ipmi: Fix user refcount underflow in event delivery
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.
- Products
- Kernel
- Affected versions
- Not specified
- Fixed versions
- 6.18.40, 7.1.5
- CVEs
- CVE-2026-72042
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 28 Oct 2026, 08:57 UTC · Revision 1
Source evidence
ipmi: Fix user refcount underflow in event delivery
core-osv · Original sourcePublished 15 Aug 2026, 05:52 UTC
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.
osv:CVE-2026-72042
Kernel
Fixed versions: 6.18.40, 7.1.5
Complete source record
{
"id": "318473417a3a4438bc71ea88f300c7e327409a9769d347b4d8107aa1e96af07c",
"url": "https://osv.dev/vulnerability/CVE-2026-72042",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "ipmi: Fix user refcount underflow in event delivery",
"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.",
"evidence": "osv:CVE-2026-72042",
"products": [
{
"name": {
"value": "Kernel",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "6.18.40",
"evidence": "/affected/1/ranges"
},
{
"value": "7.1.5",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": []
}
],
"severity": "high",
"structured": {
"id": "CVE-2026-72042",
"aliases": [
"CVE-2026-72042"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"type": "GIT",
"events": [
{
"introduced": "b52da4054ee0bf9ecb44996f2c83236ff50b3812"
},
{
"fixed": "ddbb6e3dc9bb4743de686aa1598c31e745cee76b"
},
{
"fixed": "7be349d4fcc5e065295b83418a22d27a68afbdb6"
},
{
"fixed": "6aa9e61c46465d231e9beddf56af7effd71be682"
}
]
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"type": "GIT",
"events": [
{
"introduced": "6.1.157"
},
{
"fixed": "6.2"
}
]
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"type": "GIT",
"events": [
{
"introduced": "6.6.113"
},
{
"fixed": "6.7"
}
]
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"type": "GIT",
"events": [
{
"introduced": "6.12.54"
},
{
"fixed": "6.13"
}
]
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"type": "GIT",
"events": [
{
"introduced": "6.17.4"
},
{
"fixed": "6.18"
}
]
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"type": "GIT",
"events": [
{
"introduced": "f63723ca7d7623f9dae1990973cd158671f03c56"
}
]
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"type": "GIT",
"events": [
{
"introduced": "348121b29594d42d1635648fd3ed31dfa25351d5"
}
]
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"type": "GIT",
"events": [
{
"introduced": "53d6e403affbf6df2c859a0ea00ccfc1e72090ca"
}
]
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"type": "GIT",
"events": [
{
"introduced": "0ed73be9a2547ffb9b5c1d879ad9bfab73d920b5"
}
]
}
],
"versions": [
"v6.1.189",
"v6.1.188",
"v6.1.187",
"v6.1.186",
"v6.1.185",
"v6.1.184",
"v6.1.183",
"v6.1.182",
"v6.1.181",
"v6.1.180",
"v6.1.179",
"v6.1.178",
"v6.1.177",
"v6.1.176",
"v6.1.175",
"v6.1.174",
"v6.1.173",
"v6.1.172",
"v6.1.171",
"v6.1.170",
"v6.1.169",
"v6.1.168",
"v6.1.167",
"v6.1.166",
"v6.1.165",
"v6.1.164",
"v6.1.163",
"v6.1.162",
"v6.1.161",
"v6.1.160",
"v6.1.159",
"v6.1.158",
"v6.1.157",
"v6.6.158",
"v6.6.157",
"v6.6.156",
"v6.6.155",
"v6.6.154",
"v6.6.153",
"v6.6.152",
"v6.6.151",
"v6.6.150",
"v6.6.149",
"v6.6.148",
"v6.6.147",
"v6.6.146",
"v6.6.145",
"v6.6.144",
"v6.6.143",
"v6.6.142",
"v6.6.141",
"v6.6.140",
"v6.6.139",
"v6.6.138",
"v6.6.137",
"v6.6.136",
"v6.6.135",
"v6.6.134",
"v6.6.133",
"v6.6.132",
"v6.6.131",
"v6.6.130",
"v6.6.129",
"v6.6.128",
"v6.6.127",
"v6.6.126",
"v6.6.125",
"v6.6.124",
"v6.6.123",
"v6.6.122",
"v6.6.121",
"v6.6.120",
"v6.6.119",
"v6.6.118",
"v6.6.117",
"v6.6.116",
"v6.6.115",
"v6.6.114",
"v6.6.113",
"v6.12.112",
"v6.12.111",
"v6.12.110",
"v6.12.109",
"v6.12.108",
"v6.12.107",
"v6.12.106",
"v6.12.105",
"v6.12.104",
"v6.12.103",
"v6.12.102",
"v6.12.101",
"v6.12.100",
"v6.12.99",
"v6.12.98",
"v6.12.97",
"v6.12.96",
"v6.12.95",
"v6.12.94",
"v6.12.93",
"v6.12.92",
"v6.12.91",
"v6.12.90",
"v6.12.89",
"v6.12.88",
"v6.12.87",
"v6.12.86",
"v6.12.85",
"v6.12.84",
"v6.12.83",
"v6.12.82",
"v6.12.81",
"v6.12.80",
"v6.12.79",
"v6.12.78",
"v6.12.77",
"v6.12.76",
"v6.12.75",
"v6.12.74",
"v6.12.73",
"v6.12.72",
"v6.12.71",
"v6.12.70",
"v6.12.69",
"v6.12.68",
"v6.12.67",
"v6.12.66",
"v6.12.65",
"v6.12.64",
"v6.12.63",
"v6.12.62",
"v6.12.61",
"v6.12.60",
"v6.12.59",
"v6.12.58",
"v6.12.57",
"v6.12.56",
"v6.12.55",
"v6.12.54",
"v6.17.13",
"v6.17.12",
"v6.17.11",
"v6.17.10",
"v6.17.9",
"v6.17.8",
"v6.17.7",
"v6.17.6",
"v6.17.5",
"v6.17.4"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-72042.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "6.18.0"
},
{
"fixed": "6.18.40"
}
]
},
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "6.19.0"
},
{
"fixed": "7.1.5"
}
]
}
],
"package": {
"name": "Kernel",
"ecosystem": "Linux"
},
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-72042.json"
}
}
],
"modified": "2026-10-08T02:51:46.465712406Z",
"provider": "osv",
"references": [
"https://git.kernel.org/stable/c/6aa9e61c46465d231e9beddf56af7effd71be682",
"https://git.kernel.org/stable/c/7be349d4fcc5e065295b83418a22d27a68afbdb6",
"https://git.kernel.org/stable/c/ddbb6e3dc9bb4743de686aa1598c31e745cee76b",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72042.json",
"https://nvd.nist.gov/vuln/detail/CVE-2026-72042",
"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
],
"provider_metadata": {
"cna_assigner": "Linux",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72042.json"
}
},
"related_cves": [
{
"value": "CVE-2026-72042",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 98340,
"published_at": "2026-08-15T05:52:01.454+00:00"
}