SB20260529128 - Improper resource shutdown or release in Linux kernel mptcp

Description

This security bulletin contains information about 1 vulnerability.

1) Improper resource shutdown or release (CVE-ID: CVE-2026-46170)

CWE-ID: CWE-404 - Improper Resource Shutdown or Release

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to improper resource shutdown or release in the mptcp path manager ADD_ADDR retransmission timer handling when processing ADD_ADDR retransmissions. A local user can trigger ADD_ADDR retransmissions to cause a system hang.

The issue occurs when the last socket reference is released from the timer handler, leading to an indefinite wait on the same timer.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/8143a224785ceaf2b0856e08d4498916f38228fb
• https://git.kernel.org/stable/c/b74ad20198652b6b39a761c277ba65ae82b1e107
• https://git.kernel.org/stable/c/b7b9a461569734d33d3259d58d2507adfac107ed