{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2024-50257",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2024-50257"
  ],
  "published": "2024-11-09T10:15:51Z",
  "summary": "netfilter: Fix use-after-free in get_info()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: Fix use-after-free in get_info()\n\nip6table_nat module unload has refcnt warning for UAF. call trace is:\n\nWARNING: CPU: 1 PID: 379 at kernel/module/main.c:853 module_put+0x6f/0x80\nModules linked in: ip6table_nat(-)\nCPU: 1 UID: 0 PID: 379 Comm: ip6tables Not tainted 6.12.0-rc4-00047-gc2ee9f594da8-dirty #205\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996),\nBIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014\nRIP: 0010:module_put+0x6f/0x80\nCall Trace:\n <TASK>\n get_info+0x128/0x180\n do_ip6t_get_ctl+0x6a/0x430\n nf_getsockopt+0x46/0x80\n ipv6_getsockopt+0xb9/0x100\n rawv6_getsockopt+0x42/0x190\n do_sock_getsockopt+0xaa/0x180\n __sys_getsockopt+0x70/0xc0\n __x64_sys_getsockopt+0x20/0x30\n do_syscall_64+0xa2/0x1a0\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nConcurrent execution of module unload and get_info() trigered the warning.\nThe root cause is as follows:\n\ncpu0\t\t\t\t      cpu1\nmodule_exit\n//mod->state = MODULE_STATE_GOING\n  ip6table_nat_exit\n    xt_unregister_template\n\tkfree(t)\n\t//removed from templ_list\n\t\t\t\t      getinfo()\n\t\t\t\t\t  t = xt_find_table_lock\n\t\t\t\t\t\tlist_for_each_entry(tmpl, &xt_templates[af]...)\n\t\t\t\t\t\t\tif (strcmp(tmpl->name, name))\n\t\t\t\t\t\t\t\tcontinue;  //table not found\n\t\t\t\t\t\t\ttry_module_get\n\t\t\t\t\t\tlist_for_each_entry(t, &xt_net->tables[af]...)\n\t\t\t\t\t\t\treturn t;  //not get refcnt\n\t\t\t\t\t  module_put(t->me) //uaf\n    unregister_pernet_subsys\n    //remove table from xt_net list\n\nWhile xt_table module was going away and has been removed from\nxt_templates list, we couldnt get refcnt of xt_table->me. Check\nmodule in xt_net->tables list re-traversal to fix it.",
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  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2024-50257"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ba22ea01348384df19cc1fabc7964be6e7189749"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/cb7c388b5967946f097afdb759b7c860305f2d96"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/6a1f088f9807f5166f58902d26246d0b88da03a8"
    },
    {
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      "url": "https://git.kernel.org/stable/c/bab3bb35c03b263c486833d50d50c081d9e9832b"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f48d258f0ac540f00fa617dac496c4c18b5dc2fa"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T11:52:36Z"
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}