CVE-2026-98870

Что произошло

In the Linux kernel, the following vulnerability has been resolved: ksmbd: remove stale channels from all sessions on teardown ksmbd_sessions_deregister() removes a connection's channels from other sessions' channel lists only while conn->binding is still set: if (conn->binding) { hash_for_each_safe(sessions_table, ...) ksmbd_chann_del(conn, sess); } conn->binding is a transient flag: it is cleared once a binding SESSION_SETUP completes, and also by a subsequent non-binding SESSION_SETUP on the same connection (a reauthentication on a bound channel, or a new SessionId==0 setup). A connection that has bound a channel into another session's ksmbd_chann_list and then clears conn->binding leaves that channel behind when it disconnects: the channel, whose chann->conn points at the now freed struct ksmbd_conn, stays on the owner session's list. When the owning connection later tears down, the second loop dereferences the stale channel: xa_for_each(&sess->ksmbd_chann_list, chann_id, chann) if (chann->conn != conn) ksmbd_conn_set_exiting(chann->conn); /* freed */ which is a use-after-free write into the freed ksmbd_conn (the same stale channel is also walked by show_proc_session() through /proc). The session is leaked as well, because its channel list never empties. Remove the conn->binding gate so a connection always removes its channels from every session on teardown.

Что делать

dpkg-query -W -f='${Package}	${Version}\n'

rpm -qa --qf '%{NAME}\t%{VERSION}-%{RELEASE}\n'

Get-HotFix | Select-Object HotFixID, InstalledOn

Продукты и затронутые версии

{
  "status": "affected",
  "version": "b1b6ed903a6e2b3505a48706bcd499b447ef9e44",
  "lessThan": "f8200bb4994e65a2e5c5b314789eeae39078619d",
  "versionType": "git"
}

{
  "status": "affected",
  "version": "47b018dba6ec7ebf403fd2d1e713bc7acc9bbb23",
  "lessThan": "9cd6d714d3ca0cff296542dc989696884e41970f",
  "versionType": "git"
}

{
  "status": "affected",
  "version": "9ef4dfd5edbd02f4bf10cd420a30896093d98a67",
  "lessThan": "b145f9b56c87f9c23ad5464ab0844dbc1de12b36",
  "versionType": "git"
}

{
  "status": "affected",
  "version": "5a5b0b7a01fe19b383b3c046546b5ae30c1a7d71",
  "lessThan": "a15cae16f4432a5ad919ee633e31b07178492955",
  "versionType": "git"
}

{
  "status": "affected",
  "version": "faf8578c77f3d846aca9cd882c293e03eafcc6df",
  "lessThan": "b10665730fbf6b5e45fe422badcbbc3f0df96ef5",
  "versionType": "git"
}

{
  "status": "affected",
  "version": "e632f21a8bc0c59abc4960482836ac3782db93c0",
  "versionType": "git"
}

{
  "status": "affected",
  "version": "5.15.222",
  "lessThan": "5.16",
  "versionType": "semver"
}

CVSS: оценки и векторы

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Источники и ссылки

{
  "cwes": [],
  "epss": {
    "source": "epss",
    "received_at": "2026-11-01T21:13:22.690209+00:00"
  },
  "title": {
    "source": "cve",
    "received_at": "2026-10-28T20:13:06.613122+00:00"
  },
  "scores": [
    "cve"
  ],
  "status": {
    "source": "cve",
    "received_at": "2026-10-28T20:13:06.613122+00:00"
  },
  "affected": [
    "cve"
  ],
  "published": {
    "source": "cve",
    "received_at": "2026-10-28T20:13:06.613122+00:00"
  },
  "solutions": [],
  "percentile": {
    "source": "epss",
    "received_at": "2026-11-01T21:13:22.690209+00:00"
  },
  "references": [
    "cve"
  ],
  "description": {
    "source": "cve",
    "received_at": "2026-10-28T20:13:06.613122+00:00"
  },
  "workarounds": [],
  "configurations": []
}

Хронология записи

1. Данные обновлены02.11.2026, 00:13
2. Данные обновлены31.10.2026, 12:00
3. Данные обновлены29.10.2026, 12:47
4. Опубликована28.10.2026, 23:13

Личная заметка и статус

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