209 and others. If you are running Linux kernel 4.7 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2021-47361 actively exploited?

CVE-2021-47361 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is Use After Free (CWE-416)?

The product references memory after it has been freed, which may cause it to crash, use unexpected values, or execute code. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/416.html

CVE-2021-47361

High

In the Linux kernel, the following vulnerability has been resolved: mcb: fix error handling in mcb_alloc_bus() There are two bugs: 1) If ida_simple_get() fails then this code calls put_device(carrier) but we haven't yet called get_device(carrier) and probably that leads to a use after free. 2) After device_initialize() then we need to use put_device() to release the bus. This will free the internal resources tied to the device and call mcb_free_bus() which will free the rest.

Package Linux Kernel

Published 2024-05-21

Last modified 2024-12-26

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

7.8

out of 10

High

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Vector string

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

Weakness type

CWE-416

CVE-2021-47361 is a Use After Free vulnerability

What is Use After Free?

The product references memory after it has been freed, which may cause it to crash, use unexpected values, or execute code. Learn more on MITRE CWE

Affected versions

Linux kernel versions 4.7 and later are affected. Fixed in 4.9.285, 4.14.249, 4.19.209, 5.4.150, 5.10.70, 5.14.9, 5.15 and their respective stable series.

Affected from

≥ 4.7

Fixed in

✓ 4.9.285 4.9.x ✓ 4.14.249 4.14.x ✓ 4.19.209 4.19.x ✓ 5.4.150 5.4.x ✓ 5.10.70 5.10.x ✓ 5.14.9 5.14.x ✓ 5.15

References

7 total

Kernel Git
https://git.kernel.org/stable/c/115b07d9f47e3996430b8f2007edd9768e1f807f

Patch
Kernel Git
https://git.kernel.org/stable/c/25a1433216489de4abc889910f744e952cb6dbae

Patch
Kernel Git
https://git.kernel.org/stable/c/66f74ba9be9daf9c47fface6af3677f602774f6b

Patch
Kernel Git
https://git.kernel.org/stable/c/7751f609eadf36b1f53712bae430019c53a16eb0

Patch
Kernel Git
https://git.kernel.org/stable/c/8a558261fa57a6deefb0925ab1829f698b194aea

Patch

Showing 5 of 7 references View all on NVD

Details

CVE ID CVE-2021-47361

Severity High

CVSS score 7.8 / 10

CVSS version 3.1

Published 2024-05-21

Modified 2024-12-26

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2021-47361?

CVE-2021-47361 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10 , classified as an Use After Free flaw (CWE-416) . It affects Linux kernel versions from 4.7 onward and has been patched in 4.9.285, 4.14.249, 4.19.209 and others. CVE-2021-47361 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2021-47361?

CVE-2021-47361 has a CVSS score of 7.8 out of 10, rated High severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
Is there a patch available for CVE-2021-47361?

Yes. CVE-2021-47361 has been patched. Fixed versions include 4.9.285, 4.14.249, 4.19.209 and others. If you are running Linux kernel 4.7 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2021-47361 actively exploited?

No. CVE-2021-47361 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.