What is CVE-2021-47152?

CVE-2021-47152 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10, classified as a Out-of-bounds Write flaw (CWE-787). CVE-2021-47152 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2021-47152?

CVE-2021-47152 has a CVSS score of 5.5 out of 10, rated Medium severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

Is there a patch available for CVE-2021-47152?

No patch is currently available for CVE-2021-47152. Monitor the NIST NVD and your Linux distribution's security advisories for updates.

Is CVE-2021-47152 actively exploited?

CVE-2021-47152 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is Out-of-bounds Write (CWE-787)?

The product writes data past the end or before the beginning of the intended buffer. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/787.html

CVE-2021-47152

Medium

In the Linux kernel, the following vulnerability has been resolved: mptcp: fix data stream corruption Maxim reported several issues when forcing a TCP transparent proxy to use the MPTCP protocol for the inbound connections. He also provided a clean reproducer. The problem boils down to 'mptcp_frag_can_collapse_to()' assuming that only MPTCP will use the given page_frag. If others - e.g. the plain TCP protocol - allocate page fragments, we can end-up re-using already allocated memory for mptcp_data_frag. Fix the issue ensuring that the to-be-expanded data fragment is located at the current page frag end. v1 -> v2: - added missing fixes tag (Mat)

Package Linux Kernel

Published 2024-03-25

Last modified 2025-03-13

CVSS version 3.1

Patch available

Awaiting data

CVSS 3.1 score

5.5

out of 10

Medium

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

High

Vector string

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Weakness type

CWE-787

CVE-2021-47152 is a Out-of-bounds Write vulnerability

What is Out-of-bounds Write?

The product writes data past the end or before the beginning of the intended buffer. Learn more on MITRE CWE

References

The following references provide additional information about CVE-2021-47152 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

Kernel patch commit
https://git.kernel.org/stable/c/18e7f0580da15cac1e79d73683ada5a9e70980f8
Patch
Kernel patch commit
https://git.kernel.org/stable/c/29249eac5225429b898f278230a6ca2baa1ae154
Patch
Kernel patch commit
https://git.kernel.org/stable/c/3267a061096efc91eda52c2a0c61ba76e46e4b34
Patch

Details

CVE ID CVE-2021-47152

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2024-03-25

Modified 2025-03-13

KEV No

Patch Awaiting data

Package linux

Frequently asked questions

What is CVE-2021-47152?

CVE-2021-47152 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 , classified as an Out-of-bounds Write flaw (CWE-787) . CVE-2021-47152 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2021-47152?

CVE-2021-47152 has a CVSS score of 5.5 out of 10, rated Medium severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
Is there a patch available for CVE-2021-47152?

No patch is currently available for CVE-2021-47152. Monitor the NIST NVD and your Linux distribution's security advisories for updates.
Is CVE-2021-47152 actively exploited?

No — CVE-2021-47152 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.
What is Out-of-bounds Write (CWE-787)?

The product writes data past the end or before the beginning of the intended buffer. View CWE-787 on MITRE CWE →