{
  "affected": [
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:12",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.1.187-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "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"
            },
            {
              "fixed": "7.1.13-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "In the Linux kernel, the following vulnerability has been resolved:  usb: usbfs: fix use-after-free of usb_device in usbdev_release()  usbdev_release() drops its reference to the struct usb_device before draining the list of completed async URBs, but that drain path reads back through the same object: free_async() calls dec_usb_memory_use_count() for any URB whose buffer came from the usbfs mmap() region, and its first statement is bus_to_hcd(ps-\u003edev-\u003ebus).  After a disconnect the usbfs reference can be the last one, in which case usb_put_dev() frees the device and the subsequent loop reads offset 80 of freed memory and uses the result as a struct usb_hcd *, which hcd_buffer_free_pages() then dereferences.  This is reachable by an unprivileged process that has read/write access to a /dev/bus/usb node: mmap() the fd, submit one URB with a buffer inside the mapping, wait for the device to be unplugged, then munmap() and close(). It reproduces on every attempt rather than being a race, because a live MAP_SHARED vma holds a reference on the struct file, so usbdev_release() cannot run until the last vma is gone and the freeing branch of dec_usb_memory_use_count() is always taken.    BUG: KASAN: slab-use-after-free in dec_usb_memory_use_count+0x3ae/0x410   Read of size 8 at addr ffff8880122ee050 by task poc/769   CPU: 1 UID: 1000 PID: 769 Comm: poc Tainted: G    B    6.12.94 #3    Call Trace:    dec_usb_memory_use_count+0x3ae/0x410    free_async+0x2aa/0x4f0    usbdev_release+0x375/0x460    __fput+0x3ea/0xb50    __x64_sys_close+0x86/0x100    Allocated by task 11:    usb_alloc_dev+0x55/0xd90    hub_event+0x2524/0x43d0    Freed by task 769:    kfree+0x121/0x360    device_release+0xd2/0x280    usb_put_dev+0x23/0x30    usbdev_release+0x2d8/0x460  Release the device reference after the drain loop instead. Nothing between the two points requires it to have been dropped.",
  "id": "DEBIAN-CVE-2026-80824",
  "modified": "2026-09-14T16:47:35.714509687Z",
  "published": "2026-09-04T16:18:10.233Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://security-tracker.debian.org/tracker/CVE-2026-80824"
    }
  ],
  "upstream": [
    "CVE-2026-80824"
  ]
}