{
  "cveId": "CVE-2026-72408",
  "url": "https://patchblox.com/security/cve/CVE-2026-72408",
  "summary": "CVE-2026-72408 is fixed in linux on 1 platform by DEBIAN-CVE-2026-72408 (version 7.1.5-1), released August 15, 2026. It is not reported as exploited. Patch Radar priority: Urgent.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  geneve: gate GRO hint in geneve_gro_complete() o...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  geneve: gate GRO hint in geneve_gro_complete() on gs-\u003Egro_hint  geneve_gro_receive() reads the GRO hint through geneve_sk_gro_hint_off(), which honours it only when the socket enabled IFLA_GENEVE_GRO_HINT (gs-\u003Egro_hint). geneve_gro_complete() instead calls the low-level geneve_opt_gro_hint_off() and acts on the hint unconditionally.  On a tunnel without the hint, receive aggregates the frames as plain ETH_P_TEB while complete still honours an attacker-supplied hint option: it inflates gh_len by gro_hint-\u003Enested_hdr_len (u8) and redirects the dispatch type, so the inner gro_complete handler runs at nhoff \u002B gh_len, an offset receive never pulled nor validated, reading out of bounds of the skb head:    BUG: KASAN: slab-out-of-bounds in ipv6_gro_complete (net/ipv6/ip6_offload.c:196)   Read of size 1 at addr ffff88800fe91980 by task exploit/153    ipv6_gro_complete (net/ipv6/ip6_offload.c:196)    geneve_gro_complete (drivers/net/geneve.c:965)    udp_gro_complete (net/ipv4/udp_offload.c:940)    inet_gro_complete (net/ipv4/af_inet.c:1621)    __gro_flush (net/core/gro.c:306)  Gate the complete path on gs-\u003Egro_hint too via geneve_sk_gro_hint_off(), so both paths agree. Tunnels that enable the hint are unaffected.",
  "published": "2026-08-15T06:22:14Z",
  "severity": "critical",
  "cvss": 10,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
  "epss": 0.00553,
  "epssPercentile": 0.46458,
  "priority": "Urgent",
  "priorityTier": 2,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.1.5-1",
      "fix": "DEBIAN-CVE-2026-72408",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-72408",
      "released": "2026-08-15T22:38:55Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T07:25:28Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}