What is CVE-2021-47565?

CVE-2021-47565 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 3.8 onward and patched in 4.4.294, 4.9.292, 4.14.257 and others. CVE-2021-47565 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2021-47565?

CVE-2021-47565 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-2021-47565?

Yes, CVE-2021-47565 has been patched. Fixed versions include 4.4.294, 4.9.292, 4.14.257 and others. If you are running Linux kernel 3.8 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2021-47565 actively exploited?

CVE-2021-47565 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-2021-47565

High

In the Linux kernel, the following vulnerability has been resolved: scsi: mpt3sas: Fix kernel panic during drive powercycle test While looping over shost's sdev list it is possible that one of the drives is getting removed and its sas_target object is freed but its sdev object remains intact. Consequently, a kernel panic can occur while the driver is trying to access the sas_address field of sas_target object without also checking the sas_target object for NULL.

Package Linux Kernel

Published 2024-05-24

Last modified 2025-09-18

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-2021-47565 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 3.8 and later are affected. Fixed in 4.4.294, 4.9.292, 4.14.257, 4.19.219, 5.4.163, 5.10.83, 5.15.6, 5.16 and their respective stable series.

Affected from

≥ 3.8

Fixed in

✓ 4.4.294 4.4.x ✓ 4.9.292 4.9.x ✓ 4.14.257 4.14.x ✓ 4.19.219 4.19.x ✓ 5.4.163 5.4.x ✓ 5.10.83 5.10.x ✓ 5.15.6 5.15.x ✓ 5.16

References

8 total

Kernel Git
https://git.kernel.org/stable/c/0d4b29eaadc1f59cec0c7e85eae77d08fcca9824

Patch
Kernel Git
https://git.kernel.org/stable/c/0ee4ba13e09c9d9c1cb6abb59da8295d9952328b

Patch
Kernel Git
https://git.kernel.org/stable/c/2bf9c5a5039c8f4b037236aed505e6a25c1d5f7b

Patch
Kernel Git
https://git.kernel.org/stable/c/58ef2c7a6de13721865d84b80eecf56d6cba0937

Patch
Kernel Git
https://git.kernel.org/stable/c/5d4d50b1f159a5ebab7617f47121b4370aa58afe

Patch

Showing 5 of 8 references View all on NVD

Details

CVE ID CVE-2021-47565

Severity High

CVSS score 7.8 / 10

CVSS version 3.1

Published 2024-05-24

Modified 2025-09-18

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2021-47565?

CVE-2021-47565 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 3.8 onward and has been patched in 4.4.294, 4.9.292, 4.14.257 and others. CVE-2021-47565 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2021-47565?

CVE-2021-47565 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-2021-47565?

Yes. CVE-2021-47565 has been patched. Fixed versions include 4.4.294, 4.9.292, 4.14.257 and others. If you are running Linux kernel 3.8 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2021-47565 actively exploited?

No. CVE-2021-47565 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.