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Permalink CVE-2026-63867
8.2 HIGH
  • CVSS version (CVSS): 3.1
  • Attack Vector (AV): Network (N)
  • Attack Complexity (AC): Low (L)
  • Privileges Required (PR): None (N)
  • User Interaction (UI): None (N)
  • Scope (S): Unchanged (U)
  • Confidentiality (C): None (N)
  • Integrity (I): Low (L)
  • Availability (A): High (H)
  • Modified Attack Vector (MAV): Network (N)
  • Modified Attack Complexity (MAC): Low (L)
  • Modified Privileges Required (MPR): None (N)
  • Modified User Interaction (MUI): None (N)
  • Modified Confidentiality (MC): None (N)
  • Modified Scope (MS): Unchanged (U)
  • Modified Integrity (MI): Low (L)
  • Modified Availability (MA): High (H)
created 6 days, 5 hours ago Activity log
  • Created & dismissed (max. allowed matches exceeded) suggestion 6 days, 5 hours ago
mptcp: close TOCTOU race while computing rcv_wnd

In the Linux kernel, the following vulnerability has been resolved: mptcp: close TOCTOU race while computing rcv_wnd The MPTCP output path access locklessly the MPTCP-level ack_seq in multiple times, using possibly different values for the data_ack in the DSS option and to compute the announced rcv wnd for the same packet. Refactor the cote to avoid inconsistencies which may confuse the peer. Also ensure that the MPTCP level rcv wnd is updated only when the egress packet actually contains a DSS ack.

Affected products

Linux
  • <8f4f0a157e8436a05bf8c3670b24dbc258911c43
  • <301a33fd590c408a05c5df800e0cc1e6a8a2f8f8
  • <907ac6b1658e0277f979fcdfae2a753b495c1510
  • ==5.11
  • =<6.18.*
  • <c4f4cf60797974873dbc8e100144682a6f2f861f
  • =<7.0.*
  • =<6.12.*
  • <8ab24fdebc369c0dfb90f82c1650b1e66662bb45
  • =<6.1.*
  • =<*
  • =<6.6.*
  • <68364963e5baf03f16b4420292291f75c8f66497
  • =<5.15.*
  • <3b8cbba7c0ed31189c89f90be247b8973ffa79ef
  • <5.11