CVE-2026-72042

/// Technical 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.

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References