{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-64189",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-64189"
  ],
  "published": "2026-07-20T16:28:05Z",
  "summary": "netfilter: ipset: fix race between dump and ip_set_list resize",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: ipset: fix race between dump and ip_set_list resize\n\nThe release path of ip_set_dump_do() and ip_set_dump_done() read\ninst->ip_set_list via ip_set_ref_netlink(), a plain rcu_dereference_raw()\nof the array pointer. These run from netlink_recvmsg() without the nfnl\nmutex and without an RCU read-side critical section.\n\nA concurrent ip_set_create() can grow the array: it publishes the new\narray, calls synchronize_net() and then kvfree()s the old one. Since the\ndump paths read the array outside any RCU reader, synchronize_net() does\nnot wait for them and the old array can be freed while they still index\ninto it, causing a use-after-free.\n\nThe dumped set itself stays pinned via set->ref_netlink, so only the\narray load needs protecting. Take rcu_read_lock() around it, matching\nip_set_get_byname() and __ip_set_put_byindex().\n\n  BUG: KASAN: slab-use-after-free in ip_set_dump_do (net/netfilter/ipset/ip_set_core.c:1697)\n  Read of size 8 at addr ffff88800b5c4018 by task exploit/150\n  Call Trace:\n   ...\n   kasan_report (mm/kasan/report.c:595)\n   ip_set_dump_do (net/netfilter/ipset/ip_set_core.c:1697)\n   netlink_dump (net/netlink/af_netlink.c:2325)\n   netlink_recvmsg (net/netlink/af_netlink.c:1976)\n   sock_recvmsg (net/socket.c:1159)\n   __sys_recvfrom (net/socket.c:2315)\n   ...\n  Oops: general protection fault, probably for non-canonical address ... KASAN NOPTI\n  KASAN: maybe wild-memory-access in range [0x02d6...d0-0x02d6...d7]\n  RIP: 0010:ip_set_dump_do (net/netfilter/ipset/ip_set_core.c:1698)\n  Kernel panic - not syncing: Fatal exception",
  "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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    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/e8a9976b61f1bc4aa7fd25fa26726dfdf2adf710"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/96fbafc20ebd9a613736c2998b89c539fe3042f5"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ff86ea9b7fdf70564e60436fbee68c96bc459943"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/81d54c766337b923eec26da0a13406760b091093"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/e8ee198bbc04a32d336e79160fde980e0235b39f"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/7cd9103283b26b917360ec99d7d2f2d761bcf1ab"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-17T05:24:08Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The vulnerable dump and resize paths are reached through local NETLINK_NETFILTER send and receive syscalls, not through remotely received packets.\nAC:L - The attacker controls both sides by issuing an ipset dump and concurrent CREATE requests that grow ip_set_list, and can repeat the race without any victim-controlled condition.\nPR:L - NFNETLINK requires CAP_NET_ADMIN in the network namespace's owning user namespace, which an unprivileged user can obtain through user and network namespaces on deployments permitting unprivileged user namespaces.\nUI:N - After obtaining local execution, the attacker can trigger both racing operations without any action by another user.\nS:U - Exploitation compromises the kernel of the same host and constitutes standard local privilege escalation rather than crossing a VM, hypervisor, or IOMMU boundary.\nC:H - Reclaiming the freed array can make the loaded struct ip_set pointer attacker-influenced, after which variant-pointer dereferences can enable kernel code execution and arbitrary memory disclosure.\nI:H - The release path performs an indirect uref callback and decrements ref_netlink through the stale pointer, providing control-flow and kernel-memory-write opportunities after heap reclamation.\nA:H - The reported use-after-free produced a general-protection fault and kernel panic, and an attacker can trigger the race repeatedly."
    }
  }
}