{"metadata": {"vulnerability": "CVE-2026-99133", "count": 33, "kinds": {"milestone": 10, "sighting": 1, "kev": 0, "other": 22}, "linked_omitted": 0}, "data": [{"timestamp": "2026-09-25T10:25:14.394Z", "date_only": false, "value": "2026-09-25T10:25:14.394Z", "kind": "milestone", "label": "Reserved", "source": "cvelistv5", "record": "CVE-2026-99133", "field": "cveMetadata.dateReserved"}, {"timestamp": "2026-10-28T10:34:46.398Z", "date_only": false, "value": "2026-10-28T10:34:46.398Z", "kind": "milestone", "label": "Published", "source": "cvelistv5", "record": "CVE-2026-99133", "field": "cveMetadata.datePublished", "metric_role": "disclosure", "metric_basis": "recorded_event"}, {"timestamp": "2026-10-28T11:06:06.165Z", "date_only": false, "value": "2026-10-28T11:06:06.165880Z", "kind": "sighting", "label": "Seen", "source": "https://infosec.exchange/users/cve/statuses/117518209232743724", "record": "CVE-2026-99133", "field": "creation_timestamp", "uuid": "a8171683-598c-46b9-ac7a-3d2ba3fbc37c", "content": "CVE-2026-99133 net/iucv: fix the recvmsg window update In the Linux kernel, the following vulnerability has been resolved:\nnet/iucv: fix the recvmsg window update\niucv_sock_recvmsg() sends the HiperSockets-only AF_IUCV_FLAG_WIN withouttesting the transport, so on a classic z/VM socket iucv_send_ctrl() sizesthe skb through a NULL iucv->hs_dev. SO_MSGLIMIT accepts 1, so msglimit / 2is zero and one recvmsg() on its own socket is enough for an unprivilegedprocess to take a spurious disconnect.\nIt also calls iucv_send_ctrl() under spin_lock_bh(&message_q.lock), whichallocates GFP_KERNEL inside a section the code treats as atomic. Sendingoutside that lock lets two recvmsg() reach afiucv_hs_send() at once, wheremsg_recv is sampled for the advertised window and subtracted afterdev_queue_xmit() -- and sendmsg reaches that counter under lock_sock()while recvmsg holds no socket lock, so both can subtract the same value,the counter goes negative and the credit reaches the peer twice.\nTest the transport, claim the credit with atomic_xchg() after the lasterror exit and hand it back if the transmit fails, and send once the lockis dropped.\nhttps://www.cve.org/CVERecord?id=CVE-2026-99133https://git.kernel.org/stable/c/8f2efa742f4cfe7dd756154f8bc07350dbe3ec92https://git.kernel.org/stable/c/fe7393a627db2d093e8c0cae69d619b30fefae5fhttps://git.kernel.org/stable/c/fa5acd038ea657ad5033713d6916214cbd349151#kernel #Linux#CVE_2026_99133#bot", "url": "https://infosec.exchange/users/cve/statuses/117518209232743724"}, {"timestamp": "2026-10-28T11:17:00Z", "date_only": false, "value": "2026-10-28T11:17:00Z", "kind": "milestone", 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