{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "680aea08e78c003292415518ad270bc20f9c80b1"
            },
            {
              "fixed": "96f3fbb8575593657c7e80786dc3251d2fe3931b"
            },
            {
              "fixed": "81f0deb02a5b5477f236bbbaed1149b779a8632b"
            },
            {
              "fixed": "72d9d17092bb37b0717f12042a0817d01a1f9e78"
            },
            {
              "fixed": "ad1c9f1b98c92609e9bb2ae8f05916defc3b0a54"
            },
            {
              "fixed": "c1f48d1c2d5e9efd904dbbc2f2b3d41543e55c49"
            },
            {
              "fixed": "ad2b3a68b8a7d5d27de88e05674e4adb1ce46d88"
            },
            {
              "fixed": "d3daa33c7af92e38f2274bbd2576f58bfbaf89e6"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.12.0"
            },
            {
              "fixed": "5.15.224"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.191"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.160"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.113"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.57"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.11"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/99xxx/CVE-2026-99072.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv4: stop route notification sizing when nexthop group shrinks\n\nCommit 680aea08e78c (\"net: ipv4: Emit notification when fib\nhardware flags are changed\") added an RCU-only fib_nlmsg_size() call\nfor asynchronous hardware flag notifications.\n\nfib_nlmsg_size() checks fib_info_num_path() before each iteration,\nthen fib_info_nhc() independently reloads nh-\u003enh_grp. If\nRTM_NEWNEXTHOP replaces a group with fewer paths between those loads,\nfib_info_nhc() returns NULL and fib_nexthop_nlmsg_size() dereferences\nit.\n\nStop sizing when the indexed path is absent. Nexthop groups are\ndense, so the current snapshot has no later path.",
  "id": "CVE-2026-99072",
  "modified": "2026-11-01T02:31:07.229143851Z",
  "published": "2026-10-23T12:23:15.735Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/72d9d17092bb37b0717f12042a0817d01a1f9e78"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/81f0deb02a5b5477f236bbbaed1149b779a8632b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/96f3fbb8575593657c7e80786dc3251d2fe3931b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ad1c9f1b98c92609e9bb2ae8f05916defc3b0a54"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ad2b3a68b8a7d5d27de88e05674e4adb1ce46d88"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c1f48d1c2d5e9efd904dbbc2f2b3d41543e55c49"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d3daa33c7af92e38f2274bbd2576f58bfbaf89e6"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/99xxx/CVE-2026-99072.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-99072"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.2",
  "summary": "ipv4: stop route notification sizing when nexthop group shrinks"
}