What is CVE-2021-47427?

CVE-2021-47427 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 5.14 onward and patched in 5.14.12 and 5.15. CVE-2021-47427 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2021-47427?

CVE-2021-47427 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-2021-47427?

Yes, CVE-2021-47427 has been patched. Fixed versions include 5.14.12 and 5.15. If you are running Linux kernel 5.14 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2021-47427 actively exploited?

CVE-2021-47427 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-2021-47427

High

In the Linux kernel, the following vulnerability has been resolved: scsi: iscsi: Fix iscsi_task use after free Commit d39df158518c ("scsi: iscsi: Have abort handler get ref to conn") added iscsi_get_conn()/iscsi_put_conn() calls during abort handling but then also changed the handling of the case where we detect an already completed task where we now end up doing a goto to the common put/cleanup code. This results in a iscsi_task use after free, because the common cleanup code will do a put on the iscsi_task. This reverts the goto and moves the iscsi_get_conn() to after we've checked if the iscsi_task is valid.

Package Linux Kernel

Published 2024-05-21

Last modified 2024-12-31

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-2021-47427 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 5.14 and later are affected. Fixed in 5.14.12, 5.15 and their respective stable series.

Affected from

≥ 5.14

Fixed in

✓ 5.14.12 5.14.x ✓ 5.15

References

2 total

Kernel Git
https://git.kernel.org/stable/c/1642f51ac0d4f2b55d5748094c49ff8f7191b93c

Patch
Kernel Git
https://git.kernel.org/stable/c/258aad75c62146453d03028a44f2f1590d58e1f6

Patch

Details

CVE ID CVE-2021-47427

Severity High

CVSS score 7.8 / 10

CVSS version 3.1

Published 2024-05-21

Modified 2024-12-31

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2021-47427?

CVE-2021-47427 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 5.14 onward and has been patched in 5.14.12 and 5.15. CVE-2021-47427 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2021-47427?

CVE-2021-47427 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-2021-47427?

Yes. CVE-2021-47427 has been patched. Fixed versions include 5.14.12 and 5.15. If you are running Linux kernel 5.14 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2021-47427 actively exploited?

No. CVE-2021-47427 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.