GHSA-6C6H-95CX-J99F

Vulnerability from github – Published: 2026-07-19 18:31 – Updated: 2026-07-20 15:31
VLAI
Details

In the Linux kernel, the following vulnerability has been resolved:

xfrm: esp: restore combined single-frag length gate

The ESP out-of-place fast path appends the trailer in esp_output_head() before esp_output_tail() allocates the destination page frag. The head-side gate currently checks skb->data_len and tailen separately, but the tail code allocates a single destination frag from the combined post-trailer skb->data_len.

Reject the page-frag fast path when the combined aligned length exceeds a page. Otherwise skb_page_frag_refill() may fall back to a single page while the destination sg still spans the combined skb->data_len.

Restore this combined-length page gate for both IPv4 and IPv6.

Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2026-63912"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-19T16:17:09Z",
    "severity": "CRITICAL"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: esp: restore combined single-frag length gate\n\nThe ESP out-of-place fast path appends the trailer in esp_output_head()\nbefore esp_output_tail() allocates the destination page frag. The\nhead-side gate currently checks skb-\u003edata_len and tailen separately, but\nthe tail code allocates a single destination frag from the combined\npost-trailer skb-\u003edata_len.\n\nReject the page-frag fast path when the combined aligned length exceeds a\npage. Otherwise skb_page_frag_refill() may fall back to a single page while\nthe destination sg still spans the combined skb-\u003edata_len.\n\nRestore this combined-length page gate for both IPv4 and IPv6.",
  "id": "GHSA-6c6h-95cx-j99f",
  "modified": "2026-07-20T15:31:50Z",
  "published": "2026-07-19T18:31:45Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-63912"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/322e48187e0245ab2fff6fec2220b0cae677dbec"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/36519e3d941fc99d3b52c134dbaf311f987a4708"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/566295735530ee513326049b0540f32ec050bf2e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5d7ab86e2b6bc23054616bf6ac562013bf60af8c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/65f3b3fc2347b89fe21db1e92c7681368415f095"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b84091ceddc9f133229dceab3ccc930bf27f9cba"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c093468aea8277f77272a4f199b2e15e19cabb59"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/dfa0d7b0ff1eb6b2c416b8fdb9b4f2cefba57a40"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}



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