{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "7c37c7e00411b3d1e0c5292368317aca69d1f324"
            },
            {
              "fixed": "c0936c131a71657afc635d0db2ab096d15d473e1"
            },
            {
              "fixed": "3081702ea5aca0aeed9c1ade8eadf6cde8db6b7d"
            },
            {
              "fixed": "d536bf205c71f700f6de2086038c3e1d77724715"
            },
            {
              "fixed": "18506d7263768d76ac8e057ba55a4d9da50aad66"
            },
            {
              "fixed": "6347c5314cee49f364aaf2e40ff15415a57a116e"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.13.0"
            },
            {
              "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": "7.1.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64576.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnexthop: initialize extack in nh_res_bucket_migrate()\n\nnh_res_bucket_migrate() passes an uninitialized netlink_ext_ack to\ncall_nexthop_res_bucket_notifiers(). When\nnh_notifier_res_bucket_info_init() fails (e.g. the kzalloc returns\n-ENOMEM), the error is propagated back before any notifier sets\nextack._msg, and the error path formats the stale pointer with\npr_err_ratelimited(\"%s\\n\", extack._msg). With CONFIG_INIT_STACK_NONE\nthis dereferences uninitialized stack memory:\n\n  Oops: general protection fault, probably for non-canonical address ...\n  KASAN: maybe wild-memory-access in range [...]\n  RIP: 0010:string (lib/vsprintf.c:730)\n   vsnprintf (lib/vsprintf.c:2945)\n   _printk (kernel/printk/printk.c:2504)\n   nh_res_bucket_migrate (net/ipv4/nexthop.c:1816)\n   nh_res_table_upkeep (net/ipv4/nexthop.c:1866)\n   rtm_new_nexthop (net/ipv4/nexthop.c:3323)\n   rtnetlink_rcv_msg (net/core/rtnetlink.c:7076)\n   netlink_sendmsg (net/netlink/af_netlink.c:1900)\n  Kernel panic - not syncing: Fatal exception\n\nZero-initialize extack so _msg is NULL on error paths that never set it.",
  "id": "CVE-2026-64576",
  "modified": "2026-08-06T03:31:22.978325770Z",
  "published": "2026-08-05T08:09:32.529Z",
  "references": [
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/18506d7263768d76ac8e057ba55a4d9da50aad66"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3081702ea5aca0aeed9c1ade8eadf6cde8db6b7d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6347c5314cee49f364aaf2e40ff15415a57a116e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c0936c131a71657afc635d0db2ab096d15d473e1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d536bf205c71f700f6de2086038c3e1d77724715"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64576.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64576"
    }
  ],
  "schema_version": "1.8.0",
  "summary": "nexthop: initialize extack in nh_res_bucket_migrate()"
}