xsk: Fix fragment node deletion to prevent buffer leak

{
  "id": "83998e43672254eac8d3904be95aedb8bf4a167e595eab2dee9b5c8205780cd9",
  "url": "https://osv.dev/vulnerability/CVE-2026-23326",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "xsk: Fix fragment node deletion to prevent buffer leak",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: xsk: Fix fragment node deletion to prevent buffer leak After commit b692bf9a7543 (\"xsk: Get rid of xdp_buff_xsk::xskb_list_node\"), the list_node field is reused for both the xskb pool list and the buffer free list, this causes a buffer leak as described below. xp_free() checks if a buffer is already on the free list using list_empty(&xskb->list_node). When list_del() is used to remove a node from the xskb pool list, it doesn't reinitialize the node pointers. This means list_empty() will return false even after the node has been removed, causing xp_free() to incorrectly skip adding the buffer to the free list. Fix this by using list_del_init() instead of list_del() in all fragment handling paths, this ensures the list node is reinitialized after removal, allowing the list_empty() to work correctly.",
    "evidence": "osv:CVE-2026-23326",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
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            "value": "6.18.17",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.19.7",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-23326",
      "aliases": [
        "CVE-2026-23326"
      ],
      "affected": [
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              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-23326.json"
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        {
          "ranges": [
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              "type": "ECOSYSTEM",
              "events": [
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                  "introduced": "6.13.0"
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                  "fixed": "6.18.17"
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              "type": "ECOSYSTEM",
              "events": [
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                  "introduced": "6.19.0"
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          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
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          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-23326.json"
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      ],
      "modified": "2026-10-28T02:30:45.878873944Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/2a9ea988465ece5b6896b1bdc144170a64e84c35",
        "https://git.kernel.org/stable/c/5172adf9efb8298a52f4dcdc3f98d4d9d1e06a6d",
        "https://git.kernel.org/stable/c/60abb0ac11dccd6b98fd9182bc5f85b621688861",
        "https://git.kernel.org/stable/c/645c6d8376ad4913cbffe0e0c2cca0c4febbe596",
        "https://git.kernel.org/stable/c/b38cbd4af5034635cff109e08788c63f956f3a69",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23326.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-23326",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23326.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-23326",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 513510,
  "published_at": "2026-03-25T10:27:19.021+00:00"
}