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CVE-2026-97524

mptcp: avoid unneeded actions on subflow reset

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.271, 5.15.222, 6.1.189, 6.6.158, 6.12, and 3 more
None on Exploit-DB, Metasploit or GitHub

Summary

In the Linux kernel, the following vulnerability has been resolved: mptcp: avoid unneeded actions on subflow reset Once in a blue moon, the mptcp receive path can recursively call mptcp_data_ready() via state change under unlucky error conditions, and then try to hold the data lock again. Break the recursion loop explicitly checking for the exceptional condition. Add a new flag instead of using an existing one like 'closing', to exit early in subflow_state_change(), and explicitly flush the RX queue at reset time. This avoids unneeded processing to check for available data -- calling get_mapping_status() and more on a dying subflow -- but also in error reporting and worker scheduling. Note that we must consume the currently peeked skb before invoking mptcp_dss_corruption to avoid consuming it again after the eventual reset has freed it.

Timeline

  1. CVE published
  2. Record last updated

Affected versions

  • Linux Linux

    From fde99e972b8f88cebe619241d7aa43d288ef666a · fixed in 6d669c740933124eae3df8cfc15995af9bcc6aba; From 12c1676d598e3b8dd92a033b623b792cc2ea1ec5 · fixed in 83a7dcdd2b1060484528da70a643125174d47e5a; From 35668f8ec84f6c944676e48ecc6bbc5fc8e6fe25 · fixed in a370e56024df0b07e3120c45a9773ae123819fd6; From b8be15d1ae7ea4eedd547c3b3141f592fbddcd30 · fixed in 1962841387087970d75ba8b8d4c2aa2d45705e50; From e32d262c89e2b22cb0640223f953b548617ed8a6 · fixed in 4b7abdcb5ba832fafab679f0d998af39cbc99307; From e32d262c89e2b22cb0640223f953b548617ed8a6 · fixed in b2dbcc1ed48b5ac070a41db4a52aade6823c4df0; From e32d262c89e2b22cb0640223f953b548617ed8a6 · fixed in ce7e4ede01ed3e47a48c0f1ce1d87bf4864bee9f; From e32d262c89e2b22cb0640223f953b548617ed8a6 · fixed in 2b0f561f21b27c40c91ea4975268a06092bd7e9c; From 5.10.228 · fixed in 5.10.271; From 5.15.169 · fixed in 5.15.222; From 6.1.113 · fixed in 6.1.189; From 6.6.57 · fixed in 6.6.158; From 6.11.4 · fixed in 6.12

  • Linux Linux

    6.12

  • KernelLinux

    fixed in 5.10.271; From 5.11.0 · fixed in 5.15.222; From 5.16.0 · fixed in 6.1.189; From 6.2.0 · fixed in 6.6.158; From 6.7.0 · fixed in 6.12.111; From 6.12.0 · fixed in 6.18.53; From 6.13.0 · fixed in 7.2.7

References 8

git.kernel.org