{
  "affected": [
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:13",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:14",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "7.1.6-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "In the Linux kernel, the following vulnerability has been resolved:  userfaultfd: prevent registration of special VMAs  Vova Tokarev says:    userfaultfd allows registration on shadow stack VMAs.  With userfaultfd   access, you can register on the shadow stack, discard a page ... and   inject a page with chosen return addresses via UFFDIO_COPY.  Update vma_can_userfault() to reject VM_SHADOW_STACK.  While on it, also reject VM_SPECIAL so that if a driver would implement vm_uffd_ops, it wouldn't be possible to register special VMAs with userfaultfd.  Since VM_SPECIAL includes VM_DONTEXPAND which is set but hugetlb, exclude hugetlb VMAs from the check for VM_SPECIAL.",
  "id": "DEBIAN-CVE-2026-68166",
  "modified": "2026-08-11T04:47:42.678360972Z",
  "published": "2026-08-10T13:20:03.110Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://security-tracker.debian.org/tracker/CVE-2026-68166"
    }
  ],
  "upstream": [
    "CVE-2026-68166"
  ]
}