{
  "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:  accel/amdxdna: return early from a zero-length flush  SYNC_BO does not constrain its size, so a request for zero bytes reaches drm_clflush_virt_range(), which ends with an unconditional clflushopt(end - 1). For an empty range that is the byte before the mapping, and abo-\u003emem.kva comes from vmap(), so the access lands in the guard page below the vmalloc area and faults:    BUG: unable to handle page fault for address: ffffd16fbbc70fff   #PF: supervisor read access in kernel mode   Oops: Oops: 0000 [#1] SMP NOPTI   CPU: 7 UID: 1000 Comm: sync_bo_probe   RIP: 0010:drm_clflush_virt_range+0x3c/0x70   Call Trace:    amdxdna_drm_sync_bo_ioctl+0x124/0x430 [amdxdna]    drm_ioctl+0x301/0x4c0    __x64_sys_ioctl+0x115/0x2f0    do_syscall_64+0xa6/0x3d0  Any process that can open the render node can do this. Reproduced 3 of 3 times on a Strix Point NPU (1022:17f0), by calling SYNC_BO with size 0 on an AMDXDNA_BO_SHARE object. The import arm takes the same request but flushes the whole scatterlist, so it survives it.  Nothing needs flushing for an empty range, so answer before choosing a path.",
  "id": "DEBIAN-CVE-2026-89978",
  "modified": "2026-09-17T04:47:39.315260817Z",
  "published": "2026-09-16T11:17:08.667Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://security-tracker.debian.org/tracker/CVE-2026-89978"
    }
  ],
  "upstream": [
    "CVE-2026-89978"
  ]
}