Instituto Nacional de ciberseguridad. Sección Incibe
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CVE-2021-47152

Severity CVSS v4.0:
Pending analysis
Type:
CWE-787 Out-of-bounds Write
Publication date:
25/03/2024
Last modified:
13/03/2025

Description

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> mptcp: fix data stream corruption<br /> <br /> Maxim reported several issues when forcing a TCP transparent proxy<br /> to use the MPTCP protocol for the inbound connections. He also<br /> provided a clean reproducer.<br /> <br /> The problem boils down to &amp;#39;mptcp_frag_can_collapse_to()&amp;#39; assuming<br /> that only MPTCP will use the given page_frag.<br /> <br /> If others - e.g. the plain TCP protocol - allocate page fragments,<br /> we can end-up re-using already allocated memory for mptcp_data_frag.<br /> <br /> Fix the issue ensuring that the to-be-expanded data fragment is<br /> located at the current page frag end.<br /> <br /> v1 -&gt; v2:<br /> - added missing fixes tag (Mat)

Impact

Vector 3.x
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS v3.1 Severity and Metrics:

Base Score: 5.50 MEDIUM
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Attack Vector (AV): Local
Attack Complexity (AC): Low
Privileges Required (PR): Low
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): None
Integrity (I): None
Availability (A): High

Base Score 3.x
5.50
Severity 3.x
MEDIUM

Vulnerable products and versions

CPE From Up to
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 5.7 (including) 5.10.42 (excluding)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 5.11 (including) 5.12.9 (excluding)
cpe:2.3:o:linux:linux_kernel:5.13:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.13:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.13:rc3:*:*:*:*:*:*

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools