{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "6fff607e2f14bd7c63c06c464a6f93b8efbabe28"
            },
            {
              "fixed": "f14609d8146707452e0822f3c8154674ce677251"
            },
            {
              "fixed": "d81b323af2dcee47573907ccb89c0df9b45cb2e2"
            },
            {
              "fixed": "aeb95146848d12206e1b2cfacd4f40e21ce81d94"
            },
            {
              "fixed": "96b72672ce849a1402730238e64d9b20bf06a96d"
            },
            {
              "fixed": "3075c21d2d76c0067f4a382765b43d6cc10470f1"
            },
            {
              "fixed": "5e19028667963fb371ebb00cecc2a473ef92056b"
            },
            {
              "fixed": "63f64a510c7917658ddf4d073ece73914ee25346"
            },
            {
              "fixed": "f72eed9b84fb771019a955908132410a9ba9ea3f"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.20.0"
            },
            {
              "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": "6.2.0"
            },
            {
              "fixed": "6.6.143"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.93"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.35"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "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-2026-63926.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: sockmap: fix tail fragment offset in bpf_msg_push_data\n\nWhen bpf_msg_push_data() inserts data in the middle of a scatterlist\nentry, it splits the original entry into a left fragment and a right\nfragment.\n\nThe right fragment offset is page-local, but the code advances it with\n`start`, which is the message-global insertion point. For inserts into a\nnon-first SG entry, this over-advances the offset and leaves the split\nlayout inconsistent.\n\nAdvance the right fragment offset by the fragment-local delta,\n`start - offset`, which matches the length removed from the front of the\noriginal entry.",
  "id": "CVE-2026-63926",
  "modified": "2026-07-22T05:29:51.144202409Z",
  "published": "2026-07-19T14:55:27.154Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3075c21d2d76c0067f4a382765b43d6cc10470f1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5e19028667963fb371ebb00cecc2a473ef92056b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/63f64a510c7917658ddf4d073ece73914ee25346"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/96b72672ce849a1402730238e64d9b20bf06a96d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/aeb95146848d12206e1b2cfacd4f40e21ce81d94"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d81b323af2dcee47573907ccb89c0df9b45cb2e2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f14609d8146707452e0822f3c8154674ce677251"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f72eed9b84fb771019a955908132410a9ba9ea3f"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63926.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-63926"
    },
    {
      "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:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "bpf: sockmap: fix tail fragment offset in bpf_msg_push_data"
}