mptcp: allow subflow rcv wnd to shrink
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 6.1.176, 6.6.143, 6.12.94, 6.18.36, 7.0.13
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
- Exploitation: none
- Automatable: yes
- Technical impact: partial
Summary
In the Linux kernel, the following vulnerability has been resolved: mptcp: allow subflow rcv wnd to shrink In MPTCP connection, the `window` field in the TCP header refers to the MPTCP-level rcv_nxt and it's right edge should not move backward. Such constraint is enforced at DSS option generation time. At the same time, the TCP stack ensures independently that the TCP-level rcv wnd right's edge does not move backward. That in turn causes artificial inflating of the MPTCP rcv window when the incoming data is acked at the TCP level and is OoO in the MPTCP sequence space (or lands in the backlog). As a consequence, the incoming traffic can exceed the receiver rcvbuf size even when the sender is not misbehaving. Prevent such scenario forcibly allowing the TCP subflow to shrink the TCP-level rcv wnd regardless of the current netns setting.
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: yes · Technical impact: partial
- Record last updated
Affected versions
- Linux Linux
From f3589be0c420a3137e5902d15705ced6a36f3f43 · fixed in bf364b0f10b27679140699821f88af7f01e2a6e3; From f3589be0c420a3137e5902d15705ced6a36f3f43 · fixed in b1fd13074f22105deec45aa02283e322733e0c2d; From f3589be0c420a3137e5902d15705ced6a36f3f43 · fixed in aa3861f40ac32706d9e97bfac76984613e278788; From f3589be0c420a3137e5902d15705ced6a36f3f43 · fixed in 653245266913f03fcf21cbca68eed5c197a33e52; From f3589be0c420a3137e5902d15705ced6a36f3f43 · fixed in c297a4e65c50a2b807d9309b22615080faffa8f3; From f3589be0c420a3137e5902d15705ced6a36f3f43 · fixed in da23be77e1292cd611e736c3aa17da633d7ddce7
- Linux Linux
5.19
- KernelLinux
From 5.19.0 · fixed in 6.1.176; From 6.2.0 · fixed in 6.6.143; From 6.7.0 · fixed in 6.12.94; From 6.13.0 · fixed in 6.18.36; From 6.19.0 · fixed in 7.0.13