CVE-2026-72042

Summary

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 Software

VendorProductVersion RangeStatus
LinuxLinuxb52da4054ee0bf9ecb44996f2c83236ff50b3812 < ddbb6e3dc9bb4743de686aa1598c31e745cee76baffected
LinuxLinuxb52da4054ee0bf9ecb44996f2c83236ff50b3812 < 7be349d4fcc5e065295b83418a22d27a68afbdb6affected
LinuxLinuxb52da4054ee0bf9ecb44996f2c83236ff50b3812 < 6aa9e61c46465d231e9beddf56af7effd71be682affected
LinuxLinuxf63723ca7d7623f9dae1990973cd158671f03c56affected
LinuxLinux348121b29594d42d1635648fd3ed31dfa25351d5affected
LinuxLinux53d6e403affbf6df2c859a0ea00ccfc1e72090caaffected
LinuxLinux0ed73be9a2547ffb9b5c1d879ad9bfab73d920b5affected
LinuxLinux6.1.157 < 6.2affected
LinuxLinux6.6.113 < 6.7affected
LinuxLinux6.12.54 < 6.13affected
LinuxLinux6.17.4 < 6.18affected
LinuxLinux6.18affected
LinuxLinux0 < 6.18unaffected
LinuxLinux6.18.40 <= 6.18.*unaffected
LinuxLinux7.1.5 <= 7.1.*unaffected
LinuxLinux7.2 <= *unaffected

Weaknesses

References