{
  "affected": [
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:14",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "7.1.5-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "In the Linux kernel, the following vulnerability has been resolved:  cxl/region: Fill first free targets[] slot during auto-discovery  Any invalid endpoint decoder pointer in the target array of an active region is not allowed by cxl driver. This means cxl driver always assumes the first p-\u003enr_targets entries of the target array in an auto-assembly region are valid. However, there are scenarios that could leave NULL endpoint decoder pointer holes in the target array.  1. When cxl_cancel_auto_attach() removes an endpoint decoder from a    target array, the target slot is set to NULL. If the removed endpoint    decoder is not the last element in the target array, the target array    will contain a NULL hole.  2. When a auto-assembly region removes an assigned endpoint decoder, if    the removed endpoint decoder is not the last element in the target    array, always remains a NULL hole in the target array.  When a NULL pointer hole exists in a region's target array, it introduces two potential problems: 1. Access an endpoint decoder via a NULL pointer. it always trigger    calltrace like that.     Oops: general protection fault, probably for non-canonical address 0xdffffc0000000008: 0000 [#1] SMP KASAN PTI     RIP: 0010:cxl_calc_interleave_pos+0x26/0x810 [cxl_core]     Call Trace:       \u003cTASK\u003e       cxl_region_attach+0xc50/0x2140 [cxl_core]       cxl_add_to_region+0x321/0x2330 [cxl_core]       discover_region+0x92/0x150 [cxl_port]       device_for_each_child+0xf3/0x170       cxl_port_probe+0x150/0x200 [cxl_port]       cxl_bus_probe+0x4f/0xa0 [cxl_core]       really_probe+0x1c8/0x960       __driver_probe_device+0x323/0x450       driver_probe_device+0x45/0x120       __device_attach_driver+0x15d/0x280       bus_for_each_drv+0x10f/0x190  2. Not having enough valid endpoint decoders attached to an    auto-assembly region. if an auto-assembly region is created with lock    flag or assigned endpoint decoder with lock flag, which means    assigned endpoint decoder will not be reset during detaching, they    could re-attach to the auto-assembly region again. But cxl region    driver relies on p-\u003enr_targets to verify whether the required number    of endpoint decoders has been attached, and NULL endpoint decoder    pointers are still counted in that case.  To fix above issues, adjust cxl_region_attach_auto() logic to find the first free target slot for endpoint decoder attachment, this ensures NULL holes in the target array are filled, rather than adding new endpoint decoders at the tail of the target array.",
  "id": "DEBIAN-CVE-2026-74274",
  "modified": "2026-09-14T16:47:33.619771832Z",
  "published": "2026-08-15T06:22:26.793Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://security-tracker.debian.org/tracker/CVE-2026-74274"
    }
  ],
  "upstream": [
    "CVE-2026-74274"
  ]
}