{
  "affected": [
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:14",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.19.11-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "In the Linux kernel, the following vulnerability has been resolved:  xfrm: iptfs: fix skb_put() panic on non-linear skb during reassembly  In iptfs_reassem_cont(), IP-TFS attempts to append data to the new inner packet 'newskb' that is being reassembled. First a zero-copy approach is tried if it succeeds then newskb becomes non-linear.  When a subsequent fragment in the same datagram does not meet the fast-path conditions, a memory copy is performed. It calls skb_put() to append the data and as newskb is non-linear it triggers SKB_LINEAR_ASSERT check.   Oops: invalid opcode: 0000 [#1] SMP NOPTI  [...]  RIP: 0010:skb_put+0x3c/0x40  [...]  Call Trace:   \u003cIRQ\u003e   iptfs_reassem_cont+0x1ab/0x5e0 [xfrm_iptfs]   iptfs_input_ordered+0x2af/0x380 [xfrm_iptfs]   iptfs_input+0x122/0x3e0 [xfrm_iptfs]   xfrm_input+0x91e/0x1a50   xfrm4_esp_rcv+0x3a/0x110   ip_protocol_deliver_rcu+0x1d7/0x1f0   ip_local_deliver_finish+0xbe/0x1e0   __netif_receive_skb_core.constprop.0+0xb56/0x1120   __netif_receive_skb_list_core+0x133/0x2b0   netif_receive_skb_list_internal+0x1ff/0x3f0   napi_complete_done+0x81/0x220   virtnet_poll+0x9d6/0x116e [virtio_net]   __napi_poll.constprop.0+0x2b/0x270   net_rx_action+0x162/0x360   handle_softirqs+0xdc/0x510   __irq_exit_rcu+0xe7/0x110   irq_exit_rcu+0xe/0x20   common_interrupt+0x85/0xa0   \u003c/IRQ\u003e   \u003cTASK\u003e  Fix this by checking if the skb is non-linear. If it is, linearize it by calling skb_linearize(). As the initial allocation of newskb originally reserved enough tailroom for the entire reassembled packet we do not need to check if we have enough tailroom or extend it.",
  "id": "DEBIAN-CVE-2026-31517",
  "modified": "2026-09-14T16:47:36.658579468Z",
  "published": "2026-04-22T14:16:51.273Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://security-tracker.debian.org/tracker/CVE-2026-31517"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "upstream": [
    "CVE-2026-31517"
  ]
}