{
  "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"
            },
            {
              "fixed": "7.2.8-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "In the Linux kernel, the following vulnerability has been resolved:  net: lan743x: fix RX checksum use-after-free  lan743x_rx_process_buffer() adds each non-first receive buffer to the head skb's frag_list.  On the last descriptor, lan743x_rx_trim_skb() linearizes the head and frees the fragment skb metadata.  The checksum-success path then writes ip_summed through the local skb pointer, which still points to the final fragment.  This causes a use-after-free write when a packet spans more than one receive buffer.  Set ip_summed on the surviving head skb instead.  Multi-buffer receive can occur after a live MTU increase because existing ring entries keep their old buffer size until they are replenished.  A KUnit test invoking lan743x_rx_process_buffer() with a two-buffer packet produced a one-byte KASAN use-after-free write before this change. The same test passed after the change.  The driver object also builds with W=1.  This was not tested on physical LAN743x hardware.",
  "id": "DEBIAN-CVE-2026-98239",
  "modified": "2026-10-08T09:47:36.067527667Z",
  "published": "2026-10-06T09:18:11.803Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://security-tracker.debian.org/tracker/CVE-2026-98239"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "upstream": [
    "CVE-2026-98239"
  ]
}