SB20260928367 - Incomplete cleanup in Linux kernel mptcp

Description

This security bulletin contains information about 1 vulnerability.

1) Incomplete cleanup (CVE-ID: CVE-2026-97566)

CWE-ID: CWE-459 - Incomplete cleanup

CVSSv4: 0 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]

The vulnerability allows a local user to trigger a kernel warning.

The vulnerability exists due to incomplete cleanup in the in-kernel MPTCP path manager's id 0 endpoint removal path when removing an id 0 endpoint while an ADD_ADDR announcement is pending. A local user can remove the id 0 endpoint while a pending ADD_ADDR announcement exists to trigger a kernel warning.

The warning is triggered when the path manager subsequently reselects id 0 after another signal endpoint is added.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/2ac7d6e620764f1fc79eb4edd3610a7a661981ca
• https://git.kernel.org/stable/c/545616b4e7325be3c61fc082538cb06d14f7b1db
• https://git.kernel.org/stable/c/d4a67a880654e1bfe318a31bea0bdbb026a09ade