What is CVE-2021-47334?

CVE-2021-47334 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 2.6.16 onward and patched in 4.4.276, 4.9.276, 4.14.240 and others. CVE-2021-47334 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2021-47334?

CVE-2021-47334 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-2021-47334?

Yes, CVE-2021-47334 has been patched. Fixed versions include 4.4.276, 4.9.276, 4.14.240 and others. If you are running Linux kernel 2.6.16 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2021-47334 actively exploited?

CVE-2021-47334 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-2021-47334

High

In the Linux kernel, the following vulnerability has been resolved: misc/libmasm/module: Fix two use after free in ibmasm_init_one In ibmasm_init_one, it calls ibmasm_init_remote_input_dev(). Inside ibmasm_init_remote_input_dev, mouse_dev and keybd_dev are allocated by input_allocate_device(), and assigned to sp->remote.mouse_dev and sp->remote.keybd_dev respectively. In the err_free_devices error branch of ibmasm_init_one, mouse_dev and keybd_dev are freed by input_free_device(), and return error. Then the execution runs into error_send_message error branch of ibmasm_init_one, where ibmasm_free_remote_input_dev(sp) is called to unregister the freed sp->remote.mouse_dev and sp->remote.keybd_dev. My patch add a "error_init_remote" label to handle the error of ibmasm_init_remote_input_dev(), to avoid the uaf bugs.

Package Linux Kernel

Published 2024-05-21

Last modified 2024-12-26

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-2021-47334 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 2.6.16 and later are affected. Fixed in 4.4.276, 4.9.276, 4.14.240, 4.19.198, 5.4.134, 5.10.52, 5.12.19, 5.13.4, 5.14 and their respective stable series.

Affected from

≥ 2.6.16

Fixed in

✓ 4.4.276 4.4.x ✓ 4.9.276 4.9.x ✓ 4.14.240 4.14.x ✓ 4.19.198 4.19.x ✓ 5.4.134 5.4.x ✓ 5.10.52 5.10.x ✓ 5.12.19 5.12.x ✓ 5.13.4 5.13.x ✓ 5.14

References

9 total

Kernel Git
https://git.kernel.org/stable/c/1512e7dc5eb08b7d92a12e2bfcd9cb8c4a1ec069

Patch
Kernel Git
https://git.kernel.org/stable/c/29ba8e2ba89ee2862a26d91204dd5fe77ceee25a

Patch
Kernel Git
https://git.kernel.org/stable/c/38660031e80eaa6cc9370b031c180612f414b00d

Patch
Kernel Git
https://git.kernel.org/stable/c/481a76d4749ee3a27f902ba213fdcbb4bb39720e

Patch
Kernel Git
https://git.kernel.org/stable/c/5b06ca113bf197aab2ab61288f42506e0049fbab

Patch

Showing 5 of 9 references View all on NVD

Details

CVE ID CVE-2021-47334

Severity High

CVSS score 7.8 / 10

CVSS version 3.1

Published 2024-05-21

Modified 2024-12-26

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2021-47334?

CVE-2021-47334 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 2.6.16 onward and has been patched in 4.4.276, 4.9.276, 4.14.240 and others. CVE-2021-47334 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2021-47334?

CVE-2021-47334 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-2021-47334?

Yes. CVE-2021-47334 has been patched. Fixed versions include 4.4.276, 4.9.276, 4.14.240 and others. If you are running Linux kernel 2.6.16 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2021-47334 actively exploited?

No. CVE-2021-47334 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.