CVE-2026-74716 (GCVE-0-2026-74716)

Vulnerability from cvelistv5 – Published: 2026-08-22 15:33 – Updated: 2026-10-15 10:09
VLAI
Title
accel/amdxdna: Fix locally exploitable BUG_ON in amdxdna_insert_pages()
Summary
In the Linux kernel, the following vulnerability has been resolved: accel/amdxdna: Fix locally exploitable BUG_ON in amdxdna_insert_pages() In amdxdna_insert_pages(), vm_flags_mod() sets VM_MIXEDMAP and clears VM_PFNMAP. If an unprivileged userspace process mmaps a non-imported GEM object and then calls madvise(MADV_DONTNEED), the PTEs will be successfully cleared because VM_MIXEDMAP allows this (unlike VM_PFNMAP). When userspace subsequently accesses the memory, drm_gem_shmem_fault() handles the page fault and attempts to map the backing shmem page via vmf_insert_pfn() which calls vmf_insert_pfn_prot(). Because the backing shmem page is normal system memory (pfn_valid(pfn) is true) and the VMA now has VM_MIXEDMAP set, won't this predictably trigger the explicit assertion BUG_ON((vma->vm_flags & VM_MIXEDMAP) && pfn_valid(pfn)) Fix by removing the vm_flags_mod() call and replacing the vm_insert_pages() pre-population with the handle_mm_fault() loop that was already used for the import (dma-buf) path.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6664 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: e486147c912f653ef4b60a6c7dbd4168a4c56a9f , < 618fc8dc219c11b8b85f0c8e3f7ff46cc1544339 (git)
Affected: e486147c912f653ef4b60a6c7dbd4168a4c56a9f , < 13339132d89d00b513dff0730bff3a313b9b13b5 (git)
Affected: e486147c912f653ef4b60a6c7dbd4168a4c56a9f , < 4a19f7ab5972ef608b31ae921419bc3e04b3f8ad (git)
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Linux Linux Affected: 6.16
Unaffected: 0 , < 6.16 (semver)
Unaffected: 6.18.57 , ≤ 6.18.* (semver)
Unaffected: 7.1.9 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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{
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          "product": "Linux",
          "programFiles": [
            "drivers/accel/amdxdna/amdxdna_gem.c"
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\naccel/amdxdna: Fix locally exploitable BUG_ON in amdxdna_insert_pages()\n\nIn amdxdna_insert_pages(), vm_flags_mod() sets VM_MIXEDMAP and clears\nVM_PFNMAP. If an unprivileged userspace process mmaps a non-imported GEM\nobject and then calls madvise(MADV_DONTNEED), the PTEs will be\nsuccessfully cleared because VM_MIXEDMAP allows this (unlike VM_PFNMAP).\n\nWhen userspace subsequently accesses the memory, drm_gem_shmem_fault()\nhandles the page fault and attempts to map the backing shmem page via\nvmf_insert_pfn() which calls vmf_insert_pfn_prot(). Because the backing\nshmem page is normal system memory (pfn_valid(pfn) is true) and the VMA\nnow has VM_MIXEDMAP set, won\u0027t this predictably trigger the explicit\nassertion BUG_ON((vma-\u003evm_flags \u0026 VM_MIXEDMAP) \u0026\u0026 pfn_valid(pfn))\n\nFix by removing the vm_flags_mod() call and replacing the vm_insert_pages()\npre-population with the handle_mm_fault() loop that was already used for\nthe import (dma-buf) path."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-15T10:09:23.729Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/618fc8dc219c11b8b85f0c8e3f7ff46cc1544339"
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          "url": "https://git.kernel.org/stable/c/13339132d89d00b513dff0730bff3a313b9b13b5"
        },
        {
          "url": "https://git.kernel.org/stable/c/4a19f7ab5972ef608b31ae921419bc3e04b3f8ad"
        }
      ],
      "title": "accel/amdxdna: Fix locally exploitable BUG_ON in amdxdna_insert_pages()",
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    "cveId": "CVE-2026-74716",
    "datePublished": "2026-08-22T15:33:10.876Z",
    "dateReserved": "2026-08-15T05:44:03.928Z",
    "dateUpdated": "2026-10-15T10:09:23.729Z",
    "state": "PUBLISHED"
  },
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        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\naccel/amdxdna: Fix locally exploitable BUG_ON in amdxdna_insert_pages()\n\nIn amdxdna_insert_pages(), vm_flags_mod() sets VM_MIXEDMAP and clears\nVM_PFNMAP. If an unprivileged userspace process mmaps a non-imported GEM\nobject and then calls madvise(MADV_DONTNEED), the PTEs will be\nsuccessfully cleared because VM_MIXEDMAP allows this (unlike VM_PFNMAP).\n\nWhen userspace subsequently accesses the memory, drm_gem_shmem_fault()\nhandles the page fault and attempts to map the backing shmem page via\nvmf_insert_pfn() which calls vmf_insert_pfn_prot(). Because the backing\nshmem page is normal system memory (pfn_valid(pfn) is true) and the VMA\nnow has VM_MIXEDMAP set, won\u0027t this predictably trigger the explicit\nassertion BUG_ON((vma-\u003evm_flags \u0026 VM_MIXEDMAP) \u0026\u0026 pfn_valid(pfn))\n\nFix by removing the vm_flags_mod() call and replacing the vm_insert_pages()\npre-population with the handle_mm_fault() loop that was already used for\nthe import (dma-buf) path."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\naccel/amdxdna: Correcci\u00f3n de un BUG_ON explotable localmente en amdxdna_insert_pages()\n\nEn amdxdna_insert_pages(), vm_flags_mod() establece VM_MIXEDMAP y borra VM_PFNMAP. Si un proceso de espacio de usuario no privilegiado mapea un objeto GEM no importado y luego llama a madvise(MADV_DONTNEED), los PTEs ser\u00e1n borrados exitosamente porque VM_MIXEDMAP lo permite (a diferencia de VM_PFNMAP).\n\nCuando el espacio de usuario accede posteriormente a la memoria, drm_gem_shmem_fault() maneja el fallo de p\u00e1gina e intenta mapear la p\u00e1gina shmem de respaldo a trav\u00e9s de vmf_insert_pfn() que llama a vmf_insert_pfn_prot(). Debido a que la p\u00e1gina shmem de respaldo es memoria normal del sistema (pfn_valid(pfn) es verdadero) y el VMA ahora tiene VM_MIXEDMAP establecido, \u00bfno activar\u00e1 esto predeciblemente la aserci\u00f3n expl\u00edcita BUG_ON((vma -\u003e vm_flags \u0026 VM_MIXEDMAP) \u0026\u0026 pfn_valid(pfn))?\n\nCorrecci\u00f3n eliminando la llamada a vm_flags_mod() y reemplazando la pre-poblaci\u00f3n de vm_insert_pages() con el bucle handle_mm_fault() que ya se utilizaba para la ruta de importaci\u00f3n (dma-buf)."
          }
        ],
        "id": "CVE-2026-74716",
        "lastModified": "2026-10-15T11:17:48.727",
        "metrics": {},
        "published": "2026-08-22T16:16:46.443",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
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      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-24T18:37:28+00:00",
      "cve": "CVE-2026-74716",
      "id": "CVE-2026-74716",
      "initial_release_date": "2026-08-22T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: accel/amdxdna: Fix locally exploitable BUG_ON in amdxdna_insert_pages()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74716.json",
      "version": "3"
    }
  }
}



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