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

What is CVE-2024-35840?

CVE-2024-35840 is a medium-severity vulnerability in Linux kernel, published on 17 May 2024. It can only be exploited from the same machine or local network, with no action from the victim.

Official 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()

Which versions are affected by CVE-2024-35840?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2024-35840?

Apply the vendor's patch.

Is CVE-2024-35840 being exploited?

There is no known exploitation of CVE-2024-35840 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BELL-CVE-2024-35840, DEBIAN-CVE-2024-35840, GHSA-9268-35c3-9w2w, ROOT-OS-DEBIAN-11-CVE-2024-35840, UBUNTU-CVE-2024-35840.