{
  "cveId": "CVE-2026-46280",
  "url": "https://patchblox.com/security/cve/CVE-2026-46280",
  "summary": "CVE-2026-46280 is fixed in linux on 1 platform, first by DEBIAN-CVE-2026-46280, released June 24, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "lib: test_hmm: evict device pages on file close to avoid use-after-free",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  lib: test_hmm: evict device pages on file close to avoid use-after-free  Patch series \u0022Minor hmm_test fixes and cleanups\u0022.  Two bugfixes a cleanup for the HMM kernel selftests.  These were mostly reported by Zenghui Yu with special thanks to Lorenzo for analysing and pointing out the problems.   This patch (of 3):  When dmirror_fops_release() is called it frees the dmirror struct but doesn\u0027t migrate device private pages back to system memory first.  This leaves those pages with a dangling zone_device_data pointer to the freed dmirror.  If a subsequent fault occurs on those pages (eg.  during coredump) the dmirror_devmem_fault() callback dereferences the stale pointer causing a kernel panic.  This was reported [1] when running mm/ksft_hmm.sh on arm64, where a test failure triggered SIGABRT and the resulting coredump walked the VMAs faulting in the stale device private pages.  Fix this by calling dmirror_device_evict_chunk() for each devmem chunk in dmirror_fops_release() to migrate all device private pages back to system memory before freeing the dmirror struct.  The function is moved earlier in the file to avoid a forward declaration.",
  "published": "2026-06-08T17:16:45Z",
  "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": 0.00126,
  "epssPercentile": 0.02314,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-46280",
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "6.1.176-1",
      "fix": "DEBIAN-CVE-2026-46280",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-46280",
      "released": "2026-06-24T14:07:24Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.12.86-1",
      "fix": "DEBIAN-CVE-2026-46280",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-46280",
      "released": "2026-06-24T14:07:24Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.0.4-1",
      "fix": "DEBIAN-CVE-2026-46280",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-46280",
      "released": "2026-06-24T14:07:24Z"
    }
  ],
  "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"
  }
}