Vulnerability Details CVE-2021-47132
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 3.6%
CVSS Severity
CVSS v3 Score 7.1
References
Products affected by CVE-2021-47132
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cpe:2.3:o:linux:linux_kernel:5.12
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cpe:2.3:o:linux:linux_kernel:5.12.1
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cpe:2.3:o:linux:linux_kernel:5.12.2
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cpe:2.3:o:linux:linux_kernel:5.12.3
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cpe:2.3:o:linux:linux_kernel:5.12.4
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cpe:2.3:o:linux:linux_kernel:5.12.5
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cpe:2.3:o:linux:linux_kernel:5.12.6
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cpe:2.3:o:linux:linux_kernel:5.12.7
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cpe:2.3:o:linux:linux_kernel:5.12.8
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cpe:2.3:o:linux:linux_kernel:5.12.9
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cpe:2.3:o:linux:linux_kernel:5.13