CVE-2026-72383

Summary

In the Linux kernel, the following vulnerability has been resolved:

sctp: fix addr_wq_timer race in sctp_free_addr_wq()

sctp_free_addr_wq() previously removed addr_wq_timer using timer_delete() while holding addr_wq_lock. However, timer_delete() does not guarantee that a currently running timer handler has completed.

This allows a race with sctp_addr_wq_timeout_handler(), where the handler may still run after addr_waitq has been freed, acquire addr_wq_lock, and access freed memory, leading to a use-after-free.

Fix this by calling timer_shutdown_sync() before taking addr_wq_lock. This guarantees that any in-flight timer handler has finished and prevents the timer from being re-armed during teardown, making subsequent cleanup safe.

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/a8323fb2ab6cd6978f359daeed6688e0cadf32ba
• https://git.kernel.org/stable/c/c3e5cac47519d77ad36b9c03a1df1536aaa0c4a1
• https://git.kernel.org/stable/c/976c19de0f22a857ba0112f39635f8fd7a257568

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