{
  "affected": [
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:12",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "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"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "In the Linux kernel, the following vulnerability has been resolved:  net: mpls: clear inner_protocol when the last label is popped  skb_mpls_push() records the pre-encapsulation network header once, gated on !skb-\u003einner_protocol. skb_mpls_pop() never clears that record, so it outlives the encapsulation it describes.  Open vSwitch can then re-push MPLS onto a packet whose inner_network_header still points at the older, deeper offset: push a label, pop every label, recirculate (ovs_flow_key_update() re-derives key-\u003eeth.type and resets network_header, but leaves inner_*), then push again. ovs_fragment() trusts the record:  \tskb-\u003enetwork_header = skb-\u003einner_network_header;  so skb_network_offset() goes negative. The bound check is signed:  \tif (skb_network_offset(skb) \u003e MAX_L2_LEN)  a negative offset passes it, and prepare_frag() widens the value:  \tunsigned int hlen = skb_network_offset(skb); \tmemcpy(\u0026data-\u003el2_data, skb-\u003edata, hlen);  which is a ~4GiB memcpy out of a 30-byte per-CPU buffer.  Reproduced on v7.3-rc1. RDX is the truncated length, (unsigned int)(-8):    BUG: unable to handle page fault for address: ffffe8ffffc16000   #PF: supervisor write access in kernel mode   Oops: 0002 [#1] SMP KASAN NOPTI   RIP: 0010:memcpy+0x8/0x20   RDX: 00000000fffffff8 RSI: ffff888105d732db RDI: ffffe8ffffc16000    prepare_frag+0x3df/0x4e0    ovs_fragment+0x589/0x7e0    do_output+0x4ce/0x5e0    do_execute_actions+0x55d2/0x7b30    ovs_execute_actions+0xea/0x450  Same root-cause shape as commit 975b5b067f52 (\"ipv6: sr: restore network header before routing and forwarding\"): a stale network header offset reaching a consumer that widens it. Here it originates in the MPLS push/pop path.  Clear inner_protocol once the packet is no longer MPLS, so a later push re-records the current header. net/sched/act_mpls.c is the only other skb_mpls_pop() caller and gets the same fix; sch_frag.c saves and restores inner_protocol around fragmentation in the same way OVS does.",
  "id": "DEBIAN-CVE-2026-97612",
  "modified": "2026-09-26T04:47:36.363842828Z",
  "published": "2026-09-25T11:17:15.330Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://security-tracker.debian.org/tracker/CVE-2026-97612"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "upstream": [
    "CVE-2026-97612"
  ]
}