{
  "affected": [
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:13",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:14",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "In the Linux kernel, the following vulnerability has been resolved:  usb: gadget: midi2: Fix null-pointer dereference in f_midi2_free_ep_reqs  A null-pointer dereference occurs in f_midi2_free_ep_reqs() when attempting to clean up an endpoint that was never initialized.  When configuring the MIDI 2.0 gadget via configfs and setting the block direction to SNDRV_UMP_DIR_INPUT, the initialization of the midi1_ep_out endpoint is explicitly skipped during the gadget bind phase (f_midi2_bind()). As a result, the usb_ep-\u003ecard field remains NULL.  Later, when the host sets the alternate setting, f_midi2_set_alt() unconditionally stops both the IN and OUT endpoints by calling f_midi2_stop_eps(), which in turn calls f_midi2_free_ep_reqs() for both endpoints. When f_midi2_free_ep_reqs() is called for the uninitialized midi1_ep_out, it attempts to dereference usb_ep-\u003ecard to determine the number of requests to free, leading to a crash.  Fix this by using usb_ep-\u003enum_reqs instead of usb_ep-\u003ecard-\u003einfo.num_reqs in f_midi2_free_ep_reqs(). usb_ep-\u003enum_reqs is correctly set during f_midi2_init_ep() and remains 0 if the endpoint was never initialized, safely avoiding the loop. For consistency, apply the same change to f_midi2_alloc_ep_reqs().  Oops: general protection fault, probably for non-canonical address 0xdffffc00000000ee: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000770-0x0000000000000777] ... RIP: 0010:f_midi2_free_ep_reqs drivers/usb/gadget/function/f_midi2.c:1166 [inline] RIP: 0010:f_midi2_stop_eps+0x28e/0x4d0 drivers/usb/gadget/function/f_midi2.c:1246 ... Call Trace:  \u003cTASK\u003e  f_midi2_set_alt+0x11c/0xf00 drivers/usb/gadget/function/f_midi2.c:1296  composite_setup+0x1ffd/0x3480 drivers/usb/gadget/composite.c:1933  configfs_composite_setup+0xbd/0x100 drivers/usb/gadget/configfs.c:1877",
  "id": "DEBIAN-CVE-2026-90024",
  "modified": "2026-09-17T04:47:35.467707086Z",
  "published": "2026-09-16T11:17:15.357Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://security-tracker.debian.org/tracker/CVE-2026-90024"
    }
  ],
  "upstream": [
    "CVE-2026-90024"
  ]
}