{
  "cveId": "CVE-2026-90414",
  "url": "https://patchblox.com/security/cve/CVE-2026-90414",
  "summary": "CVE-2026-90414 is fixed in 53 products on 1 platform, first by DEBIAN-CVE-2026-90414, released September 23, 2026. It is not reported as exploited. Patch Radar priority: Urgent.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  IB/isert: reject PDUs declaring more data than w...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  IB/isert: reject PDUs declaring more data than was received  isert_recv_done() hands each received PDU to the opcode handlers without ever looking at wc-\u003Ebyte_len, the number of bytes the HCA actually placed in the receive descriptor. The handlers then copy that many bytes - the data-segment length the initiator declared in the BHS (ntoh24(hdr-\u003Edlength), via the derived unsol_data_len / imm_data_len) - out of the fixed-size descriptor:    isert_handle_iscsi_dataout():         sg_copy_from_buffer(sg_start, sg_nents, isert_get_data(rx_desc),                             unsol_data_len);   isert_handle_scsi_cmd():         sg_copy_from_buffer(cmd-\u003Ese_cmd.t_data_sg, sg_nents,                             isert_get_data(rx_desc), imm_data_len);  Because the declared length is never checked against wc-\u003Ebyte_len, an initiator can declare a data segment larger than the bytes it actually sent (and larger than the descriptor) and cause an out-of-bounds read of the receive buffer.  Nothing upstream of isert closes this door:    - __iscsit_check_dataout_hdr() bounds the inbound payload against     conn_ops-\u003EMaxXmitDataSegmentLength (MXDSL) - a transmit parameter,     used here for the inbound check.   - iscsi_set_connection_parameters() sets     ops-\u003EMaxXmitDataSegmentLength = ops-\u003ETargetRecvDataSegmentLength;     and TARGETRECVDATASEGMENTLENGTH is absent from the min()-clamp list in     iscsi_check_acceptor_state(), so the value the initiator declares is     adopted verbatim (type range 512..16777215). The initiator effectively     raises its own ceiling.   - isert never clamps the negotiated value to its own fixed receive     descriptor (ISER_RX_SIZE, 9216 bytes), so the target core\u0027s bound and     the descriptor size are unrelated.  The imm_data_len == data_len path is more than an over-read: it aliases the receive descriptor via sg_set_buf() and passes it to the backend as the data source for the SCSI WRITE, so an over-declared length causes heap contents past the descriptor to be written through the backend to the backing store. The backend is the victim of the oversized scatterlist isert hands it, not the cause; no read-back of the written bytes was demonstrated.  Trigger: after login completes (full feature phase), an initiator that has declared a large TargetRecvDataSegmentLength and a FirstBurstLength that permits unsolicited/immediate data sends a PDU whose declared data-segment length exceeds what was received. With KASAN:    BUG: KASAN: slab-out-of-bounds in sg_copy_buffer\u002B0x150/0x1c0   Read of size 4096 at addr ffff888109720800 by task kworker/1:0H/25   Workqueue: ib-comp-wq ib_cq_poll_work   Call Trace:    sg_copy_buffer\u002B0x150/0x1c0    isert_recv_done\u002B0xba6/0x2390    __ib_process_cq\u002B0xe1/0x390    ib_cq_poll_work\u002B0x46/0x150  isert_recv_done\u002B0xba6 resolves to isert_handle_iscsi_dataout() (ib_isert.c:1160), inlined through isert_rx_opcode().  Validate wc-\u003Ebyte_len against the framing in isert_recv_done() before the PDU reaches any handler, and reinstate the connection if it is short. Because the test compares without subtracting the header length, it also rejects PDUs shorter than the iSER and iSCSI headers, which would otherwise be parsed out of stale descriptor contents. The login handler rejects PDUs shorter than ISER_HEADERS_LEN (commit 29e7b925ae6d (\u0022IB/isert: Reject login PDUs shorter than ISER_HEADERS_LEN\u0022)) but does not bound the declared length either; that is fixed in the next patch. The data handlers had no length check at all.  isert reads the data segment from a fixed offset: isert_get_data() returns the iSER header plus ISER_HEADERS_LEN and makes no adjustment for an AHS.  The bytes the handlers touch are therefore exactly [ISER_HEADERS_LEN, ISER_HEADERS_LEN \u002B dlength), and comparing that sum against wc-\u003Ebyte_len bounds precisely the region that is read.  An AHS term would only make the test stricter without bounding anything furth ---truncated---",
  "published": "2026-09-17T17:17:43Z",
  "severity": "critical",
  "cvss": 9.8,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
  "epss": 0.00514,
  "epssPercentile": 0.44077,
  "priority": "Urgent",
  "priorityTier": 2,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
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