{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "d30301ba4b07ac92eb38353a111833b009003170"
            },
            {
              "fixed": "0880c4ed122d0cddc9f29a2b28f055d1f24f0fca"
            },
            {
              "fixed": "fa7395c02d95e51bad2952325d2d6503bfbad437"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72248.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: flowtable: support IPIP tunnel with direct xmit\n\nThe combination of IPIP tunnel with direct xmit, eg. bridge device,\nbreaks because no dst_entry is provided to check the skb headroom and to\nset the iph-\u003efrag_off field. This leads to invalid dst usage and can\ntrigger a crash in the tunnel transmit path.\n\nFix this by moving dst_cache and dst_cookie out of the runtime union so\nthat they can be shared by neighbour, xfrm, and direct tunnel flows.\nFor FLOW_OFFLOAD_XMIT_DIRECT tuples carrying tunnel metadata, preserve\nroute state in these shared fields and release it through the common\ndst release path.\n\nSince dst_entry is now available to the three supported xmit modes and\ndst_release() already deals with NULL dst, remove the xmit type check\nin nft_flow_dst_release(). Moreover, skip the check if the dst entry\nis NULL in nf_flow_dst_check() which is now the case for the direct\nxmit case.\n\nBased on patch from Rein Wei \u003cn05ec@lzu.edu.cn\u003e.",
  "id": "CVE-2026-72248",
  "modified": "2026-08-18T03:31:05.254857347Z",
  "published": "2026-08-15T05:54:36.535Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0880c4ed122d0cddc9f29a2b28f055d1f24f0fca"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fa7395c02d95e51bad2952325d2d6503bfbad437"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72248.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-72248"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "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": "netfilter: flowtable: support IPIP tunnel with direct xmit"
}