CVE-2021-47132 Information

Mar 16, 2024 cve

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.

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