What is CVE-2021-47500?

CVE-2021-47500 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 4.2 onward and patched in 4.4.295, 4.9.293, 4.14.258 and others. CVE-2021-47500 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2021-47500?

CVE-2021-47500 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-2021-47500?

Yes, CVE-2021-47500 has been patched. Fixed versions include 4.4.295, 4.9.293, 4.14.258 and others. If you are running Linux kernel 4.2 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2021-47500 actively exploited?

CVE-2021-47500 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-2021-47500

High

In the Linux kernel, the following vulnerability has been resolved: iio: mma8452: Fix trigger reference couting The mma8452 driver directly assigns a trigger to the struct iio_dev. The IIO core when done using this trigger will call `iio_trigger_put()` to drop the reference count by 1. Without the matching `iio_trigger_get()` in the driver the reference count can reach 0 too early, the trigger gets freed while still in use and a use-after-free occurs. Fix this by getting a reference to the trigger before assigning it to the IIO device.

Package Linux Kernel

Published 2024-05-24

Last modified 2025-01-06

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-2021-47500 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 4.2 and later are affected. Fixed in 4.4.295, 4.9.293, 4.14.258, 4.19.221, 5.4.165, 5.10.85, 5.15.8, 5.16 and their respective stable series.

Affected from

≥ 4.2

Fixed in

✓ 4.4.295 4.4.x ✓ 4.9.293 4.9.x ✓ 4.14.258 4.14.x ✓ 4.19.221 4.19.x ✓ 5.4.165 5.4.x ✓ 5.10.85 5.10.x ✓ 5.15.8 5.15.x ✓ 5.16

References

8 total

Kernel Git
https://git.kernel.org/stable/c/094d513b78b1714113bc016684b8142382e071ba

Patch
Kernel Git
https://git.kernel.org/stable/c/794c0898f6bf39a458655d5fb4af70ec43a5cfcb

Patch
Kernel Git
https://git.kernel.org/stable/c/acf0088ac073ca6e7f4cad6acac112177e08df5e

Patch
Kernel Git
https://git.kernel.org/stable/c/c43517071dfc9fce34f8f69dbb98a86017f6b739

Patch
Kernel Git
https://git.kernel.org/stable/c/cd0082235783f814241a1c9483fb89e405f4f892

Patch

Showing 5 of 8 references View all on NVD

Details

CVE ID CVE-2021-47500

Severity High

CVSS score 7.8 / 10

CVSS version 3.1

Published 2024-05-24

Modified 2025-01-06

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2021-47500?

CVE-2021-47500 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 4.2 onward and has been patched in 4.4.295, 4.9.293, 4.14.258 and others. CVE-2021-47500 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2021-47500?

CVE-2021-47500 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-2021-47500?

Yes. CVE-2021-47500 has been patched. Fixed versions include 4.4.295, 4.9.293, 4.14.258 and others. If you are running Linux kernel 4.2 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2021-47500 actively exploited?

No. CVE-2021-47500 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.