{"id":"CVE-2021-47132","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nmptcp: fix sk_forward_memory corruption on retransmission\n\nMPTCP sk_forward_memory handling is a bit special, as such field\nis protected by the msk socket spin_lock, instead of the plain\nsocket lock.\n\nCurrently we have a code path updating such field without handling\nthe relevant lock:\n\n__mptcp_retrans() -\u003e __mptcp_clean_una_wakeup()\n\nSeveral helpers in __mptcp_clean_una_wakeup() will update\nsk_forward_alloc, possibly causing such field corruption, as reported\nby Matthieu.\n\nAddress the issue providing and using a new variant of blamed function\nwhich explicitly acquires the msk spin lock.","modified":"2026-03-14T08:43:08.536409Z","published":"2024-03-15T21:15:07.690Z","references":[{"type":"FIX","url":"https://git.kernel.org/stable/c/b5941f066b4ca331db225a976dae1d6ca8cf0ae3"},{"type":"FIX","url":"https://git.kernel.org/stable/c/b9c78b1a95966a7bd2ddae05b73eafc0cda4fba3"}],"affected":[{"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-47132.json","unresolved_ranges":[{"events":[{"introduced":"5.12"},{"fixed":"5.12.10"}]},{"events":[{"introduced":"0"},{"last_affected":"5.13-rc1"}]},{"events":[{"introduced":"0"},{"last_affected":"5.13-rc2"}]},{"events":[{"introduced":"0"},{"last_affected":"5.13-rc3"}]},{"events":[{"introduced":"0"},{"last_affected":"5.13-rc4"}]}]}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H"}]}