{
  "affected": [
    {
      "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:  fuse: copy request headers via a stack buffer for io-uring  The fuse-io-uring transport copies req-\u003ein.h out to the ring in fuse_uring_copy_to_ring() and req-\u003eout.h back in fuse_uring_commit(). Both headers live inside the fuse_request slab object, whose cache (fuse_req_cachep) is created without a usercopy whitelist, so copying them directly to/from userspace trips CONFIG_HARDENED_USERCOPY and panics:    usercopy: Kernel memory exposure attempt detected from SLUB object   'fuse_request' (offset 56, size 40)!   kernel BUG at mm/usercopy.c:102!   Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI   RIP: 0010:usercopy_abort (mm/usercopy.c:90)   Call Trace:    __check_heap_object (mm/slub.c:8268)    __check_object_size (mm/usercopy.c:197 mm/usercopy.c:258 mm/usercopy.c:223)    copy_header_to_ring (fs/fuse/dev_uring.c:618)    fuse_uring_prepare_send (fs/fuse/dev_uring.c:776 fs/fuse/dev_uring.c:785)    fuse_uring_send_in_task (fs/fuse/dev_uring.c:1306)    tctx_task_work_run (io_uring/tw.c:96)    task_work_run (kernel/task_work.c:233)    io_run_task_work (io_uring/tw.h:84)    io_cqring_wait (io_uring/wait.c:278)    __do_sys_io_uring_enter (io_uring/io_uring.c:2685)    entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)  Bounce both headers through an on-stack copy so the usercopy touches stack memory, not the slab object.",
  "id": "DEBIAN-CVE-2026-80946",
  "modified": "2026-09-12T08:47:23.601292645Z",
  "published": "2026-09-11T20:19:00.180Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://security-tracker.debian.org/tracker/CVE-2026-80946"
    }
  ],
  "upstream": [
    "CVE-2026-80946"
  ]
}