What is CVE-2021-47113?

CVE-2021-47113 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10, classified as a Use After Free flaw (CWE-416), affecting Linux kernel versions from 4.7 onward and patched in 5.10.43, 5.12.10 and 5.13. CVE-2021-47113 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2021-47113?

CVE-2021-47113 has a CVSS score of 5.5 out of 10, rated Medium severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

Is there a patch available for CVE-2021-47113?

Yes, CVE-2021-47113 has been patched. Fixed versions include 5.10.43, 5.12.10 and 5.13. 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-2021-47113 actively exploited?

CVE-2021-47113 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-2021-47113

Medium

In the Linux kernel, the following vulnerability has been resolved: btrfs: abort in rename_exchange if we fail to insert the second ref Error injection stress uncovered a problem where we'd leave a dangling inode ref if we failed during a rename_exchange. This happens because we insert the inode ref for one side of the rename, and then for the other side. If this second inode ref insert fails we'll leave the first one dangling and leave a corrupt file system behind. Fix this by aborting if we did the insert for the first inode ref.

Package Linux Kernel

Published 2024-03-15

Last modified 2025-03-13

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

5.5

out of 10

Medium

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

High

Vector string

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

Weakness type

CWE-416

CVE-2021-47113 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 5.10.43, 5.12.10, 5.13 and their respective stable series.

Affected from

≥ 4.7

Fixed in

✓ 5.10.43 5.10.x ✓ 5.12.10 5.12.x ✓ 5.13

References

3 total

Kernel Git
https://git.kernel.org/stable/c/0df50d47d17401f9f140dfbe752a65e5d72f9932

Patch
Kernel Git
https://git.kernel.org/stable/c/dc09ef3562726cd520c8338c1640872a60187af5

Patch
Kernel Git
https://git.kernel.org/stable/c/ff8de2cec65a8c8521faade12a31b39c80e49f5b

Patch

Details

CVE ID CVE-2021-47113

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2024-03-15

Modified 2025-03-13

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2021-47113?

CVE-2021-47113 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 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 5.10.43, 5.12.10 and 5.13. CVE-2021-47113 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2021-47113?

CVE-2021-47113 has a CVSS score of 5.5 out of 10, rated Medium severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
Is there a patch available for CVE-2021-47113?

Yes. CVE-2021-47113 has been patched. Fixed versions include 5.10.43, 5.12.10 and 5.13. 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-2021-47113 actively exploited?

No. CVE-2021-47113 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.