{
  "site": "https://pwn.watch",
  "generatedAt": "2026-10-22T17:37:12.278Z",
  "tag": {
    "id": "kvm",
    "label": "KVM",
    "isStack": false,
    "url": "https://pwn.watch/t/kvm",
    "feed": "https://pwn.watch/t/kvm/feed.xml"
  },
  "counts": {
    "incidents": 1,
    "live": 1,
    "notFullyPatched": 0,
    "patched": 1
  },
  "incidents": [
    {
      "slug": "pwnescape-cve-2026-99999",
      "title": "PwnEscape: Linux networking guest-to-host escape (CVE-2026-99999)",
      "url": "https://pwn.watch/i/pwnescape-cve-2026-99999",
      "json": "https://pwn.watch/i/pwnescape-cve-2026-99999.json",
      "status": "live",
      "severity": "critical",
      "patchStatus": "patched",
      "product": "Linux kernel networking (host side of KVM/Firecracker and similar)",
      "tags": [
        "linux",
        "vercel",
        "kvm",
        "firecracker"
      ],
      "cveIds": [
        "CVE-2026-99999"
      ],
      "affectedVersions": [
        "Kernels before stable backports such as 5.10.272, 5.15.223, 6.1.190, 6.6.159, 6.12.113, 6.18.57, 7.2.11 (verify vendor packages)"
      ],
      "fixedVersions": [
        "Upstream commit 6785011f8b16 and matching stable backports; vendor kernels as listed by distros"
      ],
      "startedAt": "2026-10-08",
      "closedAt": null,
      "updatedAt": "2026-10-22T11:18:00+02:00",
      "summary": "Paulos Yibelo / pwn.ai found a Critical Linux networking flaw (CVE-2026-99999, CVSS 9.3) during Vercel’s $1M Sandbox challenge. Guest-controlled checksum metadata can rewrite an IPv4 header after validation, enabling host-memory disclosure and, in lab conditions, guest-to-host code execution on KVM/Firecracker. Upstream fix merged Oct 2026; host kernels need patch + reboot. Affects multi-tenant VPS / sandbox providers more than end-user desktops.",
      "xPost": null
    }
  ],
  "posts": [
    {
      "authorName": "Smukx.E",
      "handle": "5mukx",
      "avatarUrl": "https://pbs.twimg.com/profile_images/2091240145597149184/VgritadL_bigger.jpg",
      "text": "PwnEscape-Ai Research: Guest-to-Host KVM Escape (CVE-2026-99999). \n\nTLDR;- How a $1 million sandbox challenge led us to a vulnerability in Linux networking, repeatable host-memory disclosure, and ultimately a full guest-to-host escape.\n\nBlog:- https://t.co/CJERkG4rsE https://t.co/gdXbOvkklw",
      "date": "2026-10-20T17:15:55.000Z",
      "url": "https://x.com/5mukx/status/2112593667601125676",
      "media": [
        {
          "type": "image",
          "url": "https://pbs.twimg.com/media/HVFwRXXaMAAvIvQ.jpg"
        }
      ],
      "incident": "pwnescape-cve-2026-99999"
    },
    {
      "authorName": "blackorbird",
      "handle": "blackorbird",
      "avatarUrl": "https://pbs.twimg.com/profile_images/1390264140908748806/I8nxLuzB_bigger.jpg",
      "text": "How can one obtain such a great identifier as CVE-2026-99999? #PwnEscape",
      "date": "2026-10-19T08:17:27.000Z",
      "url": "https://x.com/blackorbird/status/2112095772124864777",
      "media": [],
      "incident": "pwnescape-cve-2026-99999"
    },
    {
      "authorName": "The Daily Tech Feed",
      "handle": "dailytechonx",
      "avatarUrl": "https://pbs.twimg.com/profile_images/1889684200258764800/AEZLG4yL_bigger.jpg",
      "text": "Just uncovered: the “PwnEscape” Linux kernel flaw (CVE-2026-99999) lets guest VMs read host memory. A 9.3/10 critical issue, exposed via crafted packets in Vercel’s sandbox and patched in recent kernel versions. If you run shared Linux hosts, updating is mandatory. https://t.co/mqBjjVqe1d",
      "date": "2026-10-15T20:41:18.000Z",
      "url": "https://x.com/dailytechonx/status/2110833417642291284",
      "media": [
        {
          "type": "image",
          "url": "https://pbs.twimg.com/media/HUsvzsdWsAAq8Wp.jpg"
        }
      ],
      "incident": "pwnescape-cve-2026-99999"
    }
  ],
  "changes": [
    {
      "incident": "pwnescape-cve-2026-99999",
      "incidentTitle": "PwnEscape: Linux networking guest-to-host escape (CVE-2026-99999)",
      "severity": "critical",
      "status": "live",
      "patchStatus": "patched",
      "date": "2026-10-14/15",
      "title": "Mainline merge / public write-ups.",
      "body": null,
      "sourceUrl": null,
      "url": "https://pwn.watch/i/pwnescape-cve-2026-99999"
    },
    {
      "incident": "pwnescape-cve-2026-99999",
      "incidentTitle": "PwnEscape: Linux networking guest-to-host escape (CVE-2026-99999)",
      "severity": "critical",
      "status": "live",
      "patchStatus": "patched",
      "date": "2026-10-07/08",
      "title": "Upstream IPv4 checksum guard accepted into net.git.",
      "body": null,
      "sourceUrl": null,
      "url": "https://pwn.watch/i/pwnescape-cve-2026-99999"
    },
    {
      "incident": "pwnescape-cve-2026-99999",
      "incidentTitle": "PwnEscape: Linux networking guest-to-host escape (CVE-2026-99999)",
      "severity": "critical",
      "status": "live",
      "patchStatus": "patched",
      "date": "2026-08-20",
      "title": "Initial host-memory disclosure reported.",
      "body": null,
      "sourceUrl": null,
      "url": "https://pwn.watch/i/pwnescape-cve-2026-99999"
    },
    {
      "incident": "pwnescape-cve-2026-99999",
      "incidentTitle": "PwnEscape: Linux networking guest-to-host escape (CVE-2026-99999)",
      "severity": "critical",
      "status": "live",
      "patchStatus": "patched",
      "date": "2026-08-18",
      "title": "Vercel Sandbox challenge opens.",
      "body": null,
      "sourceUrl": null,
      "url": "https://pwn.watch/i/pwnescape-cve-2026-99999"
    }
  ]
}