What is CVE-2021-47087?

CVE-2021-47087 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10, classified as a Release of Invalid Pointer or Reference flaw (CWE-763), affecting Linux kernel versions from 5.4.140 onward and patched in 5.4.169, 5.10.89, 5.15.12 and others. CVE-2021-47087 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2021-47087?

CVE-2021-47087 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-2021-47087?

Yes, CVE-2021-47087 has been patched. Fixed versions include 5.4.169, 5.10.89, 5.15.12 and others. If you are running Linux kernel 5.4.140 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2021-47087 actively exploited?

CVE-2021-47087 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is Release of Invalid Pointer or Reference (CWE-763)?

The product attempts to return a memory resource to the system but calls the wrong release function. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/763.html

CVE-2021-47087

High

In the Linux kernel, the following vulnerability has been resolved: tee: optee: Fix incorrect page free bug Pointer to the allocated pages (struct page *page) has already progressed towards the end of allocation. It is incorrect to perform __free_pages(page, order) using this pointer as we would free any arbitrary pages. Fix this by stop modifying the page pointer.

Package Linux Kernel

Published 2024-03-04

Last modified 2025-01-16

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-763

CVE-2021-47087 is a Release of Invalid Pointer or Reference vulnerability

What is Release of Invalid Pointer or Reference?

The product attempts to return a memory resource to the system but calls the wrong release function. Learn more on MITRE CWE

Affected versions

Linux kernel versions 5.4.140, 5.10.58, 5.13.10, 5.14 and later are affected. Fixed in 5.4.169, 5.10.89, 5.15.12, 5.16 and their respective stable series.

Affected from

≥ 5.4.140 ≥ 5.10.58 ≥ 5.13.10 ≥ 5.14

Fixed in

✓ 5.4.169 5.4.x ✓ 5.10.89 5.10.x ✓ 5.15.12 5.15.x ✓ 5.16

References

4 total

Kernel Git
https://git.kernel.org/stable/c/18549bf4b21c739a9def39f27dcac53e27286ab5

Patch
Kernel Git
https://git.kernel.org/stable/c/806142c805cacd098e61bdc0f72c778a2389fe4a

Patch
Kernel Git
https://git.kernel.org/stable/c/91e94e42f6fc49635f1a16d8ae3f79552bcfda29

Patch
Kernel Git
https://git.kernel.org/stable/c/ad338d825e3f7b96ee542bf313728af2d19fe9ad

Patch

Details

CVE ID CVE-2021-47087

Severity High

CVSS score 7.8 / 10

CVSS version 3.1

Published 2024-03-04

Modified 2025-01-16

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2021-47087?

CVE-2021-47087 is a High severity Linux kernel vulnerability with a CVSS score of 7.8 out of 10 , classified as a Release of Invalid Pointer or Reference flaw (CWE-763) . It affects Linux kernel versions from 5.4.140 onward and has been patched in 5.4.169, 5.10.89, 5.15.12 and others. CVE-2021-47087 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2021-47087?

CVE-2021-47087 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-2021-47087?

Yes. CVE-2021-47087 has been patched. Fixed versions include 5.4.169, 5.10.89, 5.15.12 and others. If you are running Linux kernel 5.4.140 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2021-47087 actively exploited?

No. CVE-2021-47087 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.