{
  "cveId": "CVE-2026-93105",
  "url": "https://patchblox.com/security/cve/CVE-2026-93105",
  "summary": "CVE-2026-93105 is fixed in linux on 1 platform, first by DEBIAN-CVE-2026-93105, released September 23, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "esp: do not unref managed frag pages in esp_ssg_unref()",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  esp: do not unref managed frag pages in esp_ssg_unref()  esp_ssg_unref() releases the page references held on the source scatterlist after the AEAD operation completes.  It calls skb_page_unref() on every frag page for an out-of-place transform (req-\u003Esrc != req-\u003Edst), and in the error path of esp_output_tail() (already_unref == true) on the request\u0027s own scatterlist.  This is wrong when the skb carries managed frags (SKBFL_MANAGED_FRAG_REFS).  Managed frags are owned by a zerocopy ubuf and the skb does not hold a per-frag page reference; io_uring SEND_ZC with a registered buffer attaches the bvec pages this way via io_sg_from_iter().  The rest of the stack honours this invariant: skb_release_data() skips the per-frag unref when SKBFL_MANAGED_FRAG_REFS is set, and skb_zcopy_managed() is the guard used at the other unref sites.  esp_ssg_unref() is missing that guard, so for a managed-frag skb it drops a page reference the skb never acquired.  This can underflow the page reference count and free a page that is still in use.  Guard the function with skb_zcopy_managed() so both unref paths are skipped for managed-frag skbs, matching skb_release_data().",
  "published": "2026-09-17T17:18:04Z",
  "severity": "Moderate",
  "cvss": 7.8,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.00176,
  "epssPercentile": 0.07116,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-93105",
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.12.115-2",
      "fix": "DEBIAN-CVE-2026-93105",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-93105",
      "released": "2026-09-23T19:19:02Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.2.6-1",
      "fix": "DEBIAN-CVE-2026-93105",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-93105",
      "released": "2026-09-23T19:19:02Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T01:18:40Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}