CVE-2026-72042
HighCVSS 7.8Exploitation Probability (EPSS)
Low risk6th percentile - higher than 6% of all known CVEs
Summary
In the Linux kernel IPMI subsystem, a vulnerability exists where the user refcount is underflowed during event delivery. On delivery failure, the rollback path decrements the refcount excessively, potentially leading to use-after-free or a refcount_t warning.
Risk Assessment
This could lead to a kernel panic or potential privilege escalation in environments using IPMI.
Recommendation
Apply a kernel update containing the fix that removes the redundant put in the rollback path.
Original NVD description (English source)
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.