CVE-2026-63972

Summary

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

net: mana: Skip redundant detach on already-detached port

When mana_per_port_queue_reset_work_handler() runs after a previous detach succeeded but attach failed, the port is left in a detached state with apc->tx_qp and apc->rxqs already freed. Calling mana_detach() again unconditionally leads to NULL pointer dereferences during queue teardown.

Add an early exit in mana_detach() when the port is already in detached state (!netif_device_present) for non-close callers, making it safe to call idempotently. This allows the queue reset handler and other recovery paths to simply retry mana_attach() without redundant teardown.

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/c4152b4e28b3e550ec99351bf900e2c24c2608cc
• https://git.kernel.org/stable/c/7ae590797f9b5c240aaea5773f5f00977a42a846
• https://git.kernel.org/stable/c/5b05aa36ee24297d7296ca58dfd8c448d0e4cda3

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