{
  "affected": [
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:14",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "7.1.5-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "In the Linux kernel, the following vulnerability has been resolved:  net: dst_metadata: fix false-positive memcpy overflow in tun_dst_unclone  kmalloc_flex() in metadata_dst_alloc() sets __counted_by for the structure to the options_len, which is then initialized to zero. Later, we're initializing the structure by copying the tunnel info together with the options, and this triggers a warning for a potential memcpy overflow, since the compiler estimates that the options can't fit into the structure, even though the memory for them is actually allocated.   memcpy: detected buffer overflow: 104 byte write of buffer size 96  WARNING: CPU: X PID: Y at lib/string_helpers.c:1036 __fortify_report   skb_tunnel_info_unclone+0x179/0x190   geneve_xmit+0x7fe/0xe00  The issue is triggered when built with clang and source fortification.  Fix that by doing the copy in two stages: first - the main data with the options_len, then the options.  This way the correct length should be known at the time of the copy.  It would be better if the options_len never changed after allocation, but the allocation code is a little separate from the initialization and it would be awkward and potentially dangerous to return a struct with options_len set to a non-zero value from the metadata_dst_alloc().  Another option would be to use ip_tunnel_info_opts_set(), but it is doing too many unnecessary operations for the use case here.",
  "id": "DEBIAN-CVE-2026-80615",
  "modified": "2026-09-14T16:47:49.525018197Z",
  "published": "2026-08-28T08:16:45.523Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://security-tracker.debian.org/tracker/CVE-2026-80615"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "upstream": [
    "CVE-2026-80615"
  ]
}