Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: mptcp: do not account for OoO in mptcp_rcvbuf_grow() MPTCP-level OoOs are physiological when multiple subflows are active concurrently and will not cause retransmissions nor are caused by drops. Accounting for them in mptcp_rcvbuf_grow() causes the rcvbuf slowly drifting towards tcp_rmem[2]. Remove such accounting. Note that subflows will still account for TCP-level OoO when the MPTCP-level rcvbuf is propagated. This also closes a subtle and very unlikely race condition with rcvspace init; active sockets with user-space holding the msk-level socket lock, could complete such initialization in the receive callback, after that the first OoO data reaches the rcvbuf and potentially triggering a divide by zero Oops.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected e118cdc34dd109562b64f6a397f68cd33b041d5b before fb7bf00b04a6b48859f52035d4e745848c2b4c79; affected e118cdc34dd109562b64f6a397f68cd33b041d5b before 400ee4854adef1e4983812a3decf6717ea020136; affected e118cdc34dd109562b64f6a397f68cd33b041d5b before 6b329393502e5857662b851a13f947209c588587 |
| Linux / Linux | affected 6.18; unaffected 0 before 6.18; unaffected 6.18.14 through 6.18.*; unaffected 6.19.4 through 6.19.*; unaffected 7.0 through * |
CWE
No CWE identifiers supplied.