{
  "affected": [
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:14",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "7.2.8-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "In the Linux kernel, the following vulnerability has been resolved:  net: ip_tunnel: initialize `options_len` before referencing options  The following command triggers a kernel panic:    ip link add d0 type dummy; ip link set d0 up   ip route add 10.30.0.0/16 \\     encap ip id 300 geneve_opts 4660:66:11223344 dev d0    memcpy: detected buffer overflow: 4 byte write of buffer size 0   kernel BUG at lib/string_helpers.c:1044!   ...   ip_tun_parse_opts.part.0.cold+0x10/0x10   ip_tun_build_state+0x116/0x2a0  On kernels built with GCC 15+ and `CONFIG_FORTIFY_SOURCE`, the fortified `memcpy()` got 0 sized destination with request of 4 bytes length:    static int ip_tun_parse_opts_geneve(...)   {       ...       attr = tb[LWTUNNEL_IP_OPT_GENEVE_DATA];       data_len = nla_len(attr); /* == 4 */        struct geneve_opt *opt = ip_tunnel_info_opts(info) + opts_len;       memcpy(opt-\u003eopt_data, nla_data(attr), data_len);       /*     ^^^^^^^^^^^^^ 0 since options_len is assigned afterwards */  Fixed by initializing the counter before the options are referenced. Matching what `tunnel_key_opts_set()` already does.",
  "id": "DEBIAN-CVE-2026-98240",
  "modified": "2026-10-07T04:47:39.463051172Z",
  "published": "2026-10-06T09:18:11.960Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://security-tracker.debian.org/tracker/CVE-2026-98240"
    }
  ],
  "upstream": [
    "CVE-2026-98240"
  ]
}