{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "42df6e1d221dddc0f2acf2be37e68d553ad65f96"
            },
            {
              "fixed": "4fee43759b489559a491f7c95f9bfa7a1d0c7a10"
            },
            {
              "fixed": "568931f26af4727a51e8521f72efbc78d3b82410"
            },
            {
              "fixed": "d01c913febead04a01a5f3a6374d1f45504dc523"
            },
            {
              "fixed": "f68305267ebda7e839b5e8f77e8d77535a3d5a0f"
            },
            {
              "fixed": "d07955dd34ecae17d35d8c7d0a273a3fba653a8c"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.6.148"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.101"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.42"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "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-2026-72254.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nft_fib: reject fib expression on the netdev egress hook\n\nA fib expression in a netdev egress base chain dereferences nft_in(pkt),\nNULL on the transmit path, causing a NULL pointer dereference at eval.\nnft_fib_validate() masks the hook with NF_INET_* values, but netdev hook\nnumbers are a separate enum that aliases them (NF_NETDEV_EGRESS ==\nNF_INET_LOCAL_IN), so an egress chain passes validation and then faults.\n\nAdd nft_fib_netdev_validate() that limits each result/flag to the netdev\nhook where the device it reads exists: the input-device cases (OIF,\nOIFNAME, ADDRTYPE with F_IIF) to ingress, the output-device case (ADDRTYPE\nwith F_OIF) to egress, ADDRTYPE with no device flag to both. Also restrict\nnft_fib_validate() to NFPROTO_IPV4/IPV6/INET so its NF_INET_* masks are\nnot applied to another family's hooks.",
  "id": "CVE-2026-72254",
  "modified": "2026-08-18T03:31:16.580413534Z",
  "published": "2026-08-15T05:54:42.239Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4fee43759b489559a491f7c95f9bfa7a1d0c7a10"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/568931f26af4727a51e8521f72efbc78d3b82410"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d01c913febead04a01a5f3a6374d1f45504dc523"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d07955dd34ecae17d35d8c7d0a273a3fba653a8c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f68305267ebda7e839b5e8f77e8d77535a3d5a0f"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72254.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-72254"
    },
    {
      "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:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "netfilter: nft_fib: reject fib expression on the netdev egress hook"
}