SB2025072941 - Input validation error in Linux kernel mptcp

Description

This security bulletin contains information about 1 security vulnerability.

1) Input validation error (CVE-ID: CVE-2025-38491)

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to improper input validation within the subflow_finish_connect(), WRITE_ONCE(), __mptcp_subflow_connect() and subflow_state_change() functions in net/mptcp/subflow.c, within the mptcp_check_data_fin(), __mptcp_finish_join(), mptcp_update_infinite_map(), mptcp_check_fastclose(), __mptcp_retrans(), __mptcp_init_sock() and mptcp_finish_join() functions in net/mptcp/protocol.c, within the check_fully_established() function in net/mptcp/options.c. A local user can perform a denial of service (DoS) attack.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/1d82a8fe6ee4afdc92f4e8808c9dad2a6095bbc5
• https://git.kernel.org/stable/c/54999dea879fecb761225e28f274b40662918c30
• https://git.kernel.org/stable/c/f8a1d9b18c5efc76784f5a326e905f641f839894