{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "c075c3ea031757f8ea2d34567565b61a868c08d5"
            },
            {
              "fixed": "566295735530ee513326049b0540f32ec050bf2e"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "a583f2f3c8788bffd7fd7baeb76bd6d80543d7ea"
            },
            {
              "fixed": "5d7ab86e2b6bc23054616bf6ac562013bf60af8c"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "5bd8baab087dff657e05387aee802e70304cc813"
            },
            {
              "fixed": "36519e3d941fc99d3b52c134dbaf311f987a4708"
            },
            {
              "fixed": "322e48187e0245ab2fff6fec2220b0cae677dbec"
            },
            {
              "fixed": "b84091ceddc9f133229dceab3ccc930bf27f9cba"
            },
            {
              "fixed": "c093468aea8277f77272a4f199b2e15e19cabb59"
            },
            {
              "fixed": "65f3b3fc2347b89fe21db1e92c7681368415f095"
            },
            {
              "fixed": "dfa0d7b0ff1eb6b2c416b8fdb9b4f2cefba57a40"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "2c66b0c95bb0aa7652ba1eba293d0d5993b35a38"
            },
            {
              "last_affected": "ef6f83df1209a7d9bd1c605a62457d4c00f9179e"
            },
            {
              "last_affected": "3defefd22ad5fbbe639b6157fb7e6311b2bf333d"
            },
            {
              "last_affected": "b657030870bb5351c5b1e84d4e9f186da6ca0496"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "5.10.113"
            },
            {
              "fixed": "5.10.259"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "5.15.36"
            },
            {
              "fixed": "5.15.210"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "4.14.288"
            },
            {
              "fixed": "4.15"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "4.19.252"
            },
            {
              "fixed": "4.20"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "5.4.205"
            },
            {
              "fixed": "5.5"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "5.17.5"
            },
            {
              "fixed": "5.18"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "5.10.259"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.210"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.176"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.18.0"
            },
            {
              "fixed": "6.6.143"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.12.93"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.18.35"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "7.0.12"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63912.json"
  },
  "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": "CVE-2026-63912",
  "modified": "2026-07-22T05:29:45.008697322Z",
  "published": "2026-07-19T14:55:17.188Z",
  "references": [
    {
      "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"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63912.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-63912"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "xfrm: esp: restore combined single-frag length gate"
}