Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

Go to Calendar     Go to Press Room     Go to Newsletters subscription

Search

CVE-2021-47132

Severity CVSS v4.0:
Pending analysis
Type:
CWE-787 Out-of-bounds Write
Publication date:
15/03/2024
Last modified:
13/03/2025

Description

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> mptcp: fix sk_forward_memory corruption on retransmission<br /> <br /> MPTCP sk_forward_memory handling is a bit special, as such field<br /> is protected by the msk socket spin_lock, instead of the plain<br /> socket lock.<br /> <br /> Currently we have a code path updating such field without handling<br /> the relevant lock:<br /> <br /> __mptcp_retrans() -&gt; __mptcp_clean_una_wakeup()<br /> <br /> Several helpers in __mptcp_clean_una_wakeup() will update<br /> sk_forward_alloc, possibly causing such field corruption, as reported<br /> by Matthieu.<br /> <br /> Address the issue providing and using a new variant of blamed function<br /> which explicitly acquires the msk spin lock.

Impact

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

Base Score: 7.10 HIGH
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/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): High
Integrity (I): None
Availability (A): High

Base Score 3.x
7.10
Severity 3.x
HIGH

Vulnerable products and versions

CPE From Up to
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* 5.12 (including) 5.12.10 (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:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.13:rc4:*:*:*:*:*:*

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


References to Advisories, Solutions, and Tools