{"id":"CVE-2026-72042","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-72042","summary":"ipmi: Fix user refcount underflow in event delivery","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nipmi: Fix user refcount underflow in event delivery\n\nipmi_alloc_recv_msg(user) takes the temporary user reference owned by the\nreceive message, and ipmi_free_recv_msg() drops it again. If event delivery\nfails after allocating receive messages for earlier users,\nhandle_read_event_rsp() rolls those messages back with\nipmi_free_recv_msg().\n\nThat rollback path still drops user->refcount explicitly after freeing each\nmessage. The extra put can free a user that remains linked on intf->users,\nso later event delivery may dereference a freed user or trip refcount_t's\naddition-on-zero warning when ipmi_alloc_recv_msg() tries to acquire\nanother reference.\n\nRemove the stale explicit put and the now-dead user assignment. Keep the\nlist_del() and ipmi_free_recv_msg() calls; they are the required rollback\noperations.","published":"2026-08-15T05:52:01.454Z","modified":"2026-08-16T03:48:31.241422942Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"Linux","name":"Kernel","fixedVersion":"6.18.40"}],"fix":null,"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/6aa9e61c46465d231e9beddf56af7effd71be682"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7be349d4fcc5e065295b83418a22d27a68afbdb6"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ddbb6e3dc9bb4743de686aa1598c31e745cee76b"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72042.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-72042"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-16T03:48:31.241422942Z"}}