{
  "cveId": "CVE-2026-89755",
  "url": "https://patchblox.com/security/cve/CVE-2026-89755",
  "summary": "CVE-2026-89755 is fixed in 68 products on 1 platform, first by DEBIAN-CVE-2026-89755, released September 23, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "mm/migrate_device: clear stale mapping after freeing swapcache",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  mm/migrate_device: clear stale mapping after freeing swapcache  __migrate_device_pages() reads the folio mapping before calling folio_free_swap().  When folio_free_swap() succeeds, the folio is removed from the swap cache, but the saved mapping still points to swap_space.  Passing the stale mapping to folio_migrate_mapping() makes it use the mapped-folio path for a folio that is no longer in swapcache.  It can then operate on swap_space.i_pages with invalid reference accounting, eventually triggering a folio reference count BUG.  After a successful split, nr still contains the number of pages in the original large folio, although each resulting page is now a separate order-0 folio.  Reset nr to 1 so each split folio is processed separately, including its own swapcache removal and mapping lookup.  Refresh the saved mapping after folio_free_swap() so the current folio state is used during migration.",
  "published": "2026-09-11T20:20:06Z",
  "severity": "Moderate",
  "cvss": 7.8,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.00157,
  "epssPercentile": 0.04871,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-89755",
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      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3193",
      "released": "2026-11-07T01:06:52Z"
    },
    {
      "platform": "linux",
      "product": "python3-perf6.12-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:6.12.111-136.204.amzn2023",
      "fix": "ALAS2023-2026-3193",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3193",
      "released": "2026-11-07T01:06:52Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T13:06:02Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}