What is CVE-2021-47061?

CVE-2021-47061 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 4.4.238 onward and patched in 5.10.37, 5.11.21, 5.12.4 and others. CVE-2021-47061 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2021-47061?

CVE-2021-47061 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-2021-47061?

Yes, CVE-2021-47061 has been patched. Fixed versions include 5.10.37, 5.11.21, 5.12.4 and others. If you are running Linux kernel 4.4.238 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2021-47061 actively exploited?

CVE-2021-47061 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-2021-47061

High

In the Linux kernel, the following vulnerability has been resolved: KVM: Destroy I/O bus devices on unregister failure _after_ sync'ing SRCU If allocating a new instance of an I/O bus fails when unregistering a device, wait to destroy the device until after all readers are guaranteed to see the new null bus. Destroying devices before the bus is nullified could lead to use-after-free since readers expect the devices on their reference of the bus to remain valid.

Package Linux Kernel

Published 2024-02-29

Last modified 2024-12-10

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-2021-47061 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 4.4.238, 4.9.238, 4.14.200, 4.19.148, 5.4.66, 5.8.10, 5.9 and later are affected. Fixed in 5.10.37, 5.11.21, 5.12.4, 5.13 and their respective stable series.

Affected from

≥ 4.4.238 ≥ 4.9.238 ≥ 4.14.200 ≥ 4.19.148 ≥ 5.4.66 ≥ 5.8.10 ≥ 5.9

Fixed in

✓ 5.10.37 5.10.x ✓ 5.11.21 5.11.x ✓ 5.12.4 5.12.x ✓ 5.13

References

4 total

Kernel Git
https://git.kernel.org/stable/c/03c6cccedd3913006744faa252a4da5145299343

Patch
Kernel Git
https://git.kernel.org/stable/c/2ee3757424be7c1cd1d0bbfa6db29a7edd82a250

Patch
Kernel Git
https://git.kernel.org/stable/c/30f46c6993731efb2a690c9197c0fd9ed425da2d

Patch
Kernel Git
https://git.kernel.org/stable/c/4e899ca848636b37e9ac124bc1723862a7d7d927

Patch

Details

CVE ID CVE-2021-47061

Severity High

CVSS score 7.8 / 10

CVSS version 3.1

Published 2024-02-29

Modified 2024-12-10

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2021-47061?

CVE-2021-47061 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 4.4.238 onward and has been patched in 5.10.37, 5.11.21, 5.12.4 and others. CVE-2021-47061 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2021-47061?

CVE-2021-47061 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-2021-47061?

Yes. CVE-2021-47061 has been patched. Fixed versions include 5.10.37, 5.11.21, 5.12.4 and others. If you are running Linux kernel 4.4.238 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2021-47061 actively exploited?

No. CVE-2021-47061 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.