What is CVE-2021-47200?

CVE-2021-47200 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 5.5 onward and patched in 5.15.5 and 5.16. CVE-2021-47200 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2021-47200?

CVE-2021-47200 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-2021-47200?

Yes, CVE-2021-47200 has been patched. Fixed versions include 5.15.5 and 5.16. If you are running Linux kernel 5.5 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2021-47200 actively exploited?

CVE-2021-47200 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-2021-47200

High

In the Linux kernel, the following vulnerability has been resolved: drm/prime: Fix use after free in mmap with drm_gem_ttm_mmap drm_gem_ttm_mmap() drops a reference to the gem object on success. If the gem object's refcount == 1 on entry to drm_gem_prime_mmap(), that drop will free the gem object, and the subsequent drm_gem_object_get() will be a UAF. Fix by grabbing a reference before calling the mmap helper. This issue was forseen when the reference dropping was adding in commit 9786b65bc61ac ("drm/ttm: fix mmap refcounting"): "For that to work properly the drm_gem_object_get() call in drm_gem_ttm_mmap() must be moved so it happens before calling obj->funcs->mmap(), otherwise the gem refcount would go down to zero."

Package Linux Kernel

Published 2024-04-10

Last modified 2025-01-07

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-2021-47200 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 5.5 and later are affected. Fixed in 5.15.5, 5.16 and their respective stable series.

Affected from

≥ 5.5

Fixed in

✓ 5.15.5 5.15.x ✓ 5.16

References

2 total

Kernel Git
https://git.kernel.org/stable/c/4f8e469a2384dfa4047145b0093126462cbb6dc0

Patch
Kernel Git
https://git.kernel.org/stable/c/8244a3bc27b3efd057da154b8d7e414670d5044f

Patch

Details

CVE ID CVE-2021-47200

Severity High

CVSS score 7.8 / 10

CVSS version 3.1

Published 2024-04-10

Modified 2025-01-07

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2021-47200?

CVE-2021-47200 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 5.5 onward and has been patched in 5.15.5 and 5.16. CVE-2021-47200 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2021-47200?

CVE-2021-47200 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-2021-47200?

Yes. CVE-2021-47200 has been patched. Fixed versions include 5.15.5 and 5.16. If you are running Linux kernel 5.5 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2021-47200 actively exploited?

No. CVE-2021-47200 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.