xfrm: iptfs: preserve shared-frag marker in iptfs_consume_frags()

{
  "id": "41c10e32758ef315094ec49979a4d46169d75b75dae8fffa2df77e323beba2da",
  "url": "https://osv.dev/vulnerability/CVE-2026-53363",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "xfrm: iptfs: preserve shared-frag marker in iptfs_consume_frags()",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: xfrm: iptfs: preserve shared-frag marker in iptfs_consume_frags() iptfs_consume_frags() transfers paged fragments from one socket buffer to another but fails to propagate the SKBFL_SHARED_FRAG flag. This is the same class of bug that was fixed in skb_try_coalesce() for CVE-2026-46300: when fragments backed by read-only page-cache pages are merged, the marker indicating their shared nature must be preserved so that ESP can decide correctly whether in-place encryption is safe. Apply the same two-line fix used in skb_try_coalesce() to iptfs_consume_frags().",
    "evidence": "osv:CVE-2026-53363",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.18.36",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.0.13",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "critical",
    "structured": {
      "id": "CVE-2026-53363",
      "aliases": [
        "CVE-2026-53363"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "b96ba312e21c9b7ac1526829b9640ddc06695c0b"
                },
                {
                  "fixed": "dd66f7f6e360ee82cd905517726f8e9091265de5"
                },
                {
                  "fixed": "c885d111ed9f5a0a1f3cc4e87a50db6518abaa6c"
                },
                {
                  "fixed": "e9096a5a170e7ecd6467bc2e08668ec39897cda7"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53363.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.14.0"
                },
                {
                  "fixed": "6.18.36"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.0.13"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53363.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:46.386284304Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/c885d111ed9f5a0a1f3cc4e87a50db6518abaa6c",
        "https://git.kernel.org/stable/c/dd66f7f6e360ee82cd905517726f8e9091265de5",
        "https://git.kernel.org/stable/c/e9096a5a170e7ecd6467bc2e08668ec39897cda7",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53363.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-53363",
        "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/2026/53xxx/CVE-2026-53363.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-53363",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 514438,
  "published_at": "2026-07-10T11:55:31.82+00:00"
}