mptcp: allow subflow rcv wnd to shrink (Linux Linux)

CVE-2026-53183
HIGH 7.5

En bref

Source
NVD
EPSS
EPSS 0.49 % · centile 42 ()
État
PUBLISHED
Publiée
Mise à jour
Attribuée par
Linux
Statut NVD
Modified

Description

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.

Faiblesses (CWE)

  • CWE-400 — Consommation de ressources non maîtrisée (déni de service)

Références

Scores

VersionScoreVecteurÉvalué par
CVSS 3.1HIGH 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HLinux
CVSS 3.1HIGH 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HNVD · 416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Secondary)

Références européennes

Avis du CERT-FR

Configurations affectées (CPE NVD)

Produits affectés

ProduitVersions
Linux · Linuxaffected f3589be0c420a3137e5902d15705ced6a36f3f43 < bf364b0f10b27679140699821f88af7f01e2a6e3 ; affected f3589be0c420a3137e5902d15705ced6a36f3f43 < b1fd13074f22105deec45aa02283e322733e0c2d ; affected f3589be0c420a3137e5902d15705ced6a36f3f43 < aa3861f40ac32706d9e97bfac76984613e278788 ; affected f3589be0c420a3137e5902d15705ced6a36f3f43 < 653245266913f03fcf21cbca68eed5c197a33e52 ; affected f3589be0c420a3137e5902d15705ced6a36f3f43 < c297a4e65c50a2b807d9309b22615080faffa8f3 ; affected f3589be0c420a3137e5902d15705ced6a36f3f43 < da23be77e1292cd611e736c3aa17da633d7ddce7
Linux · Linuxaffected 5.19 ; unaffected 0 < 5.19 ; unaffected 6.1.176 ≤ 6.1.* ; unaffected 6.6.143 ≤ 6.6.* ; unaffected 6.12.94 ≤ 6.12.* ; unaffected 6.18.36 ≤ 6.18.*

Sources

SourceLicence
CVE List (CVEProject cvelistV5)CVE Program Terms of Use
EPSS (FIRST.org)FIRST — attribution requested
ENISA EUVDENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feedsPublic domain — this product uses data from the NVD API but is not endorsed or certified by the NVD