{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-53349",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2026-53349"
  ],
  "published": "2026-07-01T13:34:53Z",
  "summary": "netfilter: nf_conntrack: destroy stale expectfn expectations on unregister",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_conntrack: destroy stale expectfn expectations on unregister\n\nNAT helpers such as nf_nat_h323 store a raw pointer to module text in\nexp->expectfn (e.g. ip_nat_q931_expect). nf_ct_helper_expectfn_unregister()\nonly unlinks the callback descriptor and never walks the expectation table,\nso an expectation pending at module removal survives with a dangling\nexp->expectfn into freed module text.\n\nWhen the expected connection arrives, init_conntrack() invokes\nexp->expectfn(), now a stale pointer into the unloaded module. Reproduced\non a KASAN build by loading the H.323 helpers, creating a Q.931\nexpectation, unloading nf_nat_h323, then connecting to the expected port:\n\n Oops: int3: 0000 [#1] SMP KASAN NOPTI\n RIP: 0010:0xffffffffa06102d1\n  init_conntrack.isra.0 (net/netfilter/nf_conntrack_core.c:1862)\n  nf_conntrack_in (net/netfilter/nf_conntrack_core.c:2049)\n  ipv4_conntrack_local (net/netfilter/nf_conntrack_proto.c:223)\n  nf_hook_slow (net/netfilter/core.c:619)\n  __ip_local_out (net/ipv4/ip_output.c:120)\n  __tcp_transmit_skb (net/ipv4/tcp_output.c:1715)\n  tcp_connect (net/ipv4/tcp_output.c:4374)\n  tcp_v4_connect (net/ipv4/tcp_ipv4.c:345)\n  __sys_connect (net/socket.c:2167)\n Modules linked in: nf_conntrack_h323 [last unloaded: nf_nat_h323]\n\nReaching the dangling state requires CAP_SYS_MODULE in the initial user\nnamespace to remove a NAT helper that still has live expectations, so this\nis a robustness fix; leaving an expectation pointing at freed text is wrong\nregardless.\n\nAdd nf_ct_helper_expectfn_destroy(), which walks the expectation table and\ndrops every expectation whose ->expectfn matches the descriptor being torn\ndown. Call it from each NAT helper's exit path after the existing RCU grace\nperiod, so no expectation outlives the code it points at and no extra\nsynchronize_rcu() is introduced. With the fix, the same reproducer runs to\ncompletion without the Oops.",
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      "url": "https://git.kernel.org/stable/c/f92c90a2a3e6ff6f9f7fe88fde9004b4ca8f956d"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/9d017671dcfcec23321fb7962dea624f9e71ddb1"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/bf8c0b5dd203be94c2ad50e264cec19267c6bd39"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c3009418f9fa1dcb3eb86f4d8c92583537b5faa3"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-07-01T13:34:53Z"
  }
}