{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "a6c76c17df021b141b0d306828c9fe4ba2d2717c"
            },
            {
              "fixed": "8150b5365f026e72250cacc527ea00be30f40105"
            },
            {
              "fixed": "d007056868723de9c0cc3f5ffaad47a8d468b9a4"
            },
            {
              "fixed": "cb8be318b4432abd88d3172ec157330f27a5f7a7"
            },
            {
              "fixed": "b8d2ea75c76abcd0d72679c2f488271f573e32fb"
            },
            {
              "fixed": "f2f152e94a67bc746afaf05a1b2702c195553112"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.6.0"
            },
            {
              "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-2026-64572.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv4: fib: free fib_alias with kfree_rcu() on insert error path\n\nfib_table_insert() publishes new_fa into the leaf's fa_list with\nfib_insert_alias() before calling the fib entry notifiers. When a\nnotifier fails, the error path removes new_fa with fib_remove_alias()\n(hlist_del_rcu) and frees it right away with kmem_cache_free().\n\nfib_table_lookup() walks that list under rcu_read_lock() only, so a\nconcurrent lookup that already reached new_fa keeps reading it after the\nfree:\n\n BUG: KASAN: slab-use-after-free in fib_table_lookup (net/ipv4/fib_trie.c:1601)\n Read of size 1 at addr ffff88810676d4eb by task exploit/297\n Call Trace:\n  fib_table_lookup (net/ipv4/fib_trie.c:1601)\n  ip_route_output_key_hash_rcu (net/ipv4/route.c:2814)\n  ip_route_output_key_hash (net/ipv4/route.c:2705)\n  __ip4_datagram_connect (net/ipv4/datagram.c:49)\n  udp_connect (net/ipv4/udp.c:2144)\n  __sys_connect (net/socket.c:2167)\n  __x64_sys_connect (net/socket.c:2173)\n  do_syscall_64\n  entry_SYSCALL_64_after_hwframe\n which belongs to the cache ip_fib_alias of size 56\n\nTriggering the error path needs CAP_NET_ADMIN and a registered fib\nnotifier that can reject a route; a netdevsim device whose IPv4 FIB\nresource is exhausted is enough.\n\nFree new_fa with alias_free_mem_rcu(), as fib_table_delete() already\ndoes for a fib_alias removed from the trie.",
  "id": "CVE-2026-64572",
  "modified": "2026-08-07T03:30:39.128068577Z",
  "published": "2026-08-05T08:08:09.068Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8150b5365f026e72250cacc527ea00be30f40105"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b8d2ea75c76abcd0d72679c2f488271f573e32fb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cb8be318b4432abd88d3172ec157330f27a5f7a7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d007056868723de9c0cc3f5ffaad47a8d468b9a4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f2f152e94a67bc746afaf05a1b2702c195553112"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64572.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64572"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.8.0",
  "summary": "ipv4: fib: free fib_alias with kfree_rcu() on insert error path"
}