{
  "cveId": "CVE-2026-89978",
  "url": "https://patchblox.com/security/cve/CVE-2026-89978",
  "summary": "CVE-2026-89978 is fixed in linux on 1 platform by DEBIAN-CVE-2026-89978 (version 7.2.6-1), released September 23, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "accel/amdxdna: return early from a zero-length flush",
  "description": "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\u002B0x3c/0x70   Call Trace:    amdxdna_drm_sync_bo_ioctl\u002B0x124/0x430 [amdxdna]    drm_ioctl\u002B0x301/0x4c0    __x64_sys_ioctl\u002B0x115/0x2f0    do_syscall_64\u002B0xa6/0x3d0  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.",
  "published": "2026-09-16T11:17:08Z",
  "severity": "",
  "epss": 0.00206,
  "epssPercentile": 0.1079,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-89978",
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.2.6-1",
      "fix": "DEBIAN-CVE-2026-89978",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-89978",
      "released": "2026-09-23T19:19:02Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T06:59:42Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}