{
  "affected": [
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:14",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "7.1.9-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "In the Linux kernel, the following vulnerability has been resolved:  vhost-scsi: reject feature changes after endpoint  vhost_scsi_setup_vq_cmds() runs from VHOST_SCSI_SET_ENDPOINT and allocates each command's protection scatterlist array (prot_sgl) according to the acknowledged VIRTIO_SCSI_F_T10_PI bit.  The command pools are not rebuilt when VHOST_SET_FEATURES changes that bit later.  Although virtio feature bits must not change after feature negotiation, vhost_scsi_set_features() currently accepts such a request after the endpoint is active and updates acked_features.  Enabling T10-PI after endpoint setup therefore leaves prot_sgl NULL while the I/O path follows the new feature bit.  For a 129-page protection payload, vhost_scsi_mapal() passes the missing first chunk to sg_alloc_table_chained():    sg_alloc_table_chained(table, 129, first_chunk=NULL,                          nents_first_chunk=inline_sg_cnt)  sg_pool_index() then hits:    BUG_ON(nents \u003e SG_CHUNK_SIZE);   /* 129 \u003e 128 */  The kernel reported the following call trace and register state:    Call Trace:    \u003cTASK\u003e    ? __sg_alloc_table+0x1d8/0x250    ? __pfx_vhost_run_work_list+0x10/0x10 [vhost]    sg_alloc_table_chained+0x59/0xf0    ? __pfx_sg_pool_alloc+0x10/0x10    ? vhost_scsi_calc_sgls.constprop.0+0x43/0x60 [vhost_scsi]    vhost_scsi_handle_vq+0xf02/0x1700 [vhost_scsi]    ? __pfx_vhost_scsi_handle_vq+0x10/0x10 [vhost_scsi]    vhost_scsi_handle_kick+0x37/0x50 [vhost_scsi]    vhost_run_work_list+0x8e/0xd0 [vhost]    vhost_task_fn+0xe1/0x210    ret_from_fork+0x348/0x540    \u003c/TASK\u003e    RIP: 0010:0x4   CR2 = 0x4   RSP: 0018:ffffc90000dbf940 EFLAGS: 00010202   RAX: ffffffff82396810 RBX: ffff88811dc28b80 RCX: 0000000000000000   RDX: 0000000000000000 RSI: 0000000000000820 RDI: 0000000000000081  VHOST_F_LOG_ALL is a vhost-specific runtime feature and remains the only exception.  Reject changes to any feature other than VHOST_F_LOG_ALL while the endpoint is active.  This preserves the existing runtime log toggle while preventing feature-dependent command resources and data-path state from becoming inconsistent.  Userspace must clear the endpoint before changing any other negotiated feature and set the endpoint up again afterward.",
  "id": "DEBIAN-CVE-2026-74702",
  "modified": "2026-09-14T16:47:40.419708522Z",
  "published": "2026-08-22T16:16:44.873Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://security-tracker.debian.org/tracker/CVE-2026-74702"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "upstream": [
    "CVE-2026-74702"
  ]
}