Description
In the Linux kernel, the following vulnerability has been resolved:

mptcp: fix sk_forward_memory corruption on retransmission

MPTCP sk_forward_memory handling is a bit special, as such field
is protected by the msk socket spin_lock, instead of the plain
socket lock.

Currently we have a code path updating such field without handling
the relevant lock:

__mptcp_retrans() -> __mptcp_clean_una_wakeup()

Several helpers in __mptcp_clean_una_wakeup() will update
sk_forward_alloc, possibly causing such field corruption, as reported
by Matthieu.

Address the issue providing and using a new variant of blamed function
which explicitly acquires the msk spin lock.
Published: 2024-03-15
Score: 7.1 High
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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History

Thu, 13 Mar 2025 21:45:00 +0000

Type Values Removed Values Added
First Time appeared Linux
Linux linux Kernel
Weaknesses CWE-787
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
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:*:*:*:*:*:*
Vendors & Products Linux
Linux linux Kernel

Subscriptions

Linux Linux Kernel
cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2026-05-11T13:48:40.100Z

Reserved: 2024-03-04T18:12:48.840Z

Link: CVE-2021-47132

cve-icon Vulnrichment

Updated: 2024-08-04T05:24:40.145Z

cve-icon NVD

Status : Analyzed

Published: 2024-03-15T21:15:07.690

Modified: 2025-03-13T21:24:27.137

Link: CVE-2021-47132

cve-icon Redhat

Severity : Moderate

Publid Date: 2024-03-15T00:00:00Z

Links: CVE-2021-47132 - Bugzilla

cve-icon OpenCVE Enrichment

No data.

Weaknesses