{
  "cveId": "CVE-2026-98106",
  "url": "https://patchblox.com/security/cve/CVE-2026-98106",
  "summary": "CVE-2026-98106 is fixed in linux on 1 platform by DEBIAN-CVE-2026-98106 (version 7.2.7-1), released October 2, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "drm/pagemap: Prevent double migration of device pages",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  drm/pagemap: Prevent double migration of device pages  A device-private folio migrated to system memory by a CPU fault can remain reachable through the raw-PFN eviction path until migration finalization drops the source reference.  If eviction selects the same device-private folio during this window, it can attempt to migrate the folio again. The second migration can leave an uncharged folio on an LRU list, causing folio_lruvec_lock_irqsave() to retry indefinitely and resulting in a soft lockup and RCU stall.  Mark successfully migrated device-private folios using a low bit of their zone_device_data before migration finalization. Make both CPU-fault and raw-PFN migration paths skip device-private folios carrying this flag.  Mask the flag when retrieving the drm_pagemap_zdd pointer and preserve it when a device-private folio is split. Keeping the state on the physical folio also avoids depending on a virtual address that may change before a fault occurs.  v2: - Replace the retired-PFN XArray with an embedded bitmap. (Matthew Brost) - Mark every base page covered by a migrated folio so retirement remains   valid if the folio is later split.  v3: - Store the migrated state in a low bit of zone_device_data instead of   adding virtual-range and bitmap tracking to the ZDD. (Matthew Brost) - Mask the flag when retrieving the ZDD and preserve it when splitting   a folio. - Drop the pre-existing fixes already covered by Matthew Brost\u0027s series:   https://patchwork.freedesktop.org/series/171651/  v4: - Advance by the folio size only for migration entries marked with   MIGRATE_PFN_COMPOUND. (Sashiko)  v5: - Simplify ZDD flag updates and folio iteration. (Matthew Brost) - Skip retired device-private folios in the CPU-fault path. (Matthew Brost) - Preserve flag bits while taking a new ZDD reference for split folios.  v6: - Restore MIGRATE_PFN_COMPOUND-aware stepping so non-compound migration   entries are processed one at a time. (Sashiko) - Drop the pre-existing fixes already covered by Matthew Brost\u0027s series:   https://patchwork.freedesktop.org/series/171651/  The lockup was observed as: [10109.860465] watchdog: BUG: soft lockup - CPU#9 stuck for 26s! [kworker/u65:5:6557] [10109.860524] Tainted: [S]=CPU_OUT_OF_SPEC, [O]=OOT_MODULE [10109.860524] Hardware name: ASUS System Product Name/PRIME Z790-P WIFI, BIOS 0812 02/24/2023 [10109.860525] Workqueue: xe_page_fault_work_queue xe_pagefault_queue_work [xe] [10109.860644] RIP: 0010:_raw_spin_unlock_irqrestore\u002B0x57/0x80 [10109.860655] Call Trace: [10109.860655]  \u003CTASK\u003E [10109.860657]  folio_lruvec_lock_irqsave\u002B0x216/0x220 [10109.860661]  ? __pfx_lru_add\u002B0x10/0x10 [10109.860665]  folio_batch_move_lru\u002B0xc8/0x450 [10109.860670]  ? lock_acquire\u002B0xc4/0x2d0 [10109.860674]  ? __folio_batch_add_and_move\u002B0x60/0x2e0 [10109.860677]  ? folio_migrate_mapping\u002B0xa6/0x110 [10109.860679]  ? folio_migrate_flags\u002B0x13b/0x1b0 [10109.860681]  ? __pfx_lru_add\u002B0x10/0x10 [10109.860683]  __folio_batch_add_and_move\u002B0xe7/0x2e0 [10109.860685]  ? dma_iova_try_alloc\u002B0xb0/0x140 [10109.860689]  folio_add_lru\u002B0x64/0x80 [10109.860691]  __migrate_device_finalize\u002B0x12c/0x270 [10109.860695]  migrate_device_finalize\u002B0x10/0x20 [10109.860698]  drm_pagemap_evict_to_ram\u002B0x185/0x370 [drm_gpusvm_helper] [10109.860704]  ? drm_pagemap_evict_to_ram\u002B0x96/0x370 [drm_gpusvm_helper] [10109.860709]  xe_svm_bo_evict\u002B0x15/0x20 [xe] [10109.860819]  ? xe_svm_bo_evict\u002B0x15/0x20 [xe] [10109.860921]  xe_bo_move\u002B0x107e/0x1570 [xe] [10109.860992]  ? xe_ttm_tt_create\u002B0x168/0x340 [xe] [10109.861059]  ? __up_read\u002B0x98/0x2b0 [10109.861061]  ? lock_is_held_type\u002B0xa3/0x130 [10109.861067]  ttm_bo_handle_move_mem\u002B0xe8/0x1e0 [ttm] [10109.861075]  ttm_bo_evict\u002B0x141/0x1c0 [ttm] [10109.861081]  ttm_bo_evict_cb\u002B0x9f/0x100 [ttm] [10109.861086]  ttm_lru_walk_for_evict\u002B0x84/0x190 [ttm] [10109.861091]  ? xe_ttm_vram_mgr_new\u002B0x258/0x3a0 [xe] [10109.861198]  ttm_bo_alloc_resource\u002B0x219/0 ---truncated---",
  "published": "2026-09-25T11:17:41Z",
  "severity": "",
  "epss": 0.00155,
  "epssPercentile": 0.04693,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-98106",
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.2.7-1",
      "fix": "DEBIAN-CVE-2026-98106",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-98106",
      "released": "2026-10-02T21:04:56Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T01:18:40Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}