CVE-2026-72042ipmi: Fix user refcount underflow in event delivery

Official description

In the Linux kernel, the following vulnerability has been resolved: ipmi: Fix user refcount underflow in event delivery ipmi_alloc_recv_msg(user) takes the temporary user reference owned by the receive message, and ipmi_free_recv_msg() drops it again. If event delivery fails after allocating receive messages for earlier users, handle_read_event_rsp() rolls those messages back with ipmi_free_recv_msg(). That rollback path still drops user->refcount explicitly after freeing each message. The extra put can free a user that remains linked on intf->users, so later event delivery may dereference a freed user or trip refcount_t's addition-on-zero warning when ipmi_alloc_recv_msg() tries to acquire another reference. Remove the stale explicit put and the now-dead user assignment. Keep the list_del() and ipmi_free_recv_msg() calls; they are the required rollback operations.

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/ddbb6e3dc9bb4743de686aa1598c31e745cee76b
• https://git.kernel.org/stable/c/7be349d4fcc5e065295b83418a22d27a68afbdb6
• https://git.kernel.org/stable/c/6aa9e61c46465d231e9beddf56af7effd71be682