Description (CNA)
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 (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected b52da4054ee0bf9ecb44996f2c83236ff50b3812 before ddbb6e3dc9bb4743de686aa1598c31e745cee76b; affected b52da4054ee0bf9ecb44996f2c83236ff50b3812 before 7be349d4fcc5e065295b83418a22d27a68afbdb6; affected b52da4054ee0bf9ecb44996f2c83236ff50b3812 before 6aa9e61c46465d231e9beddf56af7effd71be682; affected f63723ca7d7623f9dae1990973cd158671f03c56; affected 348121b29594d42d1635648fd3ed31dfa25351d5; affected 53d6e403affbf6df2c859a0ea00ccfc1e72090ca; affected 0ed73be9a2547ffb9b5c1d879ad9bfab73d920b5; affected 6.1.157 before 6.2; affected 6.6.113 before 6.7; affected 6.12.54 before 6.13; affected 6.17.4 before 6.18 |
| Linux / Linux | affected 6.18; unaffected 0 before 6.18; unaffected 6.18.40 through 6.18.*; unaffected 7.1.5 through 7.1.*; unaffected 7.2 through * |
CWE
No CWE identifiers supplied.