What’s Vulnerable › Vulnerabilities

CVE-2024-35840: mptcp: use OPTION_MPTCP_MPJ_SYNACK in subflow_finish_connect()

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-05-17 · updated 2026-06-17

Description

In the Linux kernel, the following vulnerability has been resolved: mptcp: use OPTION_MPTCP_MPJ_SYNACK in subflow_finish_connect() subflow_finish_connect() uses four fields (backup, join_id, thmac, none) that may contain garbage unless OPTION_MPTCP_MPJ_SYNACK has been set in mptcp_parse_option()

Affected products

• Linux kernel: from 5.7 before 5.15.148; from 5.16 before 6.1.75; from 6.2 before 6.6.14; from 6.7 before 6.7.2 — fixed in 5.15.148, 6.1.75, 6.6.14, 6.7.2

How to fix

Upgrade to a fixed version: Linux kernel 5.15.148, 6.1.75, 6.6.14, 6.7.2. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/413b913507326972135d2977975dbff8b7f2c453
• https://git.kernel.org/stable/c/51e4cb032d49ce094605f27e45eabebc0408893c
• https://git.kernel.org/stable/c/76e8de7273a22a00d27e9b8b7d4d043d6433416a
• https://git.kernel.org/stable/c/ad3e8f5c3d5c53841046ef7a947c04ad45a20721
• https://git.kernel.org/stable/c/be1d9d9d38da922bd4beeec5b6dd821ff5a1dfeb
• https://git.kernel.org/stable/c/413b913507326972135d2977975dbff8b7f2c453
• https://git.kernel.org/stable/c/51e4cb032d49ce094605f27e45eabebc0408893c
• https://git.kernel.org/stable/c/76e8de7273a22a00d27e9b8b7d4d043d6433416a
• https://git.kernel.org/stable/c/ad3e8f5c3d5c53841046ef7a947c04ad45a20721
• https://git.kernel.org/stable/c/be1d9d9d38da922bd4beeec5b6dd821ff5a1dfeb

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