{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-74565",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-74565"
  ],
  "published": "2026-08-15T12:28:42Z",
  "summary": "netfilter: nf_tables: make nft_object rhltable per table",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_tables: make nft_object rhltable per table\n\nThe nft_object rhltable is global, this allows for accessing objects\nthat are being dismangled from lookup path by other existing netns.\nGiven the nft_obj_destroy() releases the object inmediately, this might\nlead to use-after-free of these objects that are being released.\nMake the existing rhltable per table to address this issue to deal with\nwith the nft_rcv_nl_event() path too.\n\nUpdate nft_obj_lookup() to take the table as non-const, otherwise,\ncompiler complains when passing the objname_ht to rhltable_lookup().",
  "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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            "upstream_fixed": "6.18.44"
          },
          "1:6.18.34-1+rpt1": {
            "linux_commit": "c8c7494100e99ee05b11aaa4f0588a223a63d1af",
            "upstream_version": "6.18.34",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.44"
          },
          "1:6.18.39-1+rpt1": {
            "linux_commit": "60ea684a8ace97bb0db1a16e20753bdd6ab371ff",
            "upstream_version": "6.18.39",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.44"
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-74565"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/4b549d32d34ee765527e63726bb1af984876e776"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/523c881661dde67efb44fce38c8eed50a72a57c1"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/1948e4f85b855618b5b9a27265f98d816f4cb7cb"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/63ba12b664a2cd3220ed43e22c717715f4cc2ae8"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/7d4789b58761d9d48d9b5f5e7e0a510c3bbfb3af"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f4f699790590bd0896c48a71e9232a65198f92f0"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-09-14T12:06:03Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The UAF is triggered only through local NETLINK_NETFILTER nftables configuration syscalls (NFT_MSG_NEWOBJ/GETOBJ/DELOBJ and rule/objref setup) that call nft_obj_lookup(); per kernel CNA guidance, nf_tables/netlink is Local, not network-reachable packet processing.\nAC:L - The attacker controls both sides of the race by running concurrent Netlink sockets\u2014one closing to fire nft_rcv_nl_event()/__nft_release_table() object teardown and another issuing object lookups/commits\u2014and can retry until the global rhltable collision-chain walk hits freed memory.\nPR:L - All nf_tables Netlink handlers are gated by netlink_net_capable(skb, CAP_NET_ADMIN) in nfnetlink_rcv(); CAP_NET_ADMIN is obtainable by an unprivileged user inside a user+network namespace (unshare -Urn), not requiring init-namespace root.\nUI:N - No victim interaction is required; exploitation is fully attacker-driven through their own nftables Netlink operations and socket close events without another user mounting, opening files, or taking any action.\nS:U - Impact is kernel heap use-after-free and potential local privilege escalation within the same kernel security authority; this is standard in-kernel memory corruption, not a distinct VM-guest-to-host or sandbox-boundary escape.\nC:H - nft_obj_lookup() holds rcu_read_lock and walks the global rhltable collision chain, dereferencing struct nft_object fields (key.table, ops, genmask) that nft_obj_destroy() may have already kfree'd, giving arbitrary kernel memory read potential from UAF.\nI:H - Immediate kfree after rhltable_remove without waiting for RCU readers enables classic slab UAF heap corruption that can be groomed into arbitrary kernel writes, control-flow hijacking, and local privilege escalation beyond a bounded or transient fault.\nA:H - Concurrent destruction via nft_rcv_nl_event() and active nft_obj_lookup() reliably provokes KASAN-class slab use-after-free kernel oops/panic during rhlist traversal; UAF is inherently crash-prone even when not fully weaponized for code execution."
    }
  }
}