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CVE-2026-46280

Full vulnerability record from the local CVENow database.

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 "Minor hmm_test fixes and cleanups". 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't 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.

Severity
HIGH
CVSS score
7.8 (v3.1)
Vulnerability status
Modified
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-06-08 17:16:45.683000
Last modified
2026-10-19 20:18:40.790000
View original CVE JSON 
{
  "id": "CVE-2026-46280",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-06-08T17:16:45.683",
  "lastModified": "2026-10-19T20:18:40.790",
  "vulnStatus": "Modified",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nlib: test_hmm: evict device pages on file close to avoid use-after-free\n\nPatch series \"Minor hmm_test fixes and cleanups\".\n\nTwo bugfixes a cleanup for the HMM kernel selftests.  These were mostly\nreported by Zenghui Yu with special thanks to Lorenzo for analysing and\npointing out the problems.\n\n\nThis patch (of 3):\n\nWhen dmirror_fops_release() is called it frees the dmirror struct but\ndoesn't migrate device private pages back to system memory first.  This\nleaves those pages with a dangling zone_device_data pointer to the freed\ndmirror.\n\nIf a subsequent fault occurs on those pages (eg.  during coredump) the\ndmirror_devmem_fault() callback dereferences the stale pointer causing a\nkernel panic.  This was reported [1] when running mm/ksft_hmm.sh on arm64,\nwhere a test failure triggered SIGABRT and the resulting coredump walked\nthe VMAs faulting in the stale device private pages.\n\nFix this by calling dmirror_device_evict_chunk() for each devmem chunk in\ndmirror_fops_release() to migrate all device private pages back to system\nmemory before freeing the dmirror struct.  The function is moved earlier\nin the file to avoid a forward declaration."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nlib: test_hmm: expulsar páginas de dispositivo al cerrar el archivo para evitar el uso después de liberación\n\nSerie de parches 'Correcciones y limpiezas menores de hmm_test'.\n\nDos correcciones de errores y una limpieza para las autopruebas del kernel HMM. Estos fueron reportados principalmente por Zenghui Yu con un agradecimiento especial a Lorenzo por analizar y señalar los problemas.\n\nEste parche (de 3):\n\nCuando se llama a dmirror_fops_release(), libera la estructura dmirror pero no migra primero las páginas privadas del dispositivo de vuelta a la memoria del sistema. Esto deja esas páginas con un puntero zone_device_data colgante a la dmirror liberada.\n\nSi ocurre una falla posterior en esas páginas (por ejemplo, durante un coredump), la devolución de llamada dmirror_devmem_fault() desreferencia el puntero obsoleto causando un pánico del kernel. Esto fue reportado [1] al ejecutar mm/ksft_hmm.sh en arm64, donde una falla de prueba activó SIGABRT y el coredump resultante recorrió las VMA causando fallas en las páginas privadas de dispositivo obsoletas.\n\nSolucione esto llamando a dmirror_device_evict_chunk() para cada fragmento de devmem en dmirror_fops_release() para migrar todas las páginas privadas del dispositivo de vuelta a la memoria del sistema antes de liberar la estructura dmirror. La función se mueve antes en el archivo para evitar una declaración anticipada."
    }
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              "versionType": "original_commit_for_fix",
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          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "attackVector": "LOCAL",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
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          "availabilityImpact": "HIGH"
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        "ssvcData": {
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          "role": "CISA Coordinator",
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  "weaknesses": [
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      "source": "[email protected]",
      "type": "Primary",
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