{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-31665",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-31665"
  ],
  "published": "2026-04-24T14:47:31Z",
  "summary": "netfilter: nft_ct: fix use-after-free in timeout object destroy",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nft_ct: fix use-after-free in timeout object destroy\n\nnft_ct_timeout_obj_destroy() frees the timeout object with kfree()\nimmediately after nf_ct_untimeout(), without waiting for an RCU grace\nperiod. Concurrent packet processing on other CPUs may still hold\nRCU-protected references to the timeout object obtained via\nrcu_dereference() in nf_ct_timeout_data().\n\nAdd an rcu_head to struct nf_ct_timeout and use kfree_rcu() to defer\nfreeing until after an RCU grace period, matching the approach already\nused in nfnetlink_cttimeout.c.\n\nKASAN report:\n BUG: KASAN: slab-use-after-free in nf_conntrack_tcp_packet+0x1381/0x29d0\n Read of size 4 at addr ffff8881035fe19c by task exploit/80\n\n Call Trace:\n  nf_conntrack_tcp_packet+0x1381/0x29d0\n  nf_conntrack_in+0x612/0x8b0\n  nf_hook_slow+0x70/0x100\n  __ip_local_out+0x1b2/0x210\n  tcp_sendmsg_locked+0x722/0x1580\n  __sys_sendto+0x2d8/0x320\n\n Allocated by task 75:\n  nft_ct_timeout_obj_init+0xf6/0x290\n  nft_obj_init+0x107/0x1b0\n  nf_tables_newobj+0x680/0x9c0\n  nfnetlink_rcv_batch+0xc29/0xe00\n\n Freed by task 26:\n  nft_obj_destroy+0x3f/0xa0\n  nf_tables_trans_destroy_work+0x51c/0x5c0\n  process_one_work+0x2c4/0x5a0",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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      "url": "https://www.cve.org/CVERecord?id=CVE-2026-31665"
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      "cvss_v3_score": 7.8,
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      "scenario": "AV:L - The vulnerable timeout object is created and destroyed through nftables netlink operations, and the stale pointer is exercised by local packet/syscall activity such as sendto through conntrack. Netfilter/nftables control-plane access is a local attack surface, not a remotely unauthenticated one.\nAC:L - The attacker can create the timeout object, attach it to conntrack state, delete it, and generate concurrent packet processing themselves. The UAF race is between attacker-controlled netlink teardown and attacker-controlled traffic, with no external condition required.\nPR:L - nfnetlink requires CAP_NET_ADMIN, but this is checked against the network namespace user_ns, so an unprivileged user can reach it via user and network namespaces on common configurations. This is therefore low privileges rather than real init-namespace root.\nUI:N - No victim interaction is required once the attacker has local execution. The attacker can perform the nftables operations and packet generation directly.\nS:U - The vulnerability is in the kernel netfilter/conntrack subsystem and impacts the same kernel security authority. It does not cross a VM, hypervisor, or separate authorization boundary.\nC:H - This is a use-after-free of an RCU-protected conntrack timeout object during packet processing. A kernel UAF can be shaped through heap reuse and is defensibly treated as enabling high confidentiality impact.\nI:H - Use-after-free in kernel heap memory can be leveraged through heap spraying and object replacement toward memory corruption or control-flow manipulation. Under the required overestimation rule, integrity impact is high.\nA:H - The fix commit includes a KASAN slab-use-after-free report in nf_conntrack_tcp_packet, and such UAFs can crash or destabilize the kernel. Repeated local triggering makes high availability impact appropriate."
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}