{
  "id": "CVE-2026-98239",
  "url": "https://spydr.io/cve/CVE-2026-98239",
  "published": "2026-10-06T09:18:11.803Z",
  "modified": "2026-10-06T09:18:11.803Z",
  "score": null,
  "severity": null,
  "cvss_version": null,
  "vector": null,
  "score_source": null,
  "epss": 0.0018,
  "epss_percentile": 0.06919,
  "exploited": false,
  "kev": null,
  "ssvc_exploitation": null,
  "vendors": [
    "Linux"
  ],
  "products": [
    "Linux"
  ],
  "cwes": [],
  "description": "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.",
  "status": "Received",
  "score_type": null,
  "scores": {
    "cvss_v40": null,
    "cvss_v31": null,
    "cvss_v30": null
  },
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/0e52886c4324c9897c2c62f92be3dc8316cee67e",
      "tags": []
    },
    {
      "url": "https://git.kernel.org/stable/c/161a403c8625e152de03d1da22bbf9cda6dc9f9f",
      "tags": []
    },
    {
      "url": "https://git.kernel.org/stable/c/5c216bfa9fb7b36804485e67975e9c98055b31ef",
      "tags": []
    },
    {
      "url": "https://git.kernel.org/stable/c/6fe5c3a2503983abb431d93faeadfc7f5e6a7e33",
      "tags": []
    },
    {
      "url": "https://git.kernel.org/stable/c/a58024835c704419bb46d2a34e5223f65605f958",
      "tags": []
    },
    {
      "url": "https://git.kernel.org/stable/c/a9ce4053dc945c5372dedba5017ee675b30dc0c5",
      "tags": []
    }
  ],
  "nvd_url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98239",
  "covered_in": [],
  "attribution": [
    {
      "source": "NVD",
      "url": "https://nvd.nist.gov",
      "notice": "This product uses data from the NVD API but is not endorsed or certified by the NVD."
    },
    {
      "source": "CISA KEV",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "notice": "Known exploited vulnerabilities from the CISA KEV catalog."
    },
    {
      "source": "FIRST EPSS",
      "url": "https://www.first.org/epss",
      "notice": "Exploit prediction scores from FIRST EPSS."
    }
  ]
}