{
  "cveId": "CVE-2025-39910",
  "url": "https://patchblox.com/security/cve/CVE-2025-39910",
  "summary": "CVE-2025-39910 is fixed in linux on 1 platform, first by DEBIAN-CVE-2025-39910, released October 1, 2025. It is not reported as exploited. Patch Radar priority: Urgent.",
  "title": "mm/vmalloc, mm/kasan: respect gfp mask in kasan_populate_vmalloc()",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  mm/vmalloc, mm/kasan: respect gfp mask in kasan_populate_vmalloc()  kasan_populate_vmalloc() and its helpers ignore the caller\u0027s gfp_mask and always allocate memory using the hardcoded GFP_KERNEL flag.  This makes them inconsistent with vmalloc(), which was recently extended to support GFP_NOFS and GFP_NOIO allocations.  Page table allocations performed during shadow population also ignore the external gfp_mask.  To preserve the intended semantics of GFP_NOFS and GFP_NOIO, wrap the apply_to_page_range() calls into the appropriate memalloc scope.  xfs calls vmalloc with GFP_NOFS, so this bug could lead to deadlock.  There was a report here https://lkml.kernel.org/r/686ea951.050a0220.385921.0016.GAE@google.com  This patch:  - Extends kasan_populate_vmalloc() and helpers to take gfp_mask;  - Passes gfp_mask down to alloc_pages_bulk() and __get_free_page();  - Enforces GFP_NOFS/NOIO semantics with memalloc_*_save()/restore()    around apply_to_page_range();  - Updates vmalloc.c and percpu allocator call sites accordingly.",
  "published": "2025-10-01T08:15:33Z",
  "severity": "Critical",
  "cvss": 9.8,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.00148,
  "epssPercentile": 0.04041,
  "priority": "Urgent",
  "priorityTier": 2,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-39910",
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.12.115-2",
      "fix": "DEBIAN-CVE-2025-39910",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2025-39910",
      "released": "2025-10-01T08:15:33Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "6.16.8-1",
      "fix": "DEBIAN-CVE-2025-39910",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2025-39910",
      "released": "2025-10-01T08:15:33Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T07:25:28Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}