What is CVE-2021-47521?

CVE-2021-47521 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 3.2 onward and patched in 4.4.295, 4.9.293, 4.14.258 and others. CVE-2021-47521 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2021-47521?

CVE-2021-47521 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-2021-47521?

Yes, CVE-2021-47521 has been patched. Fixed versions include 4.4.295, 4.9.293, 4.14.258 and others. If you are running Linux kernel 3.2 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2021-47521 actively exploited?

CVE-2021-47521 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-2021-47521

High

In the Linux kernel, the following vulnerability has been resolved: can: sja1000: fix use after free in ems_pcmcia_add_card() If the last channel is not available then "dev" is freed. Fortunately, we can just use "pdev->irq" instead. Also we should check if at least one channel was set up.

Package Linux Kernel

Published 2024-05-24

Last modified 2024-11-21

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-2021-47521 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 3.2 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

≥ 3.2

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/1a295fea90e1acbe80c6d4940f5ff856edcd6bec

Patch
Kernel Git
https://git.kernel.org/stable/c/1dd5b819f7e406dc15bbc7670596ff25261aaa2a

Patch
Kernel Git
https://git.kernel.org/stable/c/3ec6ca6b1a8e64389f0212b5a1b0f6fed1909e45

Patch
Kernel Git
https://git.kernel.org/stable/c/474f9a8534f5f89841240a7e978bafd6e1e039ce

Patch
Kernel Git
https://git.kernel.org/stable/c/923f4dc5df679f678e121c20bf2fd70f7bf3e288

Patch

Showing 5 of 8 references View all on NVD

Details

CVE ID CVE-2021-47521

Severity High

CVSS score 7.8 / 10

CVSS version 3.1

Published 2024-05-24

Modified 2024-11-21

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2021-47521?

CVE-2021-47521 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 3.2 onward and has been patched in 4.4.295, 4.9.293, 4.14.258 and others. CVE-2021-47521 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2021-47521?

CVE-2021-47521 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-2021-47521?

Yes. CVE-2021-47521 has been patched. Fixed versions include 4.4.295, 4.9.293, 4.14.258 and others. If you are running Linux kernel 3.2 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2021-47521 actively exploited?

No. CVE-2021-47521 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.